Physics Unit12: Sound - 51fly国际课程 (51fly.win)

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1#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following is az.ot5(mnn gt(1im3 m u false statement?

A. Sound waves are longitudinal pressure waves.

B. Sound can travel through a vacuum.

C. Light travels very much faster than sound.

D. The transverse waves on a vibrating string are different from sound waves.

E. "Pitch" (in music) and frequency have approximately the same meaning.

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In general, sound is conducted faste xb 0.xd8ii6amcu-:test through

A. gases.

B. liquids.

C. solids.

D. a vacuum.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the speed of sound)ugh4a r + ui4;zzxumwdj d;/3 in a steel rod?

A. 1500 m/s

B. 3000 m/s

C. 5000 m/s

D. 8000 m/s

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

As the temperature of the air increases, what b0 rxbx,koe.o+h h k:a7u/ o0chappens to the velocity of sound? (Assum07uachx+ kbexr/, k o.o0:hobe that all other factors remain constant.)

A. It increases.

B. It decreases.

C. It does not change.

D. It increases when atmospheric pressure is high and decreases when the pressure is low.

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to the velocity of a 400 Hz sound, the velocity of;8y v,,uz k; slgtpdw1 a 200 Hz sound through air k vt;d8p;1,wgu,lsyz is

A. twice as great.

B. the same.

C. one-half as great.

D. none of the above

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to the wavelength of a 400 Hz sound, the wavelength of a 200 Hb)1 q 7q6xvtdmz sound in aivt) xd mqb716qr is

A. twice as long.

B. the same.

C. one-half as long.

D. none of the above

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Sound vibrations with frequencies greater than 20p );wlx4x*, wo zphcg(,000 Hz are called

A. infrasonics.

B. ultrasonics.

C. supersonics.

D. none of the above

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Sound vibrations with frequency less t 31.njhun xlq27mr3fs/b whf9han 20 Hz are called

A. infrasonics.

B. ultrasonics.

C. supersonics.

D. none of the above

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Suppose that a sound source is emitting waves uniformly in all directions. dig * l2,ybnh-;mosmfo; 6q32q fdk)l If you move to a point twice as far away from the source,g; q; lkom ly2sf i*32f 6h,o-dqn)mdb the frequency of the sound will be

A. unchanged.

B. half as great.

C. one-fourth as great.

D. twice as great.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

For spherically diverging waves, intensixk;tc n2r h je;lbi/9 l4x60mfty is proportional to

A. $R^2$

B. $R$

C. $1/R$

D. $1/R^2$

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The intensity of a point 1ucr( hy -xggoqy w h. 0vk3p85(o,ajasource at a distance d from the source is I. What is the intensity at a distance 2d from the yj x-o58coywh,vuk(g3hrq p.a(0a 1g source?

A. $4 \; I$

B. $2 \; I$

C. $I/2$

D. $I/4$

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You double your distance from a sound source that is radiating equally inm )c/vdhrog,**0wp zu all directions. W /rc *g0uwv p,do*mzh)hat happens to the intensity of the sound? It reduces to

A. one-half its original value.

B. one-fourth its original value.

C. one-sixteenth its original value.

D. none of the above

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You double your distance from a sound source that is radiating equally in allcopb,0h ) 4ly 7tjh*9ib2kn*vwizo-d directions. What happens to the intensity level of the sound? It drops kbp24oic*hti)*on 0w7d9yvbzh l ,j- by

A. 2 dB

B. 3 dB

C. 6 dB

D. 8 dB

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following increa hi87y:kqyqca 9*:;k apdtk 1nses as a sound becomes louder?

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You move slowly toward a speakec4uqc -otn:a o t h3e;7gaww9.r emitting a pure tone. What characteristic of th aw7c9oenct ;wua-hot q34:.ge sound increases?

A. frequency

B. amplitude

C. wavelength

D. period

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What determines "loudness" of a musical ,+e4to z4d so;sahudv.ff ;o9;y 6rkwnote?

A. frequency

B. velocity

C. phase

D. amplitude

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What determines the ".off5n*7 rs chpitch" of a musical note?

A. amplitude

B. wavelength

C. frequency

D. phase

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When sound passes fromtq wod0 l9 z.1)eqouc*nk3,zh air into water

A. its wavelength does not change.

B. its frequency does not change.

C. its velocity does not change.

D. all of the above

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Pressure and displacemni : z(n(nkac.1t f1cuent waves are

A. in phase.

B. $45^{\circ}$ out of phase.

C. $90^{\circ}$ out of phase.

D. $180^{\circ}$ out of phase.

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider the standing wavelhs9dgo:3 fw6 on a guitar string and the sound wave generated by the gui 6f: 3hld9gwsotar as a result of this vibration. What do these two waves have in common?

