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习题练习：Physics Unit12: Sound
本习题练习来源于题库网 (https://tiku.one)，是在线习题练习的打印版，您也可以访问本平台网站(https://tiku.one/)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://tiku.one/test70.html
 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 ue8ykpba mip4kd8m04rs60k dr7x48 pa 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 conductepdz31nl z+ if1 sm,vp0d fastest 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 sound in j 9bd z5.6vfa 3cagnb3a 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 i 0580 pznckzqfjlzn5 9ncreases, what happens to the velocity of sound? (Assume that all other factors r0 9npfzk 8 n50c5zjqzlemain 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 Hl*,cz+8u +wcy6rto : hgs9(7pn4h9 utjqrxv cz sound, the velocity of a 200 Hz sound through air iulr+g 9svnxh9 tc:qzju,6wt( p4yc+*o c 8h7rs

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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 oot4rdmbjqrc/* 3w k;-:t ,gwaf a 400 Hz sound, the wavelength of a 200 Hz sound in air d3w*/tgrq,k;rj4tbao cm: w - 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 frequencies greater than 20,000e x5hxu/)xgfdqf(j20q (iwlq j4k2 n) 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 f3b/ot*v. o adyrbx;p2 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 waves ungbvxq2p46.*uwrr50 fa m) luwiformly in all directions. If you move to a point twice as far away from the source, the frequency of the sound will b4 *parxfgu.w2w60r u5)vqlm be

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  For spherically diverg4q 0d:kwfo4nzing 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 d from thb,5; /iyu*wdifp d4b me source is I. What is the intensity at a distance 2d from the sour *iwfybi,bdd m/5;u4pce?

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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 .vm3od. mxqd v d+dgx51*w(dcequally in all directions. What happens to the intensity of the sound? It reducesom(5 gxdd ..q*vmc1d dvdx3 w+ 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 euajqz-2yo x* eb::z 9vqually in all directions. What happens to eq xa2vuzo* -9j::zybthe 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 loud 8-m.v,;*rs rw rbxhayer?

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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 sp+id-nn 2q :g c0pi 1fzdfb:ae;yfg4o (eaker emitting a pure tone. What characteristic of the soundan-o eidfq ;fcbp 4+ fn(gg dz:2i0:1y 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 musical notef:kc y mp5ku.* .ddk3q?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the h-1 +v3q)eno*ogm5 a,b(nq;z jp yvpz"pitch" 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 uj 3 hpu3w7+0buiibi(r 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 anigeu- 3f- gdpswy509i1dq,u re

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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 andgj dva1. g0gy2 the sound wave generated by the guitar as agyg1 va0dg2.j 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 open at both ends, th s76 sk*ad9zwiere

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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 ofvkmnw4he1 nvv 5 bo81254ww jp the three lowest tones produced b4wpj1n1bnwkm 8 55ov2 4hev vwy 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 200ijir6 xg e; oxtp0e+1/ Hz. Which one of the following frequencies will /+xr ge0;6 oijt xe1pinot 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 fundamental frequu a bf6v;,:a+eg neez+ency. Which statement is correct?zv u+bfe6;gen,aa +e:

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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 )u hq,db z2yjw c.1/(y+briauthe 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 Lv4// q(.zjiyg dm/xf p. What are the wavelengths of the three lowest tones produced by this pipe4z fypv./ d/iq(jmgx /?

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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. W q*6ev5eic6285iawzrhq) koa hich of the following freeraozk5 h6 )8vc 2ia w6*iqq5equencies 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 itsly qxq7n1byd k,z02zm0t:uj9yza,(l fundamental frequency. Which statement d:y1ybmjzzq09 un(la ,qt,7k yzl2x 0is 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 dric 7 hfrbxy9-a:liso(/ )w s*fbven by the same source. Each speaker produces a tone with a frexlb o*h byfi/ s9-)(:rsacfw7quency of 200 Hz on a day 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 0khr-v6 gkh/(jyyzc:, the two 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 soundez.dp 1/heiocnrubv9dm 4 :*g )d together and a particular beat frequency is heard. What happens to the :mvo41r9idghb denp c).u/z* beat 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 explain3anecy4)div* s

