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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://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://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 falsey,a( jm4ph: w0f+fpsus oy b4.qfc g:6 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 dvma,8c52/yi, xpvws 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 soundyk-qfo7kewb +m3 od ,6 in 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, we.y8yneofl73sa. b.t/spwl 5 hat happens to the velocity of sound? (Assume that all other factors remain cp nyosl./.w 3lts5y ae7b8 ef.onstant.)

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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, i 0x18mm*3du*i m;k yf aapah(the velocity of a 200 Hz sound through01m8y m(*kix3 * p;fadaai umh 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 ofqinsn7n1d9k7u jom8 * a 400 Hz sound, the wavelength of a 200 Hz sound in1u* 7 q7nndkmoji 8n9s 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 gre+mle +o5nyyk 5ater than 20,000 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 frequency les nb2; 3j:auy/hy zfz7tiy4xp 8s 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 :ldfo. c8o;m0 n okm:zsource is emitting waves uniformly in all directions. If you move to a point twice as far away from the source, the frequency of the sound; l.oomdk omf:0zc: 8n 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 is /g+:hgh -u+0j i5povvgxtys+xgd30k 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 sourcew f5ua*g: rnh* at a distance d from the source is I. What is the intensity at ah5nraf* g :w*u 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)rk igs, gy3v7 source that is radiating equally in all direcig v 3sryk,g)7tions. 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 from a sound source that is radiating equally in all (a5+ med5bqktn)(m7 rywm;0 gfviok :directions. What happens to the intensity leve(k)+fr :m7 i5bmkd ;oq5wtvma (yne0gl 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 f1t+x. tm)djx,* c k18zcijvl 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 characte,*i : yuf(exncipx1+f0ogcd68 ,r- xslxwu h/ristic of the sound incro yc6sli if *rh1dw8xpx+, u:cu xnge/ f-,(x0eases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" ofrfl (/1rchgj2ixpwz6 8 2 +. maf3g9c*mwhgp p 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 "ple5/q d2 a9wititch" 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 fr m9 3 4ve/0e u15qj6zkaftd/nlflbttj*ef;,yom air 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 wavesppw 7qpy/,t2r m:of8m6 w5x3tan+l by 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 souzc*nsi s0-j 4cnd wave generated by the guitar as a result of this vibration. What do these two waves havecj *sc-40insz 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, ther u3xw4):muij de

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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 wavt.xj/r agqj 5-c,m(izelengths of the three lowest tones produced bycrtqxm.j- z(5 ,ig/ja 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 res0 fo- ppzi2s6v6 l)pusonate in an open pipe of length L is 200 Hz. Which one of the following fre-i s6 0v26lsou)pp pzfquencies 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 frequenf0:elmyjc, vp/(+ sizcy. Which statement jvc(e0ip:yz+ ls mf/, 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 4q la.krc8dl -1th)lk 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 wavelen-/rp+bdkbfj3xp p (:zi as:8fgths of the three lowest tones pb-( pzjx8dp3:abs fk:+/ irpfroduced 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 ae8e-m06tmz3-vyu 4nnf 8gp ex closed pipe of length L is 200 Hz. Which of the following frequencies will not epn mg8y-u 38vnftme 4-ex60zresonate 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 t,;b5jq udqh 9is resonating at its fundamental frequency. Which statement is correct?5qud; qh9bjt ,

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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 souzt)rg i:blgl8t *6 +nnrce. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. Th )brgn:gt68tn+illz *e 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 k7 z k1bj+ryl qrk6,ktng:+:wwaves 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 souw2taj.uz( y /snded together and a particular beat frequency is heard. What happens to the bea/2 .wt(yasz ujt 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 expla ex ues( eku5d77+p9avins

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approac-)v.54rxam3acb y k.om nzg1hhes a stationary observer. The frequency heard by the obser)1o-n m.3c zy.a g rvh54maxkbver 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. vqwyp*8 t4j/ 4 rdlna, The frequency heard by the observer iyaw j/q*v 4 8p,tnrld4s

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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 decrea5.vvsw.ra0b f zs (u0fse by a factor of0sa.zfs5 v0( u.rvbfw:

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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 ultrasonic3p3 ft;+k. qpcb* rsyx sound of frequency 45 kHz in air is 352 m/s. What is the air r.ps q*t; f p+ycxb3k3temperature?

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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 sound ing2,o4gpl obag+ q/ol, .agx5 o 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 sppj 8rtbxk7 c(m isx149eed of sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.02tci9(18x7 j4sk rmpbx50 s later. How 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, and hear the echo in 4.00 s. The temper 5u4h2 vih r11e d7d5lph9an is-y/gudature 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 dip1fpy g35m 4d qa4*dweh ot8 b3td63jpstance to the lightning 3 8db gt1ptm54hfjo 3dppe63day4q w *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 cliffafal3j2+s n0 ccbi5l ol2x/ ;r 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 splash dt3*rh jsbrj9 es+4f*ez bg 0:2.5 s later. How deep is the well? (Ignore e3brh tf9zbrs:g0 se d4*+*j jair resistance, 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 frequencyl;z7 1 fwfffdx +vik at( kro(o9g4(d8 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 airfw/n9/y+wrx6xk y3 nj itiyl y)h-w0gd0i.4y 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 intensity xl 56ryd6u5,fv 0 yhukzwv*8v$10^{-3} \; W/m^{2}$?

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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:oswm - wj5tt1g. q* ,qrdytn/ubv-k4 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 sounds with intensity ln86cady y *rm;evels of 70 dB and 40 ;nd8yc ay*m6rdB?

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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 10x 8q;*tyihkw ;0 dB. What is the intensity level generated by one enginet*;yk;q wxi8 h?

