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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 false y 5a/l0s 22x 6feuxsdkig 9h0jstatement?

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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 tyb 0u(p5w:6j6 ) amq s pkjco/0.v pvpgu7:qfghrough

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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 i,pzr 5(i c7pbzn 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 inc9toe+low 9w7zd) b.kdreases, what happens to the velocity of sound? (Assume that all other factow dlzw7.)od + 9oek9tbrs 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 r9 z 1sxfwew62sound throu1 wzf2x6swre9gh air 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 *4 1qa p.gap5,cyrdf bsound, the wavelength of a 200 Hz sound in air isp5 dry1qf*4 ,cb.paa g

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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 tym,k5a1rstz0 kn .t a+han 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 areepwvtl .0y76+ompt 3 ljc5.ik 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 em)w *mf+r7 c9yg -owhnyitting waves uniformly in all directions. If you move to a poir+- w9)w*yc 7fnmhgyont twice as far away 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 diverging waves, intensity is proportional muk4bo- e 75/ycetc8m 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 sourr z4iyf:v6p) fce at a distance d from the source is I. What is the intensity at a distance 2d fvzr 6fyp :f4i)rom 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 sou -sizwq*v nt.++r ;l11dp d ky)makwd-nd source that is radiating equally in all directions. What happens to the intensity of thepqs1kaytn i-*w wzmd)l-d v1; kr+ d.+ 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 radiatingzju7 v-a ,: /utxs un5l8*zypx equally in all directions. What happens to7tpj,xzxa:*vu58/ ny-uz uls 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 jo v r1 5sc*rn5vef20zsound 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 asfvx-(nv: + zj speaker emitting a pure tone. What characteristic of the sound increases(+n- sjvxf :zv?

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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 musi,6 gkyot bh+k bk7g9(hcal 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 "sh.ru : d0fi4qpitch" 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 ai .pnfw o46hk8ir 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 are7i7n .5ot9b r mgbt(kx

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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 generated by tht7t1fhbic : v6e guitar as a result of this vibration. What do th7c htb vt1fi:6ese two waves have in common?

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 op b /d rd.ae7s9 ypoouj*xyi6xyj6a.q.9.pxu5en 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 ar8zvd-j )h )d,e(ln (d ovtolk,e the wavelengths of the three lowest tones produced by thi,ej)ovkv8 ldd on)-zltd(( ,hs 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 in1cbv0o vpvy1o.b-tla 0zk,jyg: .o: a an open pipe of length L is 200 Hz. Which one of the following frequencies will not resonate in 0:v.0a:vbotlo kcz1aob1 ,pj . y-vgythe 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. Which stajmplye0q9o1,r gl3 7 atement is correct?gj lyo3lremap 7q,910

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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 and5se.c5bxz,7 un ym/t;:m+g2jq tcfk y 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 h* l9u .llwivvul;q:+8jibh;length L. What are the wavelengths of the three lowest t*;8ii+qvu:wbll hul9 v.l;hj ones 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 L is 200 Hz.vfg qyh1 x,- n 94r7qqd0 h4v2xv4ftbp Which of the following frequencies will not resonate ig0dp2tf4h749q h xqnx fqv4-v,bry v1n 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 its fundamental frequen/rh 9dccja-zw*-n*z aoc,1h scy. Which statement is correcc1-h/z rsz-*acdwaj hn,*c 9o t?

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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 drivengojx *ts6vaal-5o 3 1n by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 336a - j ngt*1avlx35oso0 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 souo;r u qe7n;bg6nd 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 together and a particular beat fj,,; nflu6 , cjawn0u2yce6 uerequency is heard. What happens to the bea ujn0aec;,e2 w,u yl6fnj 6c,ut frequency if the frequency of one of the tones 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 expi5a(pw1kiy36 z kplw ; 2dttq,lains

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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 stati,w .2f+ pz lo+8kc)bwhrgcdl+ onary observer. The frequency heard by the observe +),lb2.h+c+ zw8oglcwdf r kpr 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 statag/u 4:r slzdr nnu.:2qy.7h qionary observer. The frequency heard by the observelh:s z4 .drnq7u/yn.ga: qr2ur 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 doublje: wwpj0nyy9hf6/ t7fll .4o e its MACH-speed, its half-angle will decrease by a factor ofy.0l 4p f9tfw6:/ ej ny7hwloj:

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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 freq s7h nyk4y8hy d4ppg*6uency 45 kHz in air is 352 m/s. What is the air te spdk*yy6n478g yhh 4pmperature?

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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 inzw; g 1jmir-+b 2i.eyz 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 340 m/s, a bat emlv98j: ldjc.02 yefuoits a shriek whose echo reaches it 0.0250 s later. How far away was the object that re2jcj 8.evfly:d o0u9l flected 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 temi oy; 2rr,yg4((,wyxv en2sbzperature 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 sjw rjn(w:y3)g vw12e0pnbh * l after seeing a flash of lightning, the distance to the lightning striy3*h l:(1gjw 0envrjwnw) b p2ke 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 on a day the temperature is k3sf t p2vrh46r g0w0q$15 \; ^{\circ}C$. 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 later. How de thr*v4-;fpnnep is the well? (Ignore air resistance, and assume the velocrp;4tnn -fh*vity 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 ceg 4o/ 9se(qrcxnftr *-4q*+,efxpa of a sound 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 ai0vnlky3v1up:7c n 6nir 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 s8.dbo5 uo;iy t5l7fvah6e ot/ound with intensity $10^{-3} \; W/m^{2}$?

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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 so6c-) rt42ye2vf clw xmund?