A. They have the same wavelength.

B. They have the same velocity.

C. They have the same frequency.

D. More than one of the above is true.

E. None of the above is true.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a resonating pipe which isz9 a( v/eed8 (w,:-iumsdmv ur open at both ends, there

A. are displacement nodes at each end.

B. are displacement antinodes at each end.

C. is a displacement node at one end and a displacement antinode at the other end.

D. none of the above

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider an open pipe of length L. What are the wavel4vz-hj5*u rdb engths of the three lowest tonhu 45rdvbjz *-es produced by this pipe?

A. 4L, 2L, L

B. 2L, L, L/2

C. 2L, L, 2L/3

D. 4L, 4L/3, 4L/5

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The lowest tone to resonate in an open pipe of w:v 0ko)9nrlcmm+j( t 4svl4elength L is 200 Hz. Which one of the following frequencies will not resonate in the 9wsl0+ )kvomcmel:t44rnvj( same pipe?

A. $400 \; Hz$

B. $600 \; Hz$

C. $800 \; Hz$

D. $900 \; Hz$

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An open pipe of lengtdva 21t3yfsc/ eqfk.wmy) d8+h L is resonating at its fundamental frequency. Which statement is corre)y/ de8+1tqw av d2fyc s.kfm3ct?

A. The wavelength is 2L and there is a displacement node at the pipe's midpoint.

B. The wavelength is 2L and there is a displacement antinode at the pipe's midpoint.

C. The wavelength is L and there is a displacement node at the pipe's midpoint.

D. The wavelength is L and there is a displacement antinode at the pipe's midpoint.

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a resonating pipe which is open atc6+ -)rtgtca.c8o0l /y exmcs one end and closed at the other, there

A. are displacement nodes at each end.

B. are displacement antinodes at each end.

C. is a displacement node at the open end and a displacement antinode at the closed end.

D. is a displacement node at the closed end and a displacement antinode at the open end.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider a closed pipe of length L. What are the wavelengths of the three low,sf:fqvfcr d444 iuy0. (qihk est tonhqyfi(i:. qrf,0 4 4vkfucds4es produced by this pipe?

A. 4L, 2L, L

B. 2L, L, L/2

C. 2L, L, 2L/3

D. 4L, 4L/3, 4L/5

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The lowest tone to resonate in a closed pipe of length L is 200 Hz.zyn:2l7zc*sy1qpliq o0n mtr6:s h;( Which of the following frequencies will not r:hi( *sq6y7n0 z q2zltl; c:ynsmp o1resonate in that pipe?

A. $400 \; Hz$

B. $600 \; Hz$

C. $1000 \; Hz$

D. $1400 \; Hz$

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A pipe of length L closed at one end is rexq6 rmfimm ;u1, c8jiilwd/rbk*h051 q7fop*sonating at its fundamental frequency. Which statement is correc5o7iq *f m,l1q1i *ipmcwf6 xb kj08 /hu;rrmdt?

A. The wavelength is 4L and there is a displacement node at the pipe's open end.

B. The wavelength is 4L and there is a displacement antinode at the pipe's open end.

C. The wavelength is L and there is a displacement node at the pipe's open end.

D. The wavelength is L and there is a displacement antinode at the pipe's open end.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A person stands between two speakers driven by the same source. Each spe2zzx8+q ub7mb aker produces a tone with a frequency of 200 Hz on a day when the speed of sound is q um8b+bx2zz7 330 m/s. The person is
1.65 m from one speaker and 4.95 m from the other. What type of interference does the person sense?

A. constructive

B. destructive

C. both constructive and destructive

D. neither constructive nor destructive

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In order to produce beats, the two sound waves sho ;dmeue7bxw f3g(3b )t61 dymguld have

A. the same amplitude.

B. slightly different amplitudes.

C. the same frequency.

D. slightly different frequencies.

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two pure tones are sounded together and a particular bea7z l+, ed1zr pujbei, )la7td6t frequency is heard. What happensbi,a rzz utpd e1l7j),ld67e+ to the beat frequency if the frequency of one of the tones is increased?