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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 diy-f;jas a kc-;ggh eh/3a0w7fstance of 6.0 m from a source that is radiating equally in all directions isfja/hf- ;sy7 3g-a ;k g0ewhca
$6.0 \times 10^{-10} \; W/m^{2}$. 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 radiatin32+s na 2zod fsl,dl: 0c:hvprg equally in p0,oss rdl:z:lcn 2av 3f2 h+dall directions 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-/ ,g dxxh wmmwpkq4*/x;p) pi power, which is assumed to be uniformly distributed in all directions. What is the intensity xxq)-hpdmg / /p*xwkm pi4 w;,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 bzjf m6:fi11 ct9g b r8q1nab*would be the intensity level if two identical dogs very close to eb18f6gr1cqz*9if m1:bt jbnaach 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 px2) ty5x6anyintensity level is 60 dB. What is the intensity level (in dB) at a 52yxaxtyp n6 )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 sou2ej*wr2vmex( rm :,mxrce is 95 dB. At what distance will it br (xw eem*vmxm:j2r2,e 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 1200 Hz. What ivd q(k0 83ppjcb-oj y:s the frequency ofv 80: kjqpc3(d-joybp 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 harmonihbq j8;4 cgy4zc of an open pipe is 900 Hz. What is the length of t4yj4 qzb8g;h che 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 opebebys dvfx -aj0*,nm0 )cb43 yn pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an ope,m)fc 3 4bnbj*e-y 0vxy d0sban 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 mtvy krcw/a 1k-zm94v+. If the velocity of sound in air is 340 m/s, what is the frequency of the second harmta kmcry1zvk9/w v-4+onic?

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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 temp,lc7 9 78pibuav -vpcg w,wf.*-ys hquerature 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 en+ 2zdo39q-b cxel2fvsd is 330 Hz. What is the frequen9xsedozvf -3q2cl+ b2cy 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 on on 3)qdln0zi5v8m g 9emle end that will have a fundamental frequency of 60 Hz on a day when t zdvq 3mmelil90)g58 nhe 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 wherb 0heta(1ow62c-wvtie 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 m-afme d:j +o)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 ioo7 yszani*k9+ 3upu lc6 rj t7lb3m*4s played when the speed of sound in air is 340 m/suo * zucy9lpj tbk7o7r*+3i643sa l nm. 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 of the same length: one is open and the other is upz+up1tq u l m *ft:5,e .(v8bbzxr2jclosed on one end. If*x vqb 2u8eu z(r5pub1,.tlmpzf+j :t the fundamental 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 of 800 Hz in air where theo.tonqm/fyi c e y/::dd2l(k/z csl/+ velocity of sound is 340 m/s. How much farther back would sour(ld2qt o/cnz d m/+/:y:/l soei.yc fkce 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 frequency of 50j6ulifyhi qyhbxsi*(6 v 7 ,,..p bnx.0 Hz. If thqusi*xhyi6 nh7y6bxvl j,p.i. , fb. (e 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? (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. What is the belh)oe+ nwx) rbg-k5z dlc;f/ .at 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 a22vxe;w3jb p**jx 6is h0qlk e 550-Hz 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 thexih*q; 2 j 6bxwej*3lk 0e2psv 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 aneaj r2ug8qo dyf1c+d8t1c (3xd 7 m respectively. What beat frequency c 81dxqo 1f y+8gedt2u ra3(cjis 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 twoh3 j41+ :fzj ukypkec5 violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage changpj:e4zc yk+j3h 51 fuke 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 statio,q86d pd cvxl5nary 1000-Hz sound source at twice the speed of sound. Th8q,cxvl6d5pd e 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 5nbznw6c imy(k(q2k2 stationary observer at one-half the speed of sound. The observer hears a frequency q(w b(n6k2yn c25kizm 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 mov7nanklu7 m5(dwq8tt3 es with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 3 tndlm 5qaun(tk7387w 40 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 n/ .o e 8-chpf-yh8-;nhbeezp a day when the speed of sound-ne8 f-o-hphnze h; 8yc/bp.e 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 stationary observer when a tr no. qqgd*0l(lain approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hq nd(*llq 0g.oz 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 5( hmgcq fggs t.o5)d.its 400-Hz whistle. Take the speed of s g5tsgh5 f d()oq.g.mcound 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 stat bjz a5r f1df;z4kic;k y/z s*:mknal1;7+qqpionary train. The train blows its 400-Hz whistle. Take the spezs 4q/ 5*1zfl7jqfay;rp: id+ kc;1kzk ;mabned 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 you at 120 km/h. The train blows its(q iz m,xsp7zrt heg pip38g.5-/nf z5 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequenmpzh3q 8se7p(n5tg/g f, .z-rpz ixi5cy 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 atf(9pa. quc 2hq 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is pq2ha(qu fc.9the 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 ttzv erz1z0t,7he speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away f 7z0,t tz1erzvrom 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 hw va-dn:nr3f:; ijk+ bp18vshorn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is thv8n;vsn-fa+3:pk jh w rbd1i: e frequency heard by an observer 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 i0q8l;wl2t3 ee/7 wletn/pviu s sent out, and a 42-kHz signal is returned. Assume the speed of souuee30wt/ w 27eqi8/ ltvlnp;lnd 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 produced byj rswkf w808i9 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 ofgfb n +d/)2 0: 1qu: zmmcvfcfku6qrf, Mach 1.4. What is the half-angle of the conical shock wave formed?q6, :vr f n c)cffm/zd+f u1qg0bku2m:

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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 jyj+jq7n 5gu.bdt0e/States to Europe with a Mach number of 1.05 whejd0jq.5 +/ tn uj7egbyre the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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