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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 s,77ku vkk/d ejounds with intensity levels of 70 dB and 4uj /e7k,dk k7v0 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 q) n2kl-x.yxha 6bu )s15 engines in a garage is 100 dB. What is the intensity level generated by one esh.2a6b) ku )ny-xqx lngine?

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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 fro hunm9f;hm9c:xmse4 , w tf7i0m a source that is radiating equally in h m:ms 9 whiun70;,x9eftf4 cmall 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 radiatingx9o.bs1y8o9,v qsoms equally in vx8 ,oqysbs991 .o msoall 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 g ph43zwzh7m ht9s +ac9dk+,f about 1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distanamhk f,g +c4tzsh7 wz 39dh+p9ce 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.g87 su,4s g-c5dw+mof crhez,00 m from a barking dog. What would be the intensity level if two identical dogs very u,,shwc7gzde g8s 4omcr+5f- 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 so4m g9mdvykp.gh.xl , -1qn5bh7* a vryurce the intensity level is 60 dB. What is the intensity level (in dB) at .9 vx1*gmm 7nkqyg-.brdl hayv,ph4 5 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 source is 95 dB. At what distanu:i k;v4ci r9wce will v:ii 94wkucr;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 1200 Hq9oy ag+ :xl)eqc6e3gz. What is the frequency of the fourth harmonic elco exag+6)q3yqg: 9?

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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. Whatag8h2 j- egwn9-fm8mu is the length of the m-wjgumf89 ha8- ge2npipe?

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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 ori8 oob/, .pqfv9 gr,cw (ryn:f length L is 400 Hz. What is the frequency of the lowest tone that will resonate in awrf i gr.9 vro(:/y,q,obcp8nn 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 0.8jh*;x aq le+w4 x/lgp90 m. If the velocity of sound in air is 340 +e;l*axqxl 4jwp9 gh/ 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 ro20n h:r)c ajq76fbo /h f rdtsu/l3:cmom 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 end is 330ty0t4k b go/g8 Hz. What is the frequency of the thirb t0og4 8kytg/d 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+0p rw;lw0ncg, l ld4 oaonb/9 one end that will have a fundamental frequencawbpll +n4;o,w /0no 0 dcrlg9y of 60 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 where the temperature is-uxu bjyw-c5l6ox* 3y $20 \; ^{\circ}C$. 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 th5rzd gjlu eci:s77 e/(e 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 when the speed of sa lcz 0iegdk,zgh xg-dc5y51p0 uq)+,ound in air is 340 m/s. What is the fundamental freque-uiy h)0qdcz0 cl+, k5xa 1g zgpg5,dency?

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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 1i 9wmz9xazvi:5dzo 9 bwh9)qother is closed on one e9i95xi19vq d:m 9)wzzz oahwbnd. If the fundamental frequency of the 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 ovgu.(5x up st3.gbrq6xc :+xnf 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would souruqgs5+xvt gnup.x.x3b : c6(rce 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 sibfx 1s/rp g/6 4fah 6jkgv9jw5de 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 g/ fa/651 f46rgxs vp j9hwkbjto 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 440 Hz and 444 Hz. What isx81+ gw0m owva 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 to tune the frequency of a musicf)pj-c(defc7r *z1 1qr pi 4xcal instrument. If the tuner hears a beat frequencyxzqd-i 17(prcpr cjfc)f e 1*4 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 hyg(reepehm/ r31dvcw ; r57ou8)/ zq forns are 6 m and 7 m respectively. What beat/ 1g5 er/zyp(;crdrfe3heuo8 ) v7qm w 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 violins in an orchestra are found to p tx*aa)r*7dnafnf(d) roduce a beat frequency of 2 Hz wfa)aadfd) t*n n7(xr* hen a frequency of 660 Hz 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 twice the speed of / sh dhgoup0+5-lps0jmzdny8/ 9tw7 ysound. Tohu+ zw5ydn h0d0s8p/ -lps/79 gyjtmhe 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 frequency of 1000 Hz) appro 7k/k8rdl8kb waches a stationary observer at one-half tb/87k8 kldrk whe speed of sound. The observer hears a frequency 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.gaoz.8 tu mz,0t. o1uu If a listener moves with a speed of 30 m/s away from the source, what is the frequency u.a.zo m10tzuo g8tu,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. It is traveling at 35 m/s on bv3j3tcezi u*:zdw 3k ;gtc) -a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer j ;*cz:t-z)uk3wgtb3 iv ced3 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 , zhinzna6h64when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the sp 6ahinn4 h,z6zeed 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 whistoj 9g/nl nifv v9u9-8rle. Take thifnv989g/9- n rvujole 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 120 km/h towarv5ohdyg9b5/k * , oa5yu*tswed a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s.5toeu9 by*w,y ovhd a*k/g55s 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 awa )kzjri7,j (6 .o.2pfheenqoiy from you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What nk,ohi6q.f) 7zje ijp(r2. oefrequency 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 yo)u6cp uv/g .5i 7chatku at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound ha.vuicktgp6 c/u7)5to 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. Assume the speed of sound inn..h.havbg ne g fy4.zv(:0xm air is 340 m/s. What is the fz:e.xfvh (4m nn..y0gag.hb v requency 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 hop:3:y 0(wvdy mfut x33byc o4krn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observebpvtw0yc3ufy3m 3k o( :4 y:xdr 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 s50ks:.j ym v0mgk2+w2nrbqhkpeed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound i hr+ kkgs.wmvj20kn: 2qb5y0ms 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 aircraft8f bsxb:.pu aq+1yq4 m 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.l5ewio: cix+ * What is the half-angle of the conical shock wave forex+oci* :wl5i med?

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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 m7bz4b7r/qno+ymj r: Mach number of 1.05 where the air temperature mr/jz4 mnrb:b77 oyq+is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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