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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 frequv,qr-s2b xixr;)vv1v17 uhp yency heard by the observer isr-1v2ib yhrvx7v,v )ux;s1q p

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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 observerlitt 7u8pu) eo) 1p:rbge65rr . The frequency heard by the o ur 6)l7p:5iuor pg8)b1treetbserver 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, itm5nd2ij s .bs1yunx1, s half-angle will decrease by a fac 52 y.u1d,1jnxnsibs mtor 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 isut, ddfk5p;4 v the air temperatudfdu; ,v 4k5tpre?

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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 o svhem 22nwic k(,x9q3r xa /vam:de,l)kw7o+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 of sound in air is 340 m/s, a bat emits a shrie ykrlc ec6bb ))a-moa 1-94jork whose echo reaches it 0.0250 s later. Ho16eab)yra-jbm c)o4-k 9clorw 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, myfr1et 15 aan1k ,bo cpsz+7;and hear the echo in 4.00 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 lightn wb39glu qy8xp.c5hw /ing, the distance to the lightning s w539.8gb/lhxpyqucwtrike 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 temperatu7wtc c b+d+a8gre 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 later. t.-f3qqb8h e b How deep is the well? (Ignore air resistance,. qht -8bqfbe3 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 wav,nw;su7 edotue.u3k- d,8l,eh g az)ne 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 air :skrbpwr v , 0o.(ed/dat $23 \; ^{\circ}C$ 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 w 8a1g/w4vzti m4,q nz56wed/h iludr- ith 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 r/ r i4*-aw/u*eybmqxof 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 of two sounds with intensity rc53is - z8502on( dsbmih atrlevels of 70 dbrzn0d h8i cs5-a(t ism r325oB and 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 engines in a garage is 100 dB. What is the intensy)r-k +l.;lq okf0 pwmity level generated b.r+o wllfkq y;k-)0p my 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 6.0uqddx3b)sp3v2;.iv-b 7o9 iglcnbi9 m from a source that is radiating equally in all directions is7vbsl )2dg3i; up3idnv.qx 9ocb-b9i
$6.0 \times 10^{-10} \; W/m^{2}$. 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 d10p rlqb0tnk * ddrs;jqu+77xistance of 6.0 m from a source that is radiating equally in all directitund p*bd 7rqr;l1j7q +x0 sk0ons 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 mf/nller74j g*h 7k3oabout 1 mW of power, which is assumed to be uniformly distributed in ar 37lmgo k7j* lf/e4nhll 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 dog. What wk1 xv. k4feyt j sd,v/yw*ol+a,fo4 p,ould be the intensity level if f y*ajvtpl4,wk+xd4vyfoe.o /k1 , s,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 f ; 6ke6kd7ines:w-agsound source the intensity level is 60 dB. What iss6i6ad g kn:f;7ewek- the intensity level (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 source is 95 dB. A qkm kk83i9b c:xuw1x.b;i +hxt what distance will it be 73kbi8k:9m +hx.;u1bx kcwixq5 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 1200er:(zhk39 ))cjio z8*bhdfgq(v ve z + Hz. What is the frequency of vq9e+e*jdzgkbrz h zv)f( co( ih3:8) 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 harmt5-x2dui 1j5wnllt2z xc8 .ax onic of an open pipe is 900 Hz. What is the length oc58xjtt2x d i 5u2xlz.- w1nalf the 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 ij9d rw598 ok) subw8p4zl,u uys 400 Hz. What is the frequency of u8y4odj9uwwk,8uzp) 5l9srbthe lowest tone that will resonate 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 lengtq: qu d.uu*y,6yo2w prh of 0.80 m. If the velocity of sound in a ,r6p.o:q2*wqy yduuuir is 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 thepoog/q +fu9 w0noo82 j 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 x49py qfu-8g l330 Hz. What is the frequency xq -49pfl8ugyof 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 pip, xhq(0nx+jxd e closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound is 340 m/qx( xxhjd0 +n,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 is*pti ,df5(4fogw4e t n a room 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 is xtu zsho.1+vq*k1qc ) $20 \; ^{\circ}C$. 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 sound7 0n 3e up qz7sp n67aa(hs*pjgul6*fk in air is 340 m/s. What is the fundameez6pls*6qh37as7 g n upu7 apf kj0(n*ntal 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 e d*z ks/(xtz(the other is closed on one end. If the fundamental freque((tzds*kxez/ ncy 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 of 800y.vn *.w0 9jhtteom;1g xvcq1 Hz in air where the velocity of sound is 340 m/s. How much 9. yx1vo1jqwthegt m.c0n v;*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 side kkj( l 6n;+dgcuabhf-+ln*3xand driven by the same frequency of 500 Hz. If the distance from a personkdcu *3fk+ll 6bnj n;-g +ax(h 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? (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 qc*f2 21oi:z x kmk7ygand 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 to tune the frequency of a musical *ewi- (4vmj 9aw7(x)nifpp32p gdnsw instrument. If the tuner hears a beat frequency of 2 Hz, w*en-4(ji gp wpsin3xv(wdwm2 a f)97phat 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 t ub f6n8q(mib4wo horns are 6 m and 7 m respectively. What beat frebu(648inq mbfquency 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 strinscq q6n fc*/dnn,5 tuawh9) 9wgs on two violins in an orchestra are found to produce a beat frequency of 2 Hz when a n a) 9fh5dtn*c,qw6sqc/un9w 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 sou 5s-anxr19iao rl6chz ku7c/q+,3lulrce at twice the speed of sound. The observer hears a frequenc r59u1i aa3,ro/hl67 unlslc xqkz-+cy 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 a stationary observer-iff n x1i2h5g at one-half the speed of sound. The observer hears a frequenc5-ig2 f fhixn1y 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 moves with a speed of 3 iq/ej/ uten* yf wyal:a-w0,90 m/s away from the source, what is the frequency heard by the obseni-* y,ay09/lq f wwuj ae/t:erver? (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. +0e+v dmab*ic;f1yg o It 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 roadside. What change of frequency does the observer hebem ov+0fdacg+*i1 ;y ar?

