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习题练习：Physics Unit12: Sound
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 作者: admin  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 is a fa 7a3bqp-qphy s)rxs ;/d7 j3gnlse 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 f9p go:ijl4tjxw;59un astest through

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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 sou+1 w/nxq7d lqdnd 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 soub5h .hhice96 jt 8 nw/dxmrc*l3gs(p/nd? (Assume that all other factors re nd(/s j6hewmbh9cxhrtg5ic l/ .8p*3main 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, th*y /o7t k1jadje velocity of a 200 Hz sound through air *ky71aj dotj/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 sound, tdkvec iz3k5n,o(za on- 9r 41the wavelength of a 200 Hz sound in airtkv (kd,95z3ne 4a1-ozno cri 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 frequenc8 ec +4yjrdm7yies 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 fq,;1fbgwjma 4,buuv49h6 qxl requency less 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 wavebc uuv+,9 zu;3bgik2m ,p pdi3s uniformly in all directions. If you move to a point twice as far awa vbup c, dugm 3,9pbu;+z32kiiy from the source, the frequency of 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 diver951anuux p sr8q+ ;di9s8 m kjtfm0bc0ging 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 at a distance e p72ctl*sm5 7c2zpwbb-c 0hjd from the source is I. What is the intensity at a distance 2d from the source p 7*p7c20jebmt-scw bcz2lh5 ?

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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 soun *zw rsq;3.k3sn jqn.db1 0nmed source that is radiating equally in all directions. What happens to the 3k ws3d0 nq. 1rzsm .nqn;e*bjintensity 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 radk51;evt0fe. t0 +tk(hx3xphhpqi (ip iating equally in all directiv5kpt3feh h.hp;xp0t(0k1(q+ii tx e ons. What happens 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 be/t3-iuyrds. -m;* q/nunn pnbcomes 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 speaker em,y 17afll(zowitting a pure tone. What characteristic of the sound y1l7fao,zlw(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 mu3:m op/.7 y 2f;.bawchpohxs wsical 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" of a musical d)x7z3 nbyw 91azbdye;58tninote?

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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 airs e/3* g hk+ul-ocvy)p 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 displacement waves arp f0 lj5 ckr uzem+h0w*rrgj//b4w .+.m8f xlte

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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 guitar string and the sound wave gyc--hxjfx;w . enerated by the guitar as a result of this vibration. What do th.x-yhxw -;fjc ese 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 oas/l4(x- 74 iukmr ab/f oya(open 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 lengt.w7rkeu7 kkh hkx8 2o6h L. What are the wavelengths of the three lowest tones produced by this kru2 7hk.oh6kx87kew 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 6kmhl 9l:f 7a+yhd2d d200 Hz. Which one of the following frequencies will not resonate hmy 7dl:2h9 flak6+dd 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 fundamental frequency. Whie7 rryj +5w 0it 3(0dbr0vpiygch statement ise5b d 0yvpijr3y0 (wr+gr70it 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 r.i2dq;dcqcp 2y* dw. closed at the 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 pipe of length L. Whu*pmw dv kl;vxs-;9+g at are the wavelengths of the three lowest tones produced by thi* ;;gvp9dk- u sxwmv+ls 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 yu 4nglh ) di+gx1;wl .a3b1lxclosed pipe of length L is 200 Hz. Which of the following frequencies will not resonate in that p)u a1hw;gnb lxldy1.x3+i4lgipe?

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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,k za. u )nvf;o 6jtfq 47lu+bbebi0;f at its fundamental frequency. Which statement is co6.4kb;zvuebj 7n lf tq)f0a, i uf;bo+rrect?

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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 r x7(dcia)od9same source. Each speaker produces a tone with a frequency of 200 Hz on a dayi r(7dxado)9 c when the speed of 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 two sound waves should zf1dhm7 wsfq1d+jg52 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 is heard4br: of rutta-. z4exw p93t9 ryqta/1. What happens to the beat frequency if the frequency of one of the tones it x1:r4a.zr -o 9wfer9t/ 4ayu tbptq3s 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 explayp 3+3( mpvunains

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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.e56alr mk)r:gk; hzj4 The frequency heard by the observelkz54e)rja g;k6r: hmr 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 frequency heard by )cmf5l t. r8+*d2 k6jc*s rrej3:tahaph av9kthe observe+5*9ar8 ctrk).csjk3dl:2h j famt rh6p * vaer 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-anglebvwk /y01 3g/g gjss1y will decrease by a factor wygg/k0bsjy1v s1g/3 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 airkrbn+ /ce0ckb u00g8v is 352 m/s. What is the air tg+ckc ek8 /0unbbrv00emperature?

