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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 false sf. tt2p6n0kcpjo h,(itatement?

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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 thr kl 5*yiqp6y wz-gfad4lg )+a-ough

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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 .mupvh 3 kh:1ra 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 happe/vw jvw/ed4u fqc58)o:e7s hu)ug oo)ns to the velocity of sound? (Assume that all other factors remain constant.ov)/do/4ue s)8fw5veugc o7)jqhw :u)

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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 nk6 y) zdh1zn3a 200 Hz sound through air 3dh1ky)nz 6zn 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, the wavelen /r1n;wwbk,at gth of a 200 Hz sound inrwta w 1kn,;b/ 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 20,0xe6-p4 mh)z. d pgkk/j/l6-owqwl;g zphts 3.00 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 are calledfui9es jd. s eyk8e):g2 w0ls*u)c o-h

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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 in4l l(kduv7l4lm ynm;gm7j4v 6 all directions. If you move to a point twice as far away from the source, the frequency of the s7(g44v6jnmkl lm4 ;mdy 7lvulound 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 ym u-oa nx5f6g5yb3x6**mfy js 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 fo7 4l h,sce voiz+* e38p3corerom the source is I. What is the intensit 84o7oe*hsv,zecic3l+p re3 oy at a distance 2d 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 source that is radiating equally ivfaiy k wi,920wfq23 fn all directions. What happensfi i93awk2wq2fv,0y f 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 fg yl dqu:d7 .jeo9(ocw5k4rf5 rom a sound source that is radiating equally in all directions. What happens to the int o e w59(4cdg. fqud5ry:7lojkensity 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 a dgxm(:8g/ -2 yyidstbecomes 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 char1ttz1af-k ug 8sm9vhs/7it, oacteristic of the soundh97ti1gf mk18s/-vaot,sz t u 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 nypo0a+mx+ bt9 0cp7w rote?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the wk6k z , ;nvbws:/p7hrk*faf2 "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 air iv. f1wgezw (i8nto water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displaceq ym.bx7/7jqm ment 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 so+hexoa660f ixojw3) wund wave generated by the guitar as a result of this vibratio)o+ha f63wx6e w iojx0n. 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, thertx;/ z/3l .msi7 5efwlz8bceu(yh6g t e

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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 zubf9p; k +puh;q 5vj)oe c0b ix+6p,nthe wavelengths of the three lowest to6fqz+h,n ) 5 pxc;;0vp9uokp+u jibebnes 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 pior l3 zlp; k4ra 264tk8lfx:lope of length L is 200 Hz. Which one of the following frequenci2l p6; txr8l:kolflz4ro 34ak es 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 resyyg3r h +.o2a n-i;n y3o3zhogonating at its fundamental frequency. Which stateme3grn3 .gyh3aniyy2o- ;hzo+o nt is 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 oo)vow x,3lase7. ch mncq20w;ne 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 lbpe hp0p +n x/jgc3z ,-0x;cjeowest ton;+ppj0 zege pxh cnb jcx03/,-es 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. Whh/qy 4jb.oe. . ,nowgsich of the following fwg4./qn .hoy.je,osbrequencies 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 c b09t7 qx i(kc7ek-tw3pw. yralosed at one end is resonating at its fundamental frequency. Which statement is t 7.ibw9e(ta7pk-rcx0 qwk3y 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 bqjbmb. d4h z80 ma lsl;;94jkspeaker produces a tone with a frequency of 204s;j bmal h0l4dzkq;b m.9bj80 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, the two souq4mmdvn8e kk. *lfb3(wojt82nd 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 togethero-aw w .j/d a/offc8j+)vg0pd and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones w+co8 0f-j //jfvao.ad)wdg pis 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 exp46k rwurc,qw 6lains

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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 obsh-- oul3v u.cierver. The frequency heard by the observer is-o.c-i u ul3vh

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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 stationawo 4ucdu7-2nrc);vfx ry observer. The frequency heard by the observn4crf)cd2wvx7 ; ou -uer 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 will decrw o(tr5dfg+y ry v5-x(qwrzn1cv1 (+pease by a factor of: g1xn5(q1 yr(vw-r(rf cozw d+v5t p+y

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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. What4am(u10 sxf qy is t0 yf14xamq su(he 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 spe q:)*expdg08lp(9fdbom0p bu ed of 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 shriek mrs4 r3lq+qd2 6opo4 twhose echo reaches it 0.0250 s later. How far rrqo36 4tm2+od splq4 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, and qy(,bb4fz . rbz k4g gx0diw)(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 lightning, the distance tot, c;a j7(ys fk6(lhh5krnh2 t the lightning stlkh5 ha,j(c27; st k rtfnhy6(rike 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 ame/g qp 0l,3ju r+5jxz cliff on 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 splhu449bmbhve)wt76 g x ash 2.5 s later. How deep is the well? (Ignore air resisg9 7e6m)ub bw4 4hhxvttance, 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 wave of frequency 500 9np*w8kxv6y4*hye jhgvo lj errm.30.f.,jaHz 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 airb8qy7 1vmg .huo8n p0e 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 in b0 /d9 hq*6/9lv-bwddzc kcchtensity $10^{-3} \; W/m^{2}$?

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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*ygcnrg .2pg rd,-lt( 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 soubccyp3k: tal3ak) i((nds with intensity levels of 70 dB and 40 dBa3cypik3)b ((ca :t lk?

