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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 is a false iblr c 1(mpz26us)w6o 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 tc6i vr4p,3gpnhrough

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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 steel rod?nhbi+9me*r +1:o-ldhrlp5cp/e ; aad

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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?qd y./e;,mddo0w guk( (Assume that all other factors remai um.gewk0 ydo(/qd;d, n 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 veloci(z.l(qzrtab 0ty of a 200 Hz sound through air isz qbra(0 t(lz.

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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 4lv 3:d3l u*h,-p ypvlw00 Hz sound, the wavelength of a 200 Hz sound ilv- huw,yl3pdl pv :*3n air 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 237p7 xbuqfu 5v0,000 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 freugl: o ; l :rnty r)3jdj-q-s/q.*mddequency 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 sourceqf) )0ofll fx83rin fr 60u+rp,k 6oiy is emitting waves uniformly in all directions. If you move to a point twice as far away from the source, the frequerq3lol0xnff)0o)yf+8k i, r6fp6 ur i ncy 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 i*iab.t d bc)(zs 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 sourcepu* pm.7,zki t at a distance d from the source is I. What is the intensity at a distance 2dmkt.*p, iu7p z 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 sourceloeu a7jj j/ir,71iq; that is radiating equally in all directi;o je,rjii17/a q ju7lons. 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 fromc3i3t- l a jwd0ds0bn, a sound source that is radiating equally in all directions. What happens to the intensity level of the sound? It drops tad0 lsd3-in 3bj0w,c 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 loudg9((3g/lkd,v):h zb cx ak-qoe tbu1ger?

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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 spe sc8 xeqeo;:(v c mxh0x7u:ax-aker emitting a pure tone. What characteristic of the sound increshxevcqx:a7-xuox;80 ecm: (ases?

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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 note?q8t :yp.:p(zm z , n4do8txybl

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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 musicv1nimy f6fcr83*xm4 .b6slqzal 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 .scd-t e5+z :mamgy4 mwater

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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 ars45 3zzuo3efqe

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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 fzts vox+9 hi7z8hp *8sound wave generated by the guitar as a result of this vibration. What do these two wavzi7x8pv8 9z* tshf+ho es 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 ope6,v :mu ib*;tbzcbsd0 6sm9jrxvs6r/n 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. Whatlh.z7) (rfm7i -m 9dpytxqsc 6 are the wavelengths of the three lowest tones produced by this piped 7 zsf 69mqi-(mxyc)htrp7l. ?

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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 lerdp1ylu,+kht9v 8yo ny*z f*/ngth L is 200 Hz. Which one of the followi z/h rpklou*1*f8y vnt yy9d+,ng frequencies will not 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 f s,9t2ihl48dm md ed8dundamental frequency. Which statement md sdi28d el4tdm h,98is 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 onnmvuyvdw+m-,d2;a t 0bkp / )be end and 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. What are the wavelengths of the three loi- ff*4ojyq .lwest too4j *f- qylfi.nes 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 clb-+siz1fsx1vrxrj :.b+ jb :mosed pipe of length L is 200 Hz. Which of the following frequencies will not resonate in that pipxmj z-fsj 1: vb.+1rsib b:+xre?

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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 freqy9j s).ks) 3wug h,by c0l1ltxuency. W9sug 0)l.l jxbcw3hky1),tsy hich statement 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 sourp 0g iiwx)h56bce. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. g0ix5)6 pi hbw 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 soundr ftw-+ k/q +oqmqgub)w+vt, 710n00kaigi wv 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 a1stlvj 7pyoc/ie7ns)e u+ 40m50c grb particular beat frequency is heard. What happens to the beat frequency if the fre47/+ i)sb voc1e5t 0ylu7pms jn rc0egquency 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 explain 2r:) l*fly1u m1pooq/9-nkob/cyrqns

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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 b33 xhg+ il;big f:hnh0y the obs30hf gx;b ghi3nlhi +:erver 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 observer7ef9 ztr,1laea7d t8h. The frequency heard by the observe8a9atd7ze 7ltf,h er1 r 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 wilh*c c0x c2 6wnt,h2lkzrb9m/rl decrease by a factorn m/096*k h2,xl rcctw2bhczr 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 kew yqz hl4a+m z7h7a2.as2w5al, zv 2frequency 45 kHz in air is 352 m/s. What is the air52.zh m aa2alek2sz7a7w+v ,zylqwh4 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 sounyzl/cl/6 5 7xvvkaw c7d 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 ixc/7bea) stx:n 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 reftcxx a7s)eb:/lected 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 he.bh714z b-l caml3tqbar 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 lightning, the distance to t*bq8xg;n rn)q*qb m4f he lightning strikmqnf* b*8nqgb4qx ) ;re 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 da06lbfnm;2 b zinez-n-5c+iffy 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 sd -aa b ,y:h96; shclcp,rfyb0plash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the vs,db6cayal fh9c ;0rh, byp:-elocity 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 wavthhtqkmn ;;o4o ,/o .ve 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 at 9kt8 xl8wkk k)$23 \; ^{\circ}C$ 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 fg)e.sc;uffs7vd 43y 8m y mt: 40ivwwintensity $10^{-3} \; W/m^{2}$?

