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习题练习：Physics Unit12: Sound
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 70 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://51fly.win/test70.html
 作者: physics  发布日期: 2022-09-26 09:56    总分: 87分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月07日 09:59  切换到: 整卷模式

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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 it5y-s w z-b4cd9jni b/s a false statement?

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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 fastest thro5xl6 l tjj rtbzq*+2hli2( 5jlugh

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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 sorn;aw5z /c zh/q(lcx 3und in a steel rod?

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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 happens to the velocity of sound?h x7a3hcq)9 q2yb pa)g (Assume that allh3))qpa97ahq bx2ycg other factors remain constant.)

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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 a 200 Hz soczte)dtfc9v 3u 2)r;btsrxc0d;9d ( cund through air is9cs9 zc( tvu)tr)x;;ce3 dd0 d 2bfctr

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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 H c* 4+cc xz:tlzz7a4ehz sound, the wavelength of a 200 Hz sound in aiatlzc+ ch 7zx 44e:*zcr is

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequenciesc6g8.g 2l hvgq greater than 20,000 Hz are called

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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 lesrtvp* 3-syy3o. hlr6b3 5o pnfs than 20 Hz are called

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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 directig33e))z 7k u0xp sc-c;whtnxb d8.iufons. If you move to a point twice as far away from the source, the frequency of th;)fedx 3 ng7pwt x3 hck.u0cisb zu)-8e sound will be

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  For spherically diveryq rsdw6;0o rs we;gz.(g2ih9 ging waves, intensity is proportional to

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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 source r 6gk7ni3 oggxfs)t-a vhm3/6at a distance d from the source is I. What is the intensity at a distance 2dsakx6r 6hgi-/ft7 33mgon v g) from the source?

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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 in all d kn h8-vp0gn+ng2mxsf2*e ;wcirections. What happens to the intensity of the sound?e;xnw c2-*2 sk0f8+npnvhg gm It reduces to

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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 radi 33x9md;f7ym++9olb ogsu crgating equally in all directions. What happens to the in 7mgfo3lb;3c g9mx 9d+yrs+o utensity level of the sound? It drops by

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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 increases as a sound becomes louder?zo,g.sspbo4aegb * 4cn )v8.nx 3a3y l

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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 speaker emitting a pu:l c6slrq3n/ uabr y z46g(lpmt24ij /re tone. What characteristic of the sound increasescbl6z rn4qr3islm4/jg u6lt2yp(/: a?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" ofa(xf1hbpeuferq3 / kzk;* /rl n*et2ml(5sa) a musical note?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the "pitch" of7a -:) zlxx uz.6av(8s bsuicp a musical note?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When sound passes from a3lfcc5o ; tua4ir into water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displac+lcc2vibb*9 p a;s4z1tpn5+ (8upj z qht(nubement waves are

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider the standing wave on a guit nm 2v0zt184 ni2jrxro2leb9 par string and the sound wave generated by the guitar as a result of thpbevo42t j 82zlmrxnr i 219n0is vibration. What do these two waves have in common?

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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 is open at both enx9xk0t83 v,nw snj; bxqp+z4wds, there

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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 wavelengths of th lo*/r )c7nwvre three lowest tones producr vrl7nwo)/c*ed by this pipe?

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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 length L is 2oc :fbh u5gj5v)h-uf 400 Hz. Which one of the following frequencies will not resonate in the same pipu j5h 4:f hgfbv5c)-oue?

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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 length L is resoyn6a0mrea 1,gj8 *pny nating at its fundamental frequency. Which statement *ja e,ma 6 0ygr1nny8pis correct?

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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 at one end and closed at t) *ge.v9c/fnf6ez rflhe other, there

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider a closed pip, f8c b:vpe19toys9beg wccq7o57 ls,e of length L. What are the wavelengths of the three lowest95c7y87:et9 w b1osfsq pccvegb,ol , tones produced by this pipe?

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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 L8*h9j6buz aii is 200 Hz. Which of the fol ib*6zau98 jihlowing frequencies will not resonate in that pipe?

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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 resonating at iy+ 5+v 30i)wt-u4y6ycovgfz mz5e bv bts fundamental frequency. Which statement f 4cu+-mvi5g0zez)obv bvyy y65+t w3 is correct?

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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. zbyl:5apr2stt3zi /) Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound i)tsi zp/2:z y5lrab3ts 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?