A. It increases.

B. It decreases.

C. It does not change.

D. It could either increase or decrease.

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The Doppler shift extct 3r2( v +,lp*bb vw3xezs)aplains

A. why the siren on a police car changes its pitch as it races past us.

B. why a sound grows quieter as we move away from the source.

C. how sonar works.

D. the phenomenon of beats.

E. why it is that our hearing is best near 3000 Hz.

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A sound source approaches a stationar ;gdwys 0fyzty kxhv i344d0nf9)wl,;y observer. The frequency heard by the obserg, k0 f)0 y44lv39;hn;ws tyiwx dzfdyver is

A. higher than the source.

B. lower than the source.

C. the same as that of the source.

D. equal to zero.

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A sound source departs from a stationary observer. T:x4ab qn5eh d m:o*aw:he frequency heard by the observeradn: :w 5*bhqe4xa:o m is

A. higher than the source.

B. lower than the source.

C. the same as that of the source.

D. equal to zero.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If a jet plane were to double its MACH-speed, its half-angle will dec miqp6fz-rdhnd 8d .6 h5u47whrease by a facto65drifd hh -.u74hw8 z6qpmdnr of:

A. 1/2

B. 2

C. $\sin^{-1} (1/2)$

D. none of the above

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The speed of an ultrasonic sound of frequency 45 kHz ib h1, q ntwf0v2jx,u,cn air is 352 m/s. What is the air temp,jwh,0,btuvq21 fxn cerature?

A. $33 \; ^{\circ}C$

B. $34 \; ^{\circ}C$

C. $35 \; ^{\circ}C$

D. $36 \; ^{\circ}C$

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the ratio of the speed of sop9;kobmwhu7 1jgoun) na94a3und in air at $0 \; ^{\circ}C$ to the speed at $100 \; ^{\circ}C$?

A. 0.75

B. 0.85

C. 0.95

D. 1.1

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

On a day when the speed of sound dj onr v3pt:lc0c+ y.v+, g0edc rb*o,in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How c, c++ .,jgore3tvy*0n:d cplbr0 ovdfar away was the object that reflected back the sound?

A. $4.25 \; m$

B. $8.50 \; m$

C. $0.425 \; m$

D. $0.850 \; m$

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You shout at a cliff, an0fgo-+n 5 mjfrd hear the echo in 4.00 s. The temperature is $0 \; ^{\circ}C$. How far away is the cliff?

A. $662 \; m$

B. $680 \; m$

C. $1320 \; m$

D. $1760 \; m$

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you hear thunder 5.0 s after seeing a flash of light+crw/kyu(n5z m izo*/ 02n bocning, the distance to thew(c ok025n *y i/nzcuo/z+ brm lightning strike is about

A. 600 m

B. 1200 m

C. 1700 m

D. 2200 m

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An echo is heard 2.0 s from a cli (auk-9/q)no m4as ai7 *byno q1vrwj(ff on a day the temperature is $15 \; ^{\circ}C$. Approximately how far is the cliff from the observer?

A. $85 \; m$

B. $170 \; m$

C. $340 \; m$

D. $680 \; m$

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

On a $30 \; ^{\circ}C$ day, there is an explosion. The sound is heard 3.4 s after seeing the flash. How far away was the explosion?

A. $0.10 \; km$

B. $0.75 \; km$

C. $1.2 \; km$

D. $1.5 \; km$

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You drop a stone into a deep well and hear the splash 2.5 s laterlb l -b33r/ky.;opu.vsxmo )r. How deep is the well? (Ignore air resistance, and assume the velocity of soxsr-)uvb .r/ybk;llmop3o 3. und is 340 m/s.)

A. $25 \; m$

B. $27 \; m$

C. $29 \; m$

D. $31 \; m$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The wavelength in air of a sound wave of 4,mdw7ea.r1uvx, fo n z r-cu.frequency 500 Hz is

A. 0.69 m

B. 0.75 m

C. 1.5 m

D. 1.8 m

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Sound traveling in air o2a*wk y w,y 8yo0hel:k5te-t6 m2w fmat $23 \; ^{\circ}C$ enters a cold front where the air temperature is $2 \; ^{\circ}C$. If the sound frequency is 1500 Hz, determine the wavelength in the warmer air and in the colder air.

A. 0.230 m, 0.221 m

B. 0.221 m, 0.230 m

C. 0.321 m, 0.254 m

D. 0.254 m, 0.321 m

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the intensity llutg g8y :(6bvevel of a sound with intensity $10^{-3} \; W/m^{2}$?

A. $30 \; dB$

B. $60 \; dB$

C. $90 \; dB$

D. $96 \; dB$

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the intensity of a 70-dB + vh diz-io5s94e oo+o ypp/,ysound?

