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习题练习：Physics Unit12: Sound
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 70，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://51fly.win/test70.html  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。
 作者: physics  发布日期: 2022-09-26 09:56    总分: 87分  得分: _____________

答题人: 游客未登录  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 is a faof;wqo. +ck *13 h ux,jg/nygsp(zw8dlse 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 through pd4/g( hcf j,)n)sehw

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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 in a stpnm l( ;6,. hmq6vmcnteel 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 od1m;fsga, )pb + prmx*f the air increases, what happens to the velocity of sound? (Assume that all other factdfms1)a+rpp; g m*b,xors 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:p4ds hd1 +ptxh l1lp2zaxs/4 Hz sound through aip /d1ap pllhsz21 :h4sd+x xt4r is

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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 soungo76c8rhvik9 dgs3 p +sd,a gqc)e:nq ;r5.vhd, the wavelength of a 200 Hz sound in ggdaoqq g;c:sev3r8c .r9)5kdh+ vpih n7s ,6air 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 fiv:esao rx4fre+ umr5i 0*u55 requencies 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 less than 20 Hz are calle +ypeu/zrg+pt50);ejg9n exxa f v6;fd

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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 uni1vapa e;k id)u6 4zo7h:: hof/ cmeh 8goa0(coformly in all directions. If you move to a point twice as far away from the source, the frequency oo8 )p(:d /aaoho g:6 ok7c0f 4i1uhazhm ;evcef the 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 diverging waves, intensity is prfnpk:-ie1 i4 wtxv *4soportional 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 at a dl 2hs4q q1gz+ jzkx2*uistance d from the source is I. What is thlgq2+zxqzu21*s4j k he intensity at a distance 2d 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 fromd mck: u2g* kdlkeg2)) a sound source that is radiating equally in all directuk:m dglc k*g)k)e2d 2ions. What happens to the intensity of the sound? 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 radiating equally in * gb(b/e.7f m2irkwsm gui o/.all directions. What happensfo r./bmkiub 2g/ .(mi7wegs* to the intensity 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 lou w6/bm dasc0 m( mbawr-h m5n-t9ww62ader?

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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 pure tone. What cl xv aa n 04gq0kdxt0s5/3e;blharacteristic of the so gx5 xa0a0e;dlsn b3/0q4lkvtund increases?

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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 musn l21mo8yo .fd; k- emt5sl9liical 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"jkqyf om63d,jfx/e sa9y6y 6b l3 j(1x of 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 air into ,k8txa9bv;7 ok1 zugx water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wav fupf5e /g/bdpd+ vvwsi y+fk.0-0 lx/es 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 1/vblll-*d/y0;yn2spqfd w t a guitar string and the sound wave generated by the gufs w qdt2l nl/bp vd1/;y*-yl0itar as a result of this 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 ogc ax5x5bd0l* pen at both ends, 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 bte g)uyt k(2e04t -g.t nh7 8*jnfpnfare the wavelengths of the three lowest tones prg fj0t 8t2etnf .yu)- 4tne*gk7nbp(h oduced 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 200 Hz. w cwjgm +1ykp(1+-dc q Which one of the following frequencies will not g1wkyj+qc -w dp+1m c(resonate in the same pipe?

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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 resonating at its fundpq :k: 8eo 50ishpfk o+xft6-xamental frequency. Which statem o6 ofkfxk q:5 i+8p:-xpes0thent is 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 the other, ther: 7lw:wq jjo5dgvg/ox06 g)pce

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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 otqm- +ktc x/bz0r/p6i3fe( ur sv3:t of the three lowest tones produced x3 pt:q(ttv 3c-fe/m6 k0+ z brsi/ruoby 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 lengt-17)cvlhmh,c yq, +ktde 3 mulh L is 200 Hz. Which of the followinl t e)y,md+cqk7lv h1-mc3hu,g 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 resona - bm/dtz f .-og9b(rj;j(whxt ce.2wnting at its fundamental frequency. Which statemx ej(-d2- wb/oc(wtn; hz.fbmjr t9. gent 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 sourcewv(.ff,tfuf6 . Each speaker produces a tone with a frequency of 200 Hz on a day when the speed owff u6t, f(.fvf sound is 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 twodcgfh 4p6yp6 hrt(: )v sound waves should 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 tot ok/v;dxry4db8,7 wsgether and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones is incre;wrto 8/x bddy7,svk4ased?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift exv3 3dn0z9wl ok)va fn5plains