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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 sound i pmzbe10-r; ro w8sg;hn 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 of sound in air is 340hk g vz ya(crm4)hr58bbu -nv-iw1r ,( m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back ab-z(g in(u8k1r5 ,rw)hyc-h vrm4v bthe 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 temperatur/als9gv1 l uw 5n9n,rl*op a:je 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 10n bx)d90coar5 b*cm.f yaxqlightning, the distance to the lightning st9aabc cmx*.x)1 b5do00qf rnyrike 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 from a cliff on38tgzdnl)sz k/o 9mt3 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 and hear the splash 2.5 s )9uqs;ilnrog v q/ 8a7*8 dc+ubud2 rjlater. How deep is the well? (Ignore air resistance, and assu8/7)u+29*gdqbir nd as8c ruju qlov; me 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 sou)f0nm lk6y35 *b9go 6cxjl khhnd wave of frequency 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 adzzyf8 i+ mw,4ir 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 intensitysfucbhz+x2 w+9lo 0v/ $10^{-3} \; W/m^{2}$?

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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 70-dB sou, w2kne9oj ba0nd?

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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 intensityt sh0 64ps.o:kpmzly/ levels of 70 dB ants:h.4 pp6 ys/z0molkd 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 by 15 eng14cwrx) : wy ; fx* yn z7nmzpk:(oo(*ee2pbxaines in a garage is 100 dB. What is the intensity level generated by one e*aen2 e(1wzp bcxx4)(7zfyx:no;:my p*o w rkngine?

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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 tha+w mevqjh b3w r(7p(*wt is radiating equally in all directi+w3wprjq* w h(em7 bv(ons 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 fro 5gsma8ag-/ xwm a source that is radiating equally in all direction - 5a/agwgms8xs 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 assuvgmvf w 1cf;b) ;d1q5xmed to be uniformly distributed in all directions. What isxv1gf1 w v fbmdq;;)5c 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 axhh03i;c- zif7n9woplmn h -(t a distance 5.00 m from a barking dog. What would be the intensity levhcoi9-h p;l3f him (0 wznx-n7el 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 intensitz/hox+y8xem dy dt.r69r*i2xy level is 60 dB. What is the intensity leox92t 6/eyxiyrdzxd m*r+h8 . vel (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 mv gw.av 2d.k2opqaq- 8 )ofs.a from a point source is 95 dB. At what distance will it be 75 dBqw2pfq a)a2 av.8og- s v.dok.?

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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 cojdp) u2 u qiye*blt6a 3hxgg/vx+01y)mplex tone has a frequency of 1200 Hz. What is the frequency 3ugpay16 u2* +glbv )dxei)qh/t xy0jof the fourth 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 c-x9yue6bju,p ,qx0iq1x+ cmg 2d2ycd,;gyqHz. What is the length of the pip2q,d0cuq-y1xpq j2bi +dyg,ym,9xcgc xu6;ee?

