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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 a fa5/yy5 i7bgah5fi9ck hlse 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 conducte4 cgrl79j,5 w,fah ejnd 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 er y/w5bdo1xc)6z:lv 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, what7m:e if3 ats+s2klp 1b happens to the velocity of sound? (Assume that al s b2+limk:pst713eafl other factors 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 of1b q8pxpp l+2ezqy h5:v9xn +u a 400 Hz sound, the velocity of a 200 Hz sound through pv+x5zxy 1b2que8 qpnlh:+9 pair 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 wavelengg;hm,d(e5aplv xus8 5th of a 400 Hz sound, the wavelength of a 200 Hz sound i es8ulxgm h(p,5 ;vad5n 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 20,000 Hz areo atu7a)w 5-zpz2.p nwl6fyy/ 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 l9rik1gj ++s x ymwrp(,ess 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 uniformly in all directions. I-i-8ub qxp9on(z 3jku f you move to a point twice as far away from the source, the frequen ik --3z(xu9bpo qj8uncy 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, intejk+3 6ut. mpvf* iw+quzq*f i+nsity 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 atnb(7um,ks 9-j6oef la a distance d from the source is I. What is the intensity at a distance 2d from the ,nbaosfe76 (j-9l muk 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 source tha.rlfoe;;tiss 0,oa wi+r3e1tt is radiating equally in all directions. What happens to i;1t0 t+sl 3r f;a.ro,oeeswithe 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 disty,84 pz*nr;;y4bsvnj mys. o cance from a sound source that is radiating equally in all directions. What happens to the intensity level of the sound? It drop ;my,y;.4cn4s oyb8p rz*jnvss 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 increas,6m4jqkh d kd/es as a sound 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 a speaker emitting a pure tone. What character0piuqneq0th/l5;)sl fdqif:2 mz r 9 :istic of the sound incrplqq2r m zffti0:9 /qs5n : e0dhi);lueases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" k-v6-cey0wnyg ,h2i tof a musical 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 mus,. yy p/ cpn)y0t3jw*3dhuufe ical 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 zcp2bo2i2t(syfq-1 wv ,ty 2wwater

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacementr/1 rb+ml)int waves 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 a guitar string and the so4iw y;)jumwzhv )wp rzvq(0.6und wave generated by the guitar as a result of this vibratio6j vzi4pqwhyr. )uv();0 mwzwn. 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 (kx*/+n tnptt 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 length L. Whathatled+tz pycb 09j 0:+mf2f*85l efpcp7u x3 are the wavelengths of the three lowest tmclp5fzj+ape0yftl7 0 tp32b e9* :f dh +uc8xones produced 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. u: h2z:pbwca 200 Hz. Which one of the following frequencp :2.cwu:bzh aies 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 funda8h7o+nx u t5.6 qrsoqx xbi-ls94b3x tmental frequency. Which statement is correct6 9sbr3xoo-xh.7s8b+uxtt q nil x45 q?

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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 d kjv setd5ax4d.(2)lat one 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 x; f+o/a.4bekeh;mff,i 4zse three lowest tones produced by this pipe?.s/ kf4io m;fb+ z;axh,f eee4

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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 zb/g; obc ze2i4*bh w5200 Hz. Which of the following frequencies will not resonate inib/4hcwb5 o;b2ze z* g 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 .wo-lm vri.0-c(hl w1jle0svis resonating at its fundamental frequency. Which .w c- jl0lws(1 v-rlom0 .ehivstatement 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 source. Each speakens:lnh,ipq4byh e(hw u g5 6)2r produces a tone wit)e5s(nuhhp6 g4qhy, 2wln :ibh a frequency 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,0d8f0dq lavmoy g-8x,.f95-8qfk wnxzz vs7 p 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 sounded t zaiattpmgvk..7yqj)o7vfr 2:4a/ s9 ogether and a particular beat frequency is heard. What happens to theviaga.a7 2zvy./m:4s9o k)tpj q 7ft r 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 explainsf0s o)9lksz e; 7)tnlv

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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 d,qnu (d 72renobserver. The frequency heard by the obseqneu r dd,n27(rver 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 fromgmv5 )+qng ;3x;qdsuz a stationary observer. The frequency heard by the obserzx5d+gm3g v;)n uqs;qver 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 Mhjssi*ify1 (gt *dw.)ACH-speed, its half-angle will decrease by a facts 1is.jitg* fwy(dh *)or 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 i7,xqydk 2dg,mn air is 352 m/s. What is theg72dd,mxqk ,y air 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 gwtf2 + bpq gvs)q3xef ,+-5tkof 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 asch ,06ajf2mn ir is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the obje a2mnsch0j,6fct 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 ju /kh tx,ov7y: 4ruu)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 lightntuy38bw ucs0 ,ing, the distance to the8 y 0b3wcsuu,t lightning 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 from a cliff on a day the teu4 dxxgon+w + /bnl;9xmperature 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 th6bdlgf 3: mw73skc9mncf l2r)e splash 2.5 s later. How deep is the well? (Ignore air resistance, and assul:wkcc3rdmnf6m l f7 3g2s 9b)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 sound wave of frequency 500 Hz e4ut+ qbo6j2/a kxe0 -mgc jo5is

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound traveling in airou51xq t0w () zwk9ksk 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 l 2q s 68c2j;lwpsq cqsv0c-.8.qm2mhx /abixa sound 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 intensityr;0y spg ksn 7ae;8bfvhm1.; +ef7wsi of 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 soundskaoxxd +4f m9 lif-*-9efyg7q with intensity levels of 70 dB and 40 dB?ydofm- ifqk xl 49x-+*9 aef7g

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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 engi.o*4g t tpla8vnes in a garage is 100 dB. What is the intensity level generated by one eo l8.4vga t*ptngine?