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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 garager3v m/e7 o6vo gwn)t8lsan; 3h88yjep is 100 dB. What is the intensity level r8e7n n)oo8y 8 ewvlasv ;3jp6g/3t hmgenerated by 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 6.0 m from a source that is radiati1nogigwv olp ts 3:qldl*47a23 rc0,b.b,u e gng equally in all directions ioq*t:u al7w lb32 , ggde glvn10,bricpo. 3s4s
$6.0 \times 10^{-10} \; W/m^{2}$. 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 equallyowyg305p 6jf x-. emzo in all directi60. 3 foxw j5eoygmzp-ons 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 a8gg:i fz4 e 26x*pi32rumygc1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m fromgxar3i z: eif g2yg624mu8p* c 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 distancz(hcts(0szvr:g,, +1afi-zfy(9b5w qmxgjue 5.00 m from a barking dog. What would be the intensity level if t,+fb iassugzhtxrz,m c w1j(9zgv q5 fy -:0((wo 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 soun hi1rft9cdh u:*y9 d/wh(7xi ed source the intensity level is 60 dB. What is t c i t(hedu7ihxh9/w1:*yfd9rhe 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 fro oe,4/owf-90uorzf 8t tyspi)m a point source is 95 dB. At what distance will ite0tf 49swi y8-poutzo) ,r/fo 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 frequx kp-:5i.)dwntmv; :o sutz/l ency of 1200 Hz. What is the frequency of t-w )ip l vu:;.5 odz:nxmt/skthe 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 an6pxx k0tch-n ive5u;0 open pipe is 900 Hz. What is the length n;ti506 -vc p uxxe0hkof 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 opetdnw, u1 h5vl qvj9p012dmrb0n pipe of length L is 400 Hz. What is the frequency of the lowest tone that bjduhdr,m1p 25nq00 v1t9vlwwill 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 92.kt* jkq cou uo+c2zlength of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the suo2q9 2+t c.c kj*zkuoecond 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 the temperature j tnir9kg8x9 3 .8 lk7edypvw7is $20 \; ^{\circ}C$. 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 330 Hlb( c)uhd+gz :z. What is the freque:+) buhdcgz( lncy 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 o. tc/w 77noacun one end that will have a fundamental frequency of 60 Hz on a day when the velocity ofncw.c 7ta7 o/u 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 wheua-v*0, uj 6ohehsuk+ re 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 awka:12a xi,bn55oggi room 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 spe7 nwp2ju gv sg89v3y1eed of sound in air is 340 m/s. What is tg n3g 1 ue9vwpyvs827jhe 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 of the so2jlx 7i8 hkn,ame length: one is open and the other is closed on one end. If the fundamen jx,7h8k2 inlotal 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 ofopr;.ewn5i8; l-sbvd 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would sourco8wsb vlp;-; i5r nd.ee 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 and driven b gg;* +kurhafdy-: i(by the same frequency of 500 Hz. If the distance from a person to ong*y;bh-g kif+a: r(due 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 and 444 Heydn )f mgqqgo0zwcu6/j, 66/,q4da zz. 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 g +;mbdi-o 5 mhc5lgb-tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the instrument?b+g-lh - mg5b 5mi;doc

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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 ts3s0)b iz s6w)3djwj7 m respectively. What beat fre)tjj dsw)06 siw3 3bszquency 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 z4kteacc6 lqat9thug *.(*6k 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 wouldct(k4 a l*tqgk*9e6c.azhu t6 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 ifm3oh0cyv zg mg0;ich 09:e9sound. The ob3 goh90ihcg;c0fivzmy: e90mserver 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 stati4jfff8 +; luyeonary observer at one-half the speed of sound. The observer hears+jf8 4u; ffyle 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 movesw;kbughij5.vm v )d2- with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 340 hjb; di -vg2wukv5)m.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 a1u m1d-os ( b59tlpg 7otl2dent 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 is7 92-md l st1dtolp1ngo eu(5b 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 d z7xqnmsv+ 2(heard by a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz andsv2 +d(7n qzxm 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 i 2 mn4kyr5e46kkygyktf *: q)hts 400-Hz whistle. Take the speed of sounmq*k6 4k 2ty:)rk k4eh5fy ngyd 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 train blows its 4(h,dgl b5u f7ar9vj8,s: tnnn00-Hz whistle. Take the speed 5u,8fnlh9:n7atrnvbds,jg( 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 y pv3j :pi*g/z 1b03f:j nmjjkaou at 120 km/h. The train blows its 400-Hz whistle. Take thpiv af1/0nzj3j:: *jj bgk p3me 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 blp 5sd8pqz1da:ows its whistle, and you hear a tone o q1 dz:pdp8as5f 400 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 traip:3p- iha un,yn horn is 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 moving away frop:3ih n,upay -m 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 traisn jy itf;/i+mc p6z 0c2mb7lbj5+.vzn horn is 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 3t/c c2ii 0;b+7jb5pmlz+my .j 6fnsvz0.0 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 mx:h)g e6q(euout, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast e) g ehm:6(uxqis 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 aqu9a3kv3+f; r7 yislv 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 shaoyg 5.zc*o 5f k2rc/i/qi+zcock wave forzif 2/crozy *qgo/+k5c.5icamed?

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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 Magfkb;ov u7tm: h xm82+ch number of 1hk+vx gob7f: m;ut m82.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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