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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 sh -cut9e386zk8up efs.0;byaj znzcl ,ould have

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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 beat frequency (zhzk.g a4tr)rs8gg)jp6n)n w- g+kp is heard. What happens to the beat frequency if the frequency of one of the tone-g g 4z.arjwpt(sgzgnk 8)h +)r6)kpns is increased?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift explshza;,9 gep)cains

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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 stationary observer. The fm ;bmxzuh5j)-l18le8 y k3 juwrequency heard by the observer byukwujh81l 5mm- 38jl)zxe;is

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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. The frequea dj5a258xi s2e eb8cvncy heard by the os5bdi8a2xaee 5cv8 j 2bserver is

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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 wh9lra(d +lqz :ill decrease by a factor+:l ha9zld(q r of:

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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 in air is 352 m/s. What -kh zw6q(7k (cpsrzw1is the airzc- hk(r(swq7 w61pzk temperature?

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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 qkj:r19s-h cewf,q- pc9x;1 imvkr8rsound in air at $0 \; ^{\circ}C$ to the speed at $100 \; ^{\circ}C$?

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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 o*)z uxw* t)ivof sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that *) )tuwv* xozireflected back the sound?

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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, and hear the echo in 4.00 s. The temperature ie h(fdl,uqp(1.rs4k is $0 \; ^{\circ}C$. How far away is the cliff?

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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 )fk5 p(u9akj qa flash of lightning, the distance to the lightning strike isqkufk )(jap9 5 about

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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 )iach+e*c+skn-4 .w n-wicw m a cliff on a day the temperature is $15 \; ^{\circ}C$. Approximately how far is the cliff from the observer?

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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?

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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 djca/ *3; duprueep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sound is 34cp*/jd;3 aruu 0 m/s.)

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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 frequency *yt*a zx*tf * ux2per.500 Hz is

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound traveling in airw-qi *p c3vcx*qu): f6 m+wkwz at $23 \; ^{\circ}C$ 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.

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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 level of a sound with inteno9pjo zq027l ksity $10^{-3} \; W/m^{2}$?

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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 ofx a46ni)mju:2bq8 fee a 70-dB sound?

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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 qm xl //7kiuc2of two sounds with intensity levels of 70 dB an/7lmcqik2/xu d 40 dB?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity level byzx(*l489skrdnb+y of0o h . sy 15 engines in a garage is 100 dB. What is the intensity level generated by one enflo(bs4o+*. 0yd8yn kh srx9zgine?

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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 6q ln, z6*xd.3pd)lj.tmutb3 s9z pu6 w.0 m from a source that is radiating equally in adzwpulzlmt q 3*6sx) 9bd,u .tnpj6 .3ll directions is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the power emitted by the source?

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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 m from a soud(,u sksz (jkau.k6w9 rce that is radiating equally in all w6ukz.9u dsk (as,(k jdirections is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the intensity level in 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 1 mW of power, which is assumed to 0twv)qf .lhw2oy..s fbe uniformly distributed in all directions. What is theq. lv2.of)wf0.w hs ty intensity level at a distance 5.00 m from the dog?

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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 di j)mdyvzom,0b h /q.q2stance 5.00 m from a barking dog. What would be the intenj,oqvdmm/0q .)b y z2hsity level if two identical dogs very close to each other are barking?

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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 the intensity level is 60 dB. hek. gajve p9:igpf* ;+*;upg What is the intensity lk;u:agfj+g p9p*hv *gi ;ep .eevel (in dB) at a point 2.0 m from the source? Assume that the source radiates equally in all directions.

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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 dmb. 06y5tf ersource is 95 dB. At what distance will it bee.60trf 5bmd y 75 dB?

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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 1b4wqm o,3x r 2;l7eld /jfckkziyl8i(f -. t-i200 Hz. What is the frequency of the fourth harmoni2i .-lmdik 7 xzlqyl4r;e8k3bj ,ctfwif/-( oc?

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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 01cna4 . tke*qe.zewi-b er+ekza (v *pipe is 900 Hz. What is the length of the p q*0 .ei tk1awbz+ke* -ea(e v.rnc4zeipe?

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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 400 Hz. e: ;-65es ajyukmxky / w;qa.gWhat is the frequency of the lowest tone that will resonate in an open :-yy a;sukjew5 ;gkameq6 x /.pipe of length 2L?

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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 a b xle*+jizpmy 22q:vq:l) z/zh ye*) slength of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second harmonic ye2z*q z)q+z 2*hl)ysl:v/:mjbi xpe?

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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 room wheripiz:s 0em0.0a kf z7ie the temperature is $20 \; ^{\circ}C$. What is the fundamental
frequency if the pipe is open at both ends?

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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 is 330 Hz. What is the fnfllj w8z uh/ifl9425 requency 2l/5nluihl94fj zf8w of the third harmonic?

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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 shortest pipe closed o-wkdy xhd/z / 066*qxkwt:fd on one end that will have a fundamental frequency of 60 Hz on o-/z*hk/ dqd6kxw twdf6y :0x a day when the velocity of sound is 340 m/s?