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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 frequency heard by the ou+lh-w)w :y;zbk6u dmbserverm-yl b;w6uw) u+kd hz: 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. Theo. hqeb q1k+v1 frequency heard by the oo .q+kehq1b 1vbserver 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 will decrea iwle: g((vys9se by a factor of:s(lv( w gi9y:e

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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 ox q)l7 se m+enb95 wc5sgk1dz:f frequency 45 kHz in air is 352 m/s. What is the air tempera7ng 59ld):eb s1e5qz+ws xck mture?

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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 or/cdjw k*,n t(f sound 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 ofri(ci z c;/kk82 j dsqbvr36n; sound in air is 340 m/s, a bat emits a shriek whose echo 8 d(2jks;3 ;c rckvirq6/nzibreaches it 0.0250 s later. How far away was the object that reflected 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 4.8 ihqsezt5atlj x; )b)j1+ 1en00 s. The temperature 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 a flash of lightning, thenpy. qci-cr.v q0 41)ie .a6asu yimc) distance to the lightni4cn c6y.-)m..i0a)u ipay s rqiqcev1ng strike is 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 fr 5-hoqz;ref9yom 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 deep well an8qhg qt*9fl06aeq/1hmdc b)kd hear the splash 2.5 s later. How deep is the well?e1h8f 96 d)tlkgaqhq mc/q*b0 (Ignore air resistance, and assume the velocity of sound is 340 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 50l.10 yfzx(jjc -uu l3j0 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 air at eegt .63 b 2pog.f:ycr8 ;uo bxf8b8dw$23 \; ^{\circ}C$ 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 f.9rh 0lc9r8 zn9 -jcphwgx7eintensity $10^{-3} \; W/m^{2}$?

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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 of a ) (8sn )uqahbq70-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 of two sounds with 9ezc,w w1-,5i xbqmb yintensity levels of 70 dB and cwe i,95byq1wbxz ,- m40 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 by 15 engines in a garag oyoj td::a:e6 sd0u:ue is 100 dB. What is the intensity levee:d:u od 0u6tyso:j:al generated by one engine?

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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 source that is radiating equa3lu- 3ixxg2nodb+a)illy in ab a3gxo- i3n 2idlx)+ull 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 source that is radiating equi2eyj5w)2l1zo sxg9j+k6m g s ally in azg )xojwm26jsk92e15ly g s+i ll directions 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 be uniformly db,drn 1;pi+ xnck:0u fistribute0n r+b1cpnkuxdi ; :f,d in all directions. What is the 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 distance 5.00 m from a barking euf pd5z0qy*09dg lm 7ig4: vwdog. What would be the intensity level ifwdi u gz7ed * 0094:vmfq5pgly 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 int h ( gx.5;xrhhjho 7w,5e8wmokensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equally in all d (gxr5h;heo m5o h87wxkh j.w,irections.

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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 95ua agp)zb):/j v0pzfbh 54dq . dB. At what distance will z./adv5phbbqa))04fg zju :p it be 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 12s11/ 9 *q3myveszgpzb v j3,hq00 Hz. What is the frequency of the fourtze9 3p3mhb s v*sjgz1qyq/1,vh harmonic?

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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. Whatojf:b;9pk)s m is the length of th9opb)ms;f kj :e pipe?

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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 400n9 , 2ltvptqsu ,j5eqrrun; j1 xas28, Hz. What is the frequency of the lowest tone that will resonatu, ; j,q2rvtennl5ur,jat198 p s2xqse in an open 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 length of 0.80 c)zmammy (il jij29+6m. If the velocity of sound in air ij im6maz9lj y)+c2i(m s 340 m/s, what is the frequency of the second harmonic?