A. $10^{-4} \; W/m^{2}$

B. $10^{-5} \; W/m^{2}$

C. $10^{-6} \; W/m^{2}$

D. $10^{-7} \; W/m^{2}$

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the ratio of the intensities of two soundh:tj ;qxw. -*s lr3qma akcnea ax:g:+w8u*2vs with intensity levels of 70 dB and 40c:sla8k qj aamen ar 3 w*2gqt::.huxv*w x-+; dB?

A. 10:1

B. 100:1

C. 1000:1

D. 10,000:1

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The intensity level by 15 engines in a garageb 5hh2e1:f out;t lx,e is 100 dB. What is the intensity b f5el tx ;hht:,2oue1level generated by one engine?

A. $67 \; dB$

B. $13 \; dB$

C. $44 \; dB$

D. $88 \; dB$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The intensity at a distance of 6.0 m from a sgwk*r1p d(whaj/.ew cu*s (4vource that is radiating equally in all directionw*crejgdkvhpasw1 w *u((4/. s is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the power emitted by the source?

A. $2.1 \times 10^{-8} \; W$

B. $2.7 \times 10^{-7} \; W$

C. $2.1 \times 10^{-6} \; W$

D. $2.7 \times 10^{-5} \; W$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The intensity at a distance of 6.0 gqdy:+mr*p(dm from a source that is radiating equally in ap:dqy mrd +g(*ll directions is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the intensity level in dB?

A. $18 \; dB$

B. $23 \; dB$

C. $28 \; dB$

D. $32 \; dB$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A barking dog delivers about -n j) hgl6w kyyami/5kil2j(.1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at ajlj 5)(li/k wmy-gy2ki h6an. distance 5.00 m from the dog?

A. $61 \; dB$

B. $63 \; dB$

C. $65 \; dB$

D. $68 \; dB$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The intensity level is 65 dB at a distance 5.00 m from a barking dog. n*vol 2( lqm-oWhat would be the inte( m *voll-o2qnnsity level if two identical dogs very close to each other are barking?

A. $65 \; dB$

B. $68 \; dB$

C. $130 \; dB$

D. $136 \; dB$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At a distance of 15 m from a sound source (e3oua*pc 0xlthe intensity level is 60 dB. What is the intensity level(c u a3l0xo*ep (in dB) at a point 2.0 m from the source? Assume that the source radiates equally in all directions.

A. $55.7 \; dB$

B. $57.5 \; dB$

C. $75.5 \; dB$

D. $77.5 \; dB$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The sound intensity level 5.0 m from a point source is 95 dB. At c.mfmup ud l/ :b)f-s3what distance will it be 75 :-/mf3uubsc )m .dlfp dB?

A. $25 \; m$

B. $50 \; m$

C. $75 \; m$

D. $225 \; m$

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The third harmonic of a complex tone has a frequency of 1200 Hz. Wha)874 ah ohmqat)lekxt co62;kt is the frequency of 74eomo 8h qk) x26cthka;lta) the fourth harmonic?

A. $400 \; Hz$

B. $900 \; Hz$

C. $1600 \; Hz$

D. $4800 \; Hz$

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The frequency of the third harmonic of an open pipe is 900 Hz. What is the lenwpt / t2.v4itmx 1ce9ngth of the pipewexti . 4/v1tmpcnt29?

A. $0.189 \; m$

B. $0.283 \; m$

C. $0.567 \; m$

D. $1.13 \; m$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The lowest tone to resonate in an open pipe of length L is )r)st)tzmd: -bfj3 v8cef/dh 400 Hz. What is the frequency of the lowest tone that will zm)crt fev8 f bd)t- dhj3/):sresonate in an open pipe of length 2L?

A. $800 \; Hz$

B. $200 \; Hz$

C. $1600 \; Hz$

D. $100 \; Hz$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An organ pipe open at both ends has 5z9r0 ywhea1ca length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second harmonic1 9rw aey5z0hc?

A. $213 \; Hz$

B. $425 \; Hz$

C. $638 \; Hz$

D. $850 \; Hz$

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.00-m long pipe is in a room8sny(( az7 g yj0: tkfws0sp7n where the temperature is $20 \; ^{\circ}C$. What is the fundamental
frequency if the pipe is open at both ends?

A. $57 \; Hz$

B. $114 \; Hz$

C. $29 \; Hz$

D. none of the above

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The fundamental frequency in a pipe closed at one end i) u ,yc+essay1y)i)v:rc mto-s 330 Hz. What is the frequency of,ycev-yci :o))m s1t a+s)r yu the third harmonic?