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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.;r6)fvrgf* w q(cj-ppzg if. 8 What is the frequency of the lowest tone that will re z*.-fjpfq(6;r)v wgirfp8 gc sonate 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 m. I0wxzc v)w (6zy y(ud)ef the velocity of sound in air is 340 m/s, what ey)(cyzw u()wx z vd06is 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 azw4(e2t84gszkqx (jlcds r *tlg, )(x room where 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 enm2,f,8gae2zsb (l rrmd is 330 Hz. What is the frezs2e2(rgma f,, lm8rb quency 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 on one end tha hbo 4d2 o ceywll5 5bcmw0r5hp4p88,st will have a fundamental frequency of 5w4behlc, lpb 4o58y8d5o h02r m cwsp60 Hz on 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 (2dfav0 7polo where 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 where the temperature i6 p4izn.ktobn nq2.2(o-u wuz s $20 \; ^{\circ}C$. 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 isi6wkx pna*;v8np+. 11 qizv tg played when the speed of sound in air is 340 m/s. What is the fundampqv1gn it.8ax6in ;*wv z1kp+ental 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 same length: one is open and the other is closed ji8j7d 62u8pnw ch 8yh btni2 4n5qh7z/9 ydffon one end. If the fundamental frequency of ti8jy2i85j n y zdw9 tpcfhnbhu67q/dh fn8724he open pipe is 300 Hz, what is the fundamental 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 a frequency of 800 Hz in air where the vue4gt(: ymthuod r7h hj)h:he ,7iq-nj .x. 8lelocity of sound is 340 m/s. Hhl7 oh.xe-t4i (78h :ju mrn)eth :udgq,y.hjow much farther back would source 1 have to be moved so an observer 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 side by d4gv -w81h7kub0:y ;vxs vdty 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 the other speaker? (Tv:y78 0; 4bh1-ky wx svgduvdthe 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 the beat frq,w( j4n /jktbequency?

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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 frem0 soc *g)fsyi06gx8 aquency of a musical instrument. If the tuycas*0 g)sf06mxo ig 8ner hears 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 produced by two horns are 6 m and 7 m respective *r c zxb86 7v+xlsnm(f:vyt:rly. What beat frequency is heard when the horns are sounded on a day when the velocittlr:cxv :rs+v6x(nzf *8m7y b y 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 violins in an orchestra are found to pfv64qh2z yo b lbc gax4.c3+*lroduce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in xb.faob6cvq +cy4hl 4g 2lz*3the 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 twice qc8 m7o,xchl,ups m69 the speed of sound. The ,scpu c9,l86 xmq 7hmoobserver 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 frequency of 12 rbj9d e7bj0akue/n8 x1l gv0000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a frequebe/1j08b jgeanvku 0 79d rl2xncy 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 of 1000 Hz. If a listener mol6+ v+(ofvgwav/s jx9ves with a speed of 30 m/s away from the source, what is the frequency hearlvg v+ 6x+ o9/ajsw(vfd 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. 0(h ,4*fhm6m gmkyjdc It is traveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The carg*y,kj(f4m 6m0dhhmc 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 observer when a tt9ik/ iua9wn /dl/h 0grain approaches with a speea itdg kwu 0hli//99/nd of 30 m/s. The frequency of the train horn is 600 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 yo*ex 5wy.a(trdl-o3*8u0i f (wtd oi;bkq6oqru at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. Wh(b3;y*6q o*8 td5.0wr ko ( uxrliweaq-iotfdat 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 120 km/h toward a stationary train. The train blows itsxooes 5 ,m;,9t xjcnuu8vb+zc3j1ek 3 400-Hz whiuj9j,c 35k+ ;uvs 8n1exz3o,mc bo xetstle. Take 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. Thv 78ig4msb4l x1x/jy ge train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What fb4 ivx mx14lg8jy7sg/requency 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 its whistle, and 0esehcs*b 7qjs;;*f k you hear a tone of 400hce b;07s *sjksfe*q; 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 train horn is 500 Hz. Aspdj608 w6ultb ,uqe z:0f qs7jsume the speed of sound in air is 340 m/s. What is the frequ qwzdjqble7tsp6,f 6:uj 008uency 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 horn is 500r)*9l2u rqb6pupnp e6 Hz. Assume the speed of sound in air is 340 m/s. What is tubr urpq 6*9n2e6)lpp he frequency heard by an observer if the 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 signal is sent ouh)r3blhd-n+v2qdx( pt, and a 42-kHz signal is returned. Assume the speed of sound is 3+3hhvlb q-(xdr p n2d)45 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 th-mfsr8 lh,; yje conical shock wave produced by 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 the conical shorknddr2 z6)/ hpy,u8b ck wave formeddn2upb6rzr 8/dk) ,y h?

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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 a Mach number o8 z.kybu by)j.zmg0c8f 1.05 w ugy8m)kz8c0jbbz.y. here the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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