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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://autoconfig.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://autoconfig.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,q(rwwpau51n . q8 rpt 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 fq4wg.k4i 7d sconducted 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 idg5p b 5zlezdm;f3wygn( b kn:n.k*)q6s z7u*n 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, what happens to the vel;gqm57zr s vby j16fb*ocity of sound? (Assu7z6b5g ys;1v jf* mqrbme that all 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 of a 400 Hz sound, the veloj,x2z hxu u3k*city of a 200 Hz sound through x3ukzxj,2 u*h 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 sound, th 6e yvn6f*pih(a yg3c*e wavelength of a 200 Hz sound in air iipv*n3(6* 6yfcaey hgs

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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 a vc,vxex;(n/u8:mnkc re 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 y2x j*iuhhpz(24 ay s:y.:z sj20 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.n(vw )9y oyf lchh9.cj8 g+w(x If you move to a point twice a9c co f9ln(gyyj.whw)xh8+v (s 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, intc0r0 h/1o dgc x4qniticq* :d.ensity 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 es0.ser6h h fvy61eo- source at a distance d from the source is I. What is the intensity at a distance 2d from the6f.sr e-1s6h heov0e y 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 txi)1nxha5n2 zhj :9 lul2z-aahat is radiating equally in all directions. What happens to the intensity of the sound? in2x-z )z a9hxn l5a a2h1:uljIt 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 souyw-m y4g4f0qw nd source that is radiating equally in all directions. What happens tyyg0wq- 44 mfwo 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 increaseo(; r*1x)za yedt.f fhs 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 charactx9od5i2(d)w. g yxwjyeristic of the sound increa)5 wxji (dg.yxy29 owdses?

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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 musicalb 8ilwgc ;5xb 9:v ecpa)m2i5n1 y6plx 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 musicanc z5ree,38rgl 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 1p5ifo/,c fm * h, ifza*qeo3hair 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 displace,,cct:y7.5:b a vudcey 2poid 8r:wt pment 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 sound wave geneja lmsgd6)) tkr7p89h rated by the guitar as a result of this vibration. What do these two waves have in comml gd8)7)mjhtsr pka 69on?

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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 o9axdv3 y3z w:which is 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. What are the wavelength )in00tujf0+kppw(;25rczn 3c y qvwe s of the three lowest tones produced ywpit0)j02cn ec qfvrw3 ;(nk+5 0pzuby 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 200 Hz. Whi c v9av:ru6vnc21v th.ch one of the fo. 9tacvv v1n6rch2:v ullowing 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 fundamental frequency. kdvv (hra85) s Which stat)s 8dvh(r5vk aement 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 one end and closed at the othrv-4eegyyzd qc5 -z *3er, 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 msb5-qjbz fjb;9 j 2a2wavelengths of the three lowest tones producedb 5-azs2 qmj2fj9jbb; 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. fx8d -5qjozq+kj .2xd 3fcb+ yWhich of the following frequencies will not resonate in that pi xq5+fd3jx28jy.c qfozbdk- +pe?

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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 fre;scs 6nx5q ,piquency. Which staqx, s;pns5 i6ctement 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 drim :zqo-)8 lmhzh*4jizven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. ): mhmlo8izq- z h*jz4 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 sound waves s ,3f; k nuij1xxw.pc a.vm4l/uhould 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 frequency is he1d r vub,,330bnd5txrtebb /bard. What happens to the beat frequency if t3dnb e bxbrrv1/5, ,ub3db0 tthe 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 explf p092ig5jish1gpclqhqs* , zzt h,,0ains

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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 fre x(+ l k+edmql5o*.bloquency heard by the obserxd+ *.5lomkl eoblq+ (ver 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 observer. The frequency heard b u jvj n9hs1lp4*3;rdidc c1jhpg1i85y the obserd3 s1l94uv ji;rdi5hcc1 8h1pj*pjn gver 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 decrer sv/ev8;c kb;ase by a factor ok/cb v re;;8svf:

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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 odn-di896 5ixgrp1bd2zpu ff (f frequency 45 kHz in air is 352 m/s. What is the air temperaturepz68 ddg bi2fdn9- 5xr1(ifup?

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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 sd4f3,vu o;( bwhp *h*vinic z2peed 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 3 w;:fppl8k1ni* wvtk*40 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back the*:;t wkv1lpkwi 8*pnf 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(pk fr,ghpnedc .gmw- t 1/:2s, 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 ofn iwti3.:esr w acz 2dp53rziq0:z)7lg,iy.v lightning, the distance to the lia.ineyzi iqw7: 3zgpr,wi vl3zr) sd5.ct0 2:ghtning 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 ags0mt7 )k+gde l8ie -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 splash 2.r;itl o jdkly:b3 716q5 s later. How deep is the well? (Ignore air resistance, 1d6 l; yji3: rklo7bqtand 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 wrm8* bqd5b q1fr)jd5sx f()oaave 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 airgk / qe4qj(qjn(h-2x 55t uyid 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 int n3xhali 4lw-j;3z/ qtensity $10^{-3} \; W/m^{2}$?

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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 soulf 8k ldz7 pxk3,y6o4sm/9irfnd?