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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 eu*1 ez+tfl; x70-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 int:o t tgjj-x72x4;ihlc2zf1 is ensity levels of 70 dB and 40 dB?cgjioh l2x if4:z1xt j7;- 2ts

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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 dzmt1m v5urkks6l*+epq 8 ,0y rB. What is the intensity level generated by ur z*pl1q 805+mskve6mr y, tkone 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 o:j+qfr b8yup3 mpq0c5 f 6.0 m from a source that is radiating equally in all directi3br q8qmu5 0+fp: ypjcons 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 (25za caljy h5 u9 *58n(nb jlublrg*hequally in all direction( lj2nl8j59cgu5 nl hbu by5a*h(rza*s 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 un,z 2(7z-d: njtxhxxnniformly distributed in all directions. What is the ijnxt7nz-2,n (zh :dxx ntensity 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 puf96,6 07n r5b3;hkvdjkxzfx h0 jyh5.00 m from a barking dog. What woulh jyfu,xv065 hnb3;97x0zdp6jkf rk h d be the intensity 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. Wt od,6 ridjq9:hat is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equally in all directiod9i,:rtqd 6j ons.

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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 dis r:o;ejoct qy1u1 1ha0g:/ 8nyao2e-;l ax ngotance will it be 75 dBa:g:8/ tyo2oa1erjx g ho nyu;n1eq 01o;c-al ?

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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 1geka.f ;rsxfb3t4j ;6200 Hz. What is the frequ4s e gf;jtr36bk;.xaf ency of 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 otj/ ,fu,+-xjntyod4 i t0v 3cbf an open pipe is 900 Hz. What is the length o/ytnb0ci juof xt+jtv,, -3 d4f 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)) wxc0/ jmt0spy5is f L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of length )/ifwsj)0y x0pm ct5s2L?

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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. If t+5l 3 jwj9tiuz 5u2ipd1 yrjh.he velocity of sound in air is 340 m/s, what is the frequency of the second hap 31u9 z2i.jyju+wt5dih5lj rrmonic?

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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 temperature lnefl)b 6w 1tyy5/+kuis $20 \; ^{\circ}C$. 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 ee -hk f(2tmer;vsbc6)nd is 330 Hz. What is the frequency of the thirh s)ee 62t;m(f c-rbvkd 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 pil3p:z oyof5xhv. /c 4ype closed on one end that will have a fundah:ocx3vy./zo f5yp 4lmental frequency 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 wher7) df *yq;u t,y3lyzoze 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 tempernifmdqqy ;9iad01/p9ature 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 lenlz r 1tlkx/y+2gth 0.75 m is played when the speed of sound in air is 1lt+ kxr/2 ylz340 m/s. What is the 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 o5s c.is1-xa0w 1mig rcf the same length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz-x.si awg i01rcsm1 c5, 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 akz;r x1lty9q82 faww4ir where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in fron x 89ykwf4;lraqt21zwt 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 and driven by the same frequency of 500 Hzhrb b 88dyz8ze 6u(cn7. If the distance from a person to one speaker is 5.00 m and the pers z z6u8e7r (b8ydhc8bnon 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 an kckzw0sl/x1. d 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 55-f4-lj/i5-ifbx j tqp0-Hz tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat fbqfj- / ji4flx5-pi-trequency 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 prod6//8dd2ic l8r l civbbuced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocilriidl v d8 /8cbbc62/ty 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 founsm(v mkz2 ,hn0d to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension of one of the strings woul, zvhmk2nm (0sd 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 thy.v ph-tg2so+-gws t5 e speed of sound. The-sy .2vw-5ghs+gto p t 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) approaches a stationary observer a ttg3ki 2u+jf3,:xw1 vhan0c at one-half the speed of sound. The observer hears hiv,j3at12:g w0 nukfxa+tc3 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. If a lig)+c cjyyx hn49p8w 0jer4zl4stener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 340 m/h py8x4cec04wzyg n9 l)jr4+j 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 a day 0h ur a*il-)mfwhen the speed of sound m -r)iaf luh0*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 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 sk4ljue5tky udb;z(99 tationary observer when a train approaches with a speed of 30 m/s. The frequency of thdlb 4 ju5 u;(9kzyke9te 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 you at 120 km/h. Thk5bq::o jcj7y ddo (,lay0fw+gyx-k9 e train blows its 400-Hz whistle. cq k7y(o+ayjo59::ywx, -gd 0fjld k bTake 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 toward8:la g/h jizvv;;; fgxwg. ty7o9fup5 a stationary train. The train blows its 400-Hz whistle. Take the speed of ;; v/ujg 8lyg:wvtfizga ohf9;xp7 5. 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 xfp 7pw i3xf:glf-u. qk* *w0zblows its 400-Hz whistf0q.*- : xfww3ui 7zklf*pgpxle. Take the speed of sound to 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 ulhv doo3eb76j +b /c)whistle, and you hear a tone of 400 Hz. Tadb oev b7oh)l+ j3u6c/ke 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 s .ec0)8yrtquis 500 Hz. Assume the speed of sound in air is 340 m/s. What is the fq0crstu8 .y e)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 horn is,h2z;n,p n88o nz7:vcujvvei 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speed of 30.0 v n h8:enzpo j2nv z,,7;8vuicm/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-vdvmy8 ( 3ccr9dxs f8 object. A 40-kHz signal is sent out, and a 42-kHz signal is rs3r 8v8x c(fd 9-cmyvdeturned. 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 io/ydny thr- wx.c.0p41v;m z 1u3wcw 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 x2w(kk7 axwb: yejm8 ;Mach 1.4. What is the half-angle of the conical shock wave forjm: axwy8;b k(72w ekxmed?

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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 Mo)0 myxki0 je-ach number of 1.05 where the air temperkjxm0-0yoie )ature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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