A. $110 \; Hz$

B. $220 \; Hz$

C. $660 \; Hz$

D. $990 \; Hz$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the length of the+x *h*3fbdzoy )8y dqt shortest pipe closed on one end that will have a fundamental frequency of*bhf8zd3)yt x o+ *dyq 60 Hz on a day when the velocity of sound is 340 m/s?

A. $1.24 \; m$

B. $1.42 \; m$

C. $2.14 \; m$

D. $4.12 \; m$

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.00-m long pipe is in a room ;( v3aqa0oukpgas-1a where the temperature is $20 \; ^{\circ}C$. What is the fundamental frequency if the pipe is closed at one end?

A. $57 \; Hz$

B. $114 \; Hz$

C. $29 \; Hz$

D. none of the above

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.00-m long pipe is in vd 8mw-o1 (rlta room where the temperature is $20 \; ^{\circ}C$. What is the frequency of the second harmonic if the pipe is closed at one end?

A. $57 \; Hz$

B. $114 \; Hz$

C. $29 \; Hz$

D. none of the above

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A closed organ pipe of length 0.75 m is played when oz mmxw1p,y: ,the speed of sound in air is 340 m/s. What is the fuw: mz,1ypomx,ndamental frequency?

A. $57 \; Hz$

B. $113 \; Hz$

C. $170 \; Hz$

D. $227 \; Hz$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two pipes of the samef7 sse9- +jrwlu xb;k/ 5zhl(x length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, whatsxrswj z+-l 9k;fbu5(h /el7x is the fundamental frequency of the closed pipe?

A. $150 \; Hz$

B. $300 \; Hz$

C. $450 \; Hz$

D. $600 \; Hz$

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two adjacent sources each emit a frequency lvfqwugy,i i+d(s4i :2d y8+rof 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in front yui:lsd(+i,4ig8 q2d wrf+vy of the sources would hear no sound?

A. $0.123 \; m$

B. $0.321 \; m$

C. $0.213 \; m$

D. $0.312 \; m$

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two speakers are placed side by side and driven by the same frequencyvvyj 7r-ne9 mta )wn--(schk2 of 500 Hz. If the distance from a person t2--a crsv7(n n -ey9t k)hmvjwo one speaker is 5.00 m and the person detects little or no sound, which of the following is a possible the distance from the person to the other speaker? (The sound speed is 340 m/s.)

A. $7.7 \; m$

B. $8.1 \; m$

C. $8.4 \; m$

D. $9.1 \; m$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two tunes have frequencies of 440 Hz/s6b;d m)/1aftphbgz and 444 Hz. What is the beat frequency?

A. $4 \; Hz$

B. $442 \; Hz$

C. $884 \; Hz$

D. none of the above

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A music tuner uses a 550-Hz tuning fork to tune the frequency befgq-:wp2a2y xq/ d84 loli(of a musical instrument. If:ldqf4ae 2wx -(l /bopqi2g 8y the tuner hears a beat frequency of 2 Hz, what is the frequency of the instrument?

A. It must be 552 Hz.

B. It must be 548 Hz.

C. It could be either 552 Hz or 548 Hz.

D. It is neither 552 Hz or 548 Hz.

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The wavelengths of the sounds produced by two horns are 6 fv21r6 7-dxd v4ffdfgm and 7 m respectively. What beat frequency is heard4r1f xf6g-dvfd7d v2f when the horns are sounded on a day when the velocity of sound is 340 m/s?

A. $5 \; Hz$

B. $6 \; Hz$

C. $7 \; Hz$

D. $8 \; Hz$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The corresponding violin strings on two violins in an orchestrarid vvg z ,f(:i16qmcs f3-.uk are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage chcr3,g. q(:i muvf-k sdv16iz fange in the tension of one of the strings would bring them to the same frequency?

A. 0.2%

B. 0.4%

C. 0.6%

D. 0.8%

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An observer approaches a s-:aq*lycbk 8 vtationary 1000-Hz sound source at twice the speed of sound. The observer hears a freq 8kcy*av bl:q-uency of

A. 4000 Hz.

B. 2000 Hz.

C. 500 Hz.

D. none of the above

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A sound source (normal frm o(+d. meev5+x5kbxuequency of 1000 Hz) approaches a stationary observer at one-half the speed k +(mm5x5.+uexe v odbof sound. The observer hears a frequency of

A. 2000 Hz.

B. 500 Hz.

C. 1500 Hz.

D. none of the above

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A sound has a frequency of 1000 Hz. If a listener moves with a speed of 30 m/sp+b;qz-oj,fsoht - ic73w: p v away from the source, what is the frequency heard by the observer? (The sound speed i3 tqpvjbf- +o7ow,c z-sp:h; is 340 m/s.)