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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 where the temperaruexhuz . /3w1m l5ci4d9otkx1 h-lhrg-6e;pture is $20 \; ^{\circ}C$. What is the fundamental frequency if the pipe is closed at one end?

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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 a room where the tjscmkss+sq. nw .b/5) teee)*emperature is $20 \; ^{\circ}C$. What is the frequency of the second harmonic if the pipe is closed at one end?

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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 the speed of sound in air i dd :qr)0amv/ xli+op(c q(cu9n8 *qtqs 340 m/s. What is the fundamental frequen d+ 8/ox la nrqdc0m*cpq():9 qi(vqutcy?

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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 same lengtao xf7/6+r , s,kzl 69yanszj1-udkvoh: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundament/aklszrdku-9a6v fzxo 71 n ,+s6oj,y al frequency of the closed pipe?

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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- sk)wggrl3htbg) c 4; a frequency of 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 of the sources wouldcg b ktl-sg)w;r h)g34 hear no sound?

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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 frequency of 500 Hzhff kwcs) gj/4 h,)pl.. If the distance from a person to one speaker is 5.00 m and the person detects little or no sound, which of the following is a possible the distanch fhp swf,)) /.jl4cgke from the person to the other speaker? (The sound speed is 340 m/s.)

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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 4/v8t is t x:jrqyzc6(g6e;*ao40 Hz and 444 Hz. What is the beat frequency?

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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 t5d 3a4 etyzu0oo tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, ou 0ted 4a5y3zwhat is the frequency of the instrument?

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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 h7yq .e(gwyep.u2rl l 6orns are 6 m and 7 m respectively. Wha.elpr ywg2.eyl qu7(6t beat frequency is heard when the horns are sounded on a day when the velocity of sound is 340 m/s?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The corresponding violin string+ c4 nowftjprct,61c:hp.t 7f9usxdn 9. /tgts on two violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension of on ps1f jt96tnct:+ fth dwr cu.cn/.o7t94,xgpe of the strings would bring them to the same frequency?

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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 stationary 1000-Hz sound sourcev3s-nnd9wi y)t qb3l- at twice the speed of sound. The observer hears a fr9)swv - -ydbnnqi33tl equency of

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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 frequency of 1000 Hz) approaches am l.klo;c4 gke9vh v4g9r)q.d stationary observer at one-half the speed of sound. The observer hears a frequency of kql.9g hcgrel4vk; 4d.mvo 9)

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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*aivx/uon-vh1ow .3n speed of 30 m/s away from the source, what is the frequency heard by the observer? (The s vu3nvx1o -.o/*ahin wound speed is 340 m/s.)

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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 winqhe( dd;c 0,l8o j3m/s on a day when the speed of sound through air is 340 mcoq0 e(,;3jdih nw d8l/s. The car approaches and passes an observer who is standing along the roadside. What change of frequency does the observer hear?

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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 stationary observe 3ptnq 613l)h t(mjrcmr when a train approaches with a speed of 30 m/s. The frequency of the train horn is 6006qmlh p1rm )3ntj3(tc Hz and the speed of sound is 340 m/s.

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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. The train blows its 400-Hz whist 5 r7vs32peib:2:w . hotqmmgro1rio.le. Take the speed of sound to be 340 m/s. What frequency do you hea:m7 er3 r pstgvor15ioh:b.m2ow.q2 ir?

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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 km/h toward a (b0rz; j1g fhba) nc(rstationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frjzha 1c 0rfb;br(gn( )equency do you hear?

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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 train blows its 400-Hz 2s6vj , *stqfcwhistle. Take the speed of sound to t,6qj* svs cf2be 340 m/s. What frequency do you hear?

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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 9vk6p1ijqp7(phckg7 a nnv3zb; yu r,*t)q7i120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to z7 k,pk p ig7pa 9hnjvu ;iy731q ()*6tcrvnbqbe 340 m/s. What is the actual frequency of the whistle?

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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.-mp rrl f71t)i Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train with rli1 tf mpr)-7a speed of 30.0 m/s?

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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. Assume *r: *f7eroylr the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the *:7of rlrrey*observer is approaching the train with a speed of 30.0 m/s?

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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 speed of an object. A 40-kHz g 4pch -t3e.ujsignal is sent out, and a 42-kHz signal is returned. Assume the speep.3g- jt hcu4ed of sound is 345 m/s. How fast is the object moving?

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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 a a3k/,s oh0f(l(gzngs ircraft is $60^{\circ}$. What is the Mach number of the aircraft?

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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 nhupyn.h(9. cthe half-angle of the conical shock wave formed?(u.c9n h.hpny

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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 r,vas 3j4d(ym,tdh* b with a Mach number of 1v,3s b,hd4*dar (mtjy .05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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