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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 where the temp67fv n wtnqj(e 1/g/rferature 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 ioq 9gsv zo:3s(s the frq:( gso9ov zs3equency 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 clos4beox7h,u29 q muvmx4 ed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of soundob,4 7mvhu92em xqu4x 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 wherwd vy)g ffb+t5c- 9j.te the temperature 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 wheuuna;2c) 9p u : 2ghfiyu/ke nmbc 2zy,1xlj19re the temperature 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 xj7ildkj2w,jv zay1p 64/s8owhen the speed of sound in air is 340 m/s. What is tvlz6jk xp8o j 7ia j1/ydw24,she fundamental frequency?

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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 samelvgaur r5;.z 3 length: 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 fundamental frequency of the a;vl grrz35.u 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 a frequency ji*71hm +knnv8xqt3w 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 obsx h+ji1kq8nm3 wvtn7 *erver in front of the sources would 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 si,afdx)p+ )j i ,feng.p2jm e6qde by side and driven by the same frequency of 500 Hz. 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 distance from the person to thde fpig,)+panjq,6e 2) .fjx me 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 440 Hz and 444 Hz. What is thxpp(:5 an;byk7w9uxbtwm , t6e 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 to tune the frequency of a musq)+edbs e( qi c1cc-gh )-t*mwpo0(dmical instrument. If the tuner hearcmsqt hp i+mbe w- do)*1 -(cqd()c0egs a beat frequency of 2 Hz, what 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 jp po6mx9 p5c fd9x,-vproduced by two horns are 6 m and 7 m respectively. What beat pfm5c vj9pd- 96,xoxp 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 strings on two violinp*oy r *lr,ga+s in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hzg* o*yr, +arpl is played. What percentage change in the tension of one 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 source at twic p+rgv)d1a 7omn 6jye6e the speed of sound. Th 6 povag16+m7nrj )eyde observer hears a frequency 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 freek08 wnvyvb2+7y+p t mquency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a frequencyyvny0 e2w8+ v7btmpk+ of

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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 of5a.tfvs0f4d f 1000 Hz. If a listener moves with a speed of 30 m/s away f4 tv5. ffa0dfsrom the source, what is the frequency heard by the observer? (The sound 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. Iti3hr8 yui 5 r3j );fzoa)a/t2r ayrb6d is traveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the road5;2yyrrd3h)air/z o a f r8uai)3tb6 jside. 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 statimc nw7q71c. o(:j)bzxxae r9 honary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound is 340(9qez)1h.worc bm7n 7x ax:jc 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 itgzrqq719xh, ggn g. c/hi ;qg.( :tojhs 400-Hz whistle. Ta,zqct7qog(gj9r :g hgi ..q 1gn/h;xhke the speed of sound to be 340 m/s. What frequency do you hear?

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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 12 w,edyi a l*jf)i:7r/y0 km/h toward a stationary train. The train blows its 400-Hz whistle. T ry:f *i/lj,wyda7)ieake the speed of sound to be 340 m/s. What frequency 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 wy6u 7bn*rg2 lohistle. Take the speed of sound to be 340 m/s. What frequencyu72l*6 bng ory 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 120 km/h. It blows 15+ p rzwokyeq/g/+qt its whistle, and you hear/g wtp+or+yq qez5k1 / a tone of 400 Hz. Take the speed of sound to be 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 trawvo;t0 )oq.wa in horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequenc vtoaqo ww0);.y heard by an observer if the observer is moving away from the train with a 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 6gvsyt n-c (,8c; q6w1 tr kx(snt)tinhorn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer nw -kcy(q;16n 8ng)s cxrt ivtt(,st6 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 determi8ajsr(ubjkjog*4 )5ll/y6cf9-cb gu ne the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is return uc)jg5(b-u/s*6 8 yk4rf loa9lg jbcjed. Assume the speed 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 bk e w9u5ppd98dy a supersonic aircraft 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 the half-angle of theio)ziys) l-0 x conical shock wave formio x)) s0-yzlied?

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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 Stauck; 1b-g g8yktes to Europe with a Mach number of 1.05 where gcb8;gu- ky1k the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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