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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 levels ou5j fqd.rs1+-u-tjc wf 70 dB s -f 15.u+tjw-qcdujrand 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 intensity oh5k3* x3rt6 0ifxcqy level generated by onect3ox ih0qk5yr* f6x3 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 otiy:5-.n-jko + n hc7t1pgvdbw0,kng f 6.0 m from a source that is radiating equally in all directioh.pv :jo5n-t7 kk-wcn1b +n ty0gd, gins 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 distancev2pyw-mv gtk::m-dyai( l 1; y of 6.0 m from a source that is radiating equally in all dyt ly(y k2p v:ia--vm:dm;1wgirections 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 uniformly di8onb zu8dpe+oc9 h f:;stributed in all directions. What is the intensity level at a distance 5.00 m from f9n8b uopz d8:;ec +hothe 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 fn8+ z j2mcio,l44dmtauw7 c 4srom a barking dog. What would be the intensity level if two identical dogs very close 8c um+nac24 zjwml4d4,stoi7 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. Whaj v cv92yea*lwzod 3+)t is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equallvl+ 2zoc*a)deyj9vw3y 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 po3j vy;yghgd 87)ha;, qyjwng- int source is 95 dB. At what distance will it ;y yqjh)38,w hjggga-d v;y 7nbe 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 frequenc*ip*m ld,5 bapy of 1200 Hz. What is the frequency oiad5pm* ,b pl*f 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 of an open pipe is 900 Hz. What is the lt28a* p04iplbef n- tdength of th*ta8p-lt2d n4pf 0be ie 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 reso7 ykdq.snae;m*s7 x;rs 8m yy1nate in an open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of length 2x17q *;y.rasnd8 ys 7msme;ykL?

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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 haeblma)3 t3*(.6c2marsplr*w/gj h v as a length of 0.80 m. If the velocity of sounpl *tmsvbm ) c l*awe.r32ja /rhag(63d in air 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 t9jqil m2r14pvd,m 57l fu ec:hhe 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 clov2av 3v :5 aj3lzctwz6sed at one end is 330 Hz. What is the frequency of v:ca j3a6tw 5 vzz32vlthe 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 on one end that will have a fu4y8kljc 2 k( ef)fv2h2sp *rzq8ice+h ndamental frequency of 60 Hz on a day when the velocitsy2ehv zklj2 cef8i q*p8(h+c4frk) 2y 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 thefk ,*aq(l3nm w 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 d,.g4/gprp3f ,fdard8* g o+iy-imjm 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 speed of sound in airm9eb-b5 bglv,pd+: gc is 340 m/s. What is the fundamental frequenc: bmbldgv+p,-5egbc 9y?

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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 hku: .8qi431:n.hhegnsubxha (x/e x 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, what is h/heix.1a k8h.x xng3 nqe:bs(u: u4hthe 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 frequenlkbz0c-q6xq 9je0v (ncy of 800 Hz in air where the velocity of sound is 340 mqx9j zc0qbk l60ve(n -/s. How 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 and driven by the same frl5(/ y2kv0 qtoxk5g dlc) x8a*lwngn+equency 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 the other speaker? (Th2/0xvc lk (od+g 5ay w* t8k5nqnxll)ge 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 )c.5.s/c2wasfj tckc,y n g sgh;v1-s Hz and 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 in3h+wjwx im. f9strument. If the tuner hears a beat frequencf+i. m wx93wjhy 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 horns are 6 m and 7 m respecrs 4roo1 .7-.eki sk/7cuz svrtively. What beat frequency is heard when the horns are sounded on a day when the velocity k- ri1okrs r4uocvs.zs77. /eof 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 oe6h*j- ey4vss rchestra are found to produce a beat frequency of 2 Hz when ajsy4e * 6h-vse 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,nrt +im77muni ;gt( t sound. The onmmi+ (7tit nr;gtu7 ,bserver 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 a39i jlbn)8nwdt one-half the speed of sound. The observer hears a b) 3dnn98wiljfrequency 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 oq d;* rtj+ag4bf 30 m/s away fa*j d r;4b+qgtrom the source, what is the frequency 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 a day when thb ( up(t.psmz.i/;yj 4zpg +u.tm )iwee speed of tywz.j ((i umpp imut4z)ep+.b. /;sg 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 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 station. skqcfuqrl 4 ;oi6):yary observer when a train approaches with a speed of 30 m/s. The frequency of the trainc ourq 4qy:;fikl .6)s 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 it 6aijt3 k41gios 400-Hz whistle. Take the speed of sound to be 340 m/s. i gat61ij34ko 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. Thei mug81ay 64zy train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s.81 guiy64 yzma 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 blows its 4awyvn :ky: )o400-Hz whistle. Take the speedno k:)4 yvy:wa 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 120a25/pqq6amuobh*lz3lf(f)o ka-- ff km/h. It blows its whistle, and you hear a u5lqkaop a/* zh6 (fm2qof-fbf- 3a l)tone of 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 train horn is 500 Hz. Assume the speed of sound in 7+fkw mv gk7el)aaq,bf03he-air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train wit)7e,f7lw 0fgk3 a+vm keb- hqah 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 5wrry81x z ;( glht,ju;00 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 trgr xz8 (u;jw1 lrh;y,tain 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 *ls .qx:4doq 1jy* mflan object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/slqsd4o1*q:f m *x.ljy. 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 i )t.7(yf/gqhgn6 jfd 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 Machi,mq ooh edpc7de5th2h- u--j3:w ;xx 1.4. What is the half-angle of the conical shock w7 ddoh-,- xeox2hj5ehct ;w mpi- 3:uqave formed?

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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 Macx z+x+3emrmi)tfbm, :h number of 1.05 where the air temperature3bzr fxm,mi+ xe)+t:m is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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