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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 radiatiqle0 hagz , ow: ffm7:78rxqnpn+mj44 ng equally in all directions n:p:nljwm4f,f4 q 0h oa 8m7xzq+rg7eis
$6.0 \times 10^{-10} \; W/m^{2}$. 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 distanc(/eil te *a,pre of 6.0 m from a source that is radiating equally in all direcrltep,ae*(i / tions 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, whic 8yy0wdzgqbysl6ge a (i7 a62:h is assumed to be uniformly distributed in all directioazgg72y8 qay(:b e6dy lsi0 w6ns. 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. l iq:8d;xkqn* What would be the intensity level if two identical dogs very close to each other areqkqdl i8x*;:n 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 1he 5- s nghe75r;6esu nem-sithe intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source nhn 71muhs g5e;-eis6r5see- 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 dista08u ;fd5hzh eence will iz ed8f;hh5ue 0t 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 1 r)at 7knufx v7t09eb/200 Hz. What is the frequency of the7t vtf7 xuea0bn9)/rk 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 pi wy38fipbi)vf sw712qpe is 900 Hz. What is the length of thewp bysv2q381i wfi7)f 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 Lhtxz k8 g2x1qyph-;g( is 400 Hz. What is the frequency of the lowest tone that will resonate inx tz p(-;2xyqgk18 hhg 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. If t 1f;mx 0zny5phhe velocity of sound in air is 5xz0 1mfyp; hn340 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 rv*,ffbvgthr6z.nxz r5 +t 4i( oom 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 i2(6w ywu tqgx*s 330 Hz. What is the frequency of the third harwxt6gq* wyu2 (monic?

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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 dnp44 wzlcz+0 pipe closed on one end that will have a fundamental frequency of 60 Hz on a day whzp+d wc0 44zlnen 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+knxp lyni y,1 7p 1/vsarmrb5 amf/54 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 ro wyaz*ms/ge1z u)o5b (uh.f+ rom where 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 when the speed of v8uk2m.vf -i/hqbhtq8 r*z)y sound in air is 340 m/s. What is the f hkt-zq.uq )88mvb r/hyf2v i*undamental 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 on oevb :qn ),(iwxne end. If the fundamental frequency i: wnx v,e()bqof 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 800 Hz in air where ysyyh+9 o,3 mb .ynu0fthe velocity of sound is 340 m/s. Howm. 9ny yyuh+ ,sby0of3 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 side apww4jw.-gvzjc*c;o*x ya +s/ nd 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 th; xj/ w- *o.y4cz+c j*wwpagvse 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. What7 i; ,tigpr;te c)b8ws 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 o f1bigr3/3h,1lrst2im r3 mnu f a musical instrument. If the tuner hears a beat frequency of rb,12rgi1srhlf n 33mui3tm/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 sousv.9zz9,kj0g1 1v pxtc/ybav nds produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day whezpxs z c/j9.y,b a9vtv0v1gk1n 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 violiszgs9p9mo (,mgw(r 33 e yhz9fns in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. pm3szz3y9 9 g(sh(wfr9ego,mWhat 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 eosc4uy2ekokk( 2r8),eh0l fthe speed of sound. The observer hears a frequen)(4cfrs eyouk2e lko2,ke 08hcy 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 obserg -41gz8 vkj f/nixu oj9:y6dnver at one-ha:df4u6zyv-k gox/j819ni gjnlf the 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. If a listener moves with a spe a6u,l) 6bsj9fpumfq 0ed of 30 m/s away from the source, what is the frequency heard by the observer? (The soun9squul )6fb6 afp,0jmd 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 sir;tqt x2,x*vnuen. 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. Whatxnqu 2* v;,ttx 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 obse;*xpia o/h e)5 eh;:0tkfti:. lmoyctrver when a train approaches with a speed of ::5h/x;ik loftaettp. im)0;eyo* hc30 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 you at 120 km/h. The train blows its jm ,zr,o.m 2b zgtyu9.400-Hz whistle. Take the speed of sound ry 9 g2j,uoztmm,..bz 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. The ) 8;cdupof -;ufxu 6g:zkkag) train blows its 400-Hz whistle. Take the speed of sound to be up;-; zcagu)do8u6:g f)fkxk340 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 f vtt ptv m3clxy9*h)(3rom you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. 93vvh3xt my t)*p(clt 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, and yo*p5 e-wy3qnllm: k;o w)fce)yu hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequ- *;3l 5op)) wmek:eqfnlcyw yency 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 in air is 34/n f71jd))i2rhtns9m8fmdf q0 m/s. What is n29dmi)h1 f) fs mtfj/nqd 7r8the 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. Assume the speed of sound in airc y 6qg/9g5zrt is 340 m/s. What is the frequency heard by an observe9zyg/rt6qc 5 gr 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 su r4s- pu ,s.:hfwsu*g0i4vn8y lqc8v ent out, and a 42-kHz s4ci gqrnl .:4uvs h8-w s fu*v0ys,u8pignal is returned. 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 producp z:g bh8yv2w0ed 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 u -61:c uj5p2hgjyutujk.4krthe half-angle of the conical shock wave formtu:ruu.k- ykp 1cj 526uj h4jged?

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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 2 hx bep3b(oq9k4r; 7:;prqoxma9 h esfrom the United States to Europe with a Mach number of 1.05 where the air m p q9okesb (ohbr93ax4 ;xe;27hrq :ptemperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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