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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 he zyhj8q7wq) +yl n(gq4ard by a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed4gyz7q+nhqj q)w ( 8ly 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 yzidtd. q* kotg +m.-:kou at 120 km/h. The train blows its 400-Hz whistle. Take .kz*kog:-tq d dtmi.+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 120 km/h toward a stationary train. :pk(vm,ce.5 t* nbhbj The train blows its 400-Hz whistle. Take the speed of sound to be 340j, :ne*.tmbbp(v hk5c 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 8os ).e jxgwyv33 xrdni pu(-;train blows its 400-Hz whistle. Take the speed of sound to s).;e33 gx( dxpw io-rjvny8u be 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 120 km/h. It blows its whistle, ande;en8 4fbfx hmhzs3 37u+6mtm you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency of the whistm64b3s 3mmhf f+;8nu7x ezethle?

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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 *ty7 )zzc gggg6mb5 7dis 500 Hz. Assume the speed of sound in air is 340 m/s. Whaty cg*g)m z7 zt7d6b5gg is the frequency 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 500 Hz. As9 2xjpo5hsr 6z;xjm+asume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the t5 xzr6 o9jx2;jpsa m+hrain 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 senti98gtz 9b,xs b out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the object 9zisb gb ,xt98moving?

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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 aircrafytvkv q h5kq-s0ox0mi x57+l +t 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 half3vmuza 3ovdzv :u8:c,-angle of the conical shock wave for:od 3zm:zvcu ,u8vva 3med?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Concord airplane fl.p;e-jus0 xs l0;it keof*gi1ies from the United States to Europe with a Mach number of 1.05 where the air t;l1 i*os.si - pjet;gx0f k0euemperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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