A. $912 \; Hz$

B. $919 \; Hz$

C. $1000 \; Hz$

D. $1090 \; Hz$

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A police car has an 800-Hz siren. It is traveling at 35 m/s on a day when the+9sdqinvde 5guu t..3 speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadside. What change of frequency does the observer hea gtd5.q. e+su3i9dvunr?

A. zero

B. $82 \; HZ$

C. $166 \; Hz$

D. $249 \; Hz$

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the frequency heard by a stati6zx 6l*9k8n6d ql u6v; tblwzaonary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the spee6abqlzwv l 96 lu;td 6z6*8kxnd of sound is 340 m/s.

A. $551 \; Hz$

B. $600 \; Hz$

C. $653 \; Hz$

D. $658 \; Hz$

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A train is traveling toward you at 120 km/h. Thedh14 6vqfgn)mzic*:o train blows its 400-Hz whistle. Take the speed of sound to od 1gzv ch :mi*qf)n64be 340 m/s. What frequency do you hear?

A. $444 \; Hz$

B. $439 \; Hz$

C. $364 \; Hz$

D. $361 \; Hz$

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You are moving at 120 kmbk.h(gi pd r.2/h toward a stationary train. The train blows its 400-Hz whistle. Ta(dhir. . kg2bpke the speed of sound to be 340 m/s. What frequency do you hear?

A. $444 \; Hz$

B. $439 \; Hz$

C. $364 \; Hz$

D. $361 \; Hz$

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A train is traveling away from you at 120 km/h. The fki 2v;; +bprgn-nsa8train blows its 400-Hz whistle. Take the sp ngbk ir +san2f-8vp;;eed of sound to be 340 m/s. What frequency do you hear?

A. $444 \; Hz$

B. $439 \; Hz$

C. $364 \; Hz$

D. $361 \; Hz$

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A train is traveling away from you at 120 kk rwo4m9*3t3ud bd8d8y )droj m/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of so* wrd98oym3dkodu 3)jdt4b 8 rund to be 340 m/s. What is the actual frequency of the whistle?

A. $444 \; Hz$

B. $439 \; Hz$

C. $364 \; Hz$

D. $361 \; Hz$

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The frequency of a train horn is 500 Hz. Assume thax- +)9 /oiz uuwkchr5e speed of sound in air is 340 m/s. Whoh9-uw iacz 5 +rx)u/kat is the frequency heard by an observer if the observer is moving away from the train with a speed of 30.0 m/s?

A. $500 \; Hz$

B. $456 \; Hz$

C. $548 \; Hz$

D. none of the above

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The frequency of a train horn is 500 Hz. Ascv/m2;vr(/gw9gp zwz sume the speed of sound in air is 340 m/s2/ ;g9 c mwgzvwrpz/v(. What is the frequency heard by an observer if the observer is approaching the train with a speed of 30.0 m/s?

A. $456 \; Hz$

B. $500 \; Hz$

C. $544 \; Hz$

D. none of the above

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Sonar is used to determine the s6s m4d,b.al :ga-vaq opeed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound iso l:s,mva qbagda6 .-4 345 m/s. How fast is the object moving?

A. 6.9 m/s

B. 8.4 m/s

C. 331 m/s

D. 347 m/s

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The half angle of the conical shock wave produced by a supersonic 5k libk7-+rg yaircraft is $60^{\circ}$. What is the Mach number of the aircraft?

A. 0.87

B. 1.2

C. 1.7

D. 2.0

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A jet flies at a speed of Mach 1.4. What is the half-angle 7:8x vqc7do y(d lma+lof the conical shock wavddv yxa8 7mo+q(ll:7ce formed?

A. $30^{\circ}$

B. $36^{\circ}$

C. $44^{\circ}$

D. $46^{\circ}$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The Concord airplane flies from the United States to Europe with 62qeiv d 2xgicw : f-zuznz3wi:. t3-pa Mach number of 1.05 where the air temperature is pizx wnc3 -3tvz i2f-ud6 gqei.z::w2$5.0 \; ^{\circ}C$. What is the speed of the plane?

A. 334 m/s

B. 337 m/s

C. 351 m/s

D. 359 m/s

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