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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 stateml1 om7pk q)bz:ent?

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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 fast-r-rf+q fse 0test 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 a steel h2;e7s6l80puqwdqonl/k t b) 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, wh)jtp35nlsd jy m+u+mhf 4w63w at happens to the velocity of sound? (Assume that all other factors remas p6j+5 th3)l wmfjd4ynw3+umin 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, t ku4 ,;wbu+jvdhe velocity of a 200 Hz sound through air4v,wd u u;+jkb 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 wavelength of a 200 Hz souncq ef.:s7w vx5d in air i. v 5f:xec7qsws

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 are 97h8wpy 3a1sg focq:pcalled

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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 calfd 2b-)pj:9c3wvvx )b/mka* ru vcx- lled

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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 waves2+vjsfw* u9x j/yi 0id uniformly in all directions. If you move to a point twice as far away from the source, the frequencyij+fui0s y d2jvx*/w9 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 wavmu/b/nu+oqy+ uwo23x*(zc i ves, intensity 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 at a dist(x0 .:vhck g+1kdbyyjance d from the source is I. What is th1 cdxy0:(jk gv.hkby+ e intensity 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 d, ; put1/zl6k;t7nqs t sr*cqequally in all directions. What happens to the intensity of the sn;/u1t t76cqlqs, tpds; rz*kound? 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 v dx 23g/ lncsye)nm4.from a sound source that is radiating equally in all directions. What happens to yls g3)4nme /xc.d2nvthe 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 followingc1ar6/ st g;53uaqsc a) j3kcl increases 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 l 9eqx 6+)fdqca pure tone. What characteristic of thf+q) deq xc96le sound 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 musicajaryl6 n 1pkfqe58o:: b(m) jul 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 musicalfe1ok, i,pz1(l 4myk t 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 4jwrorh2(*pwt stw4-3la 4zminto 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 t ghl0famkvx5n2e ;2g :ys6y3ment 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 genera/hjt g+.-wshoo1 f2kated by the guitar as a result of this vibration. Whatoa2kf 1ojgh/st.h w-+ 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..3ir) n)lvja2orq fe 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 arrepzs nvlth3/j-3vr q8 ,5*6oa+hz zye the wavelengths of the three lowest tones produced by this piph-s,+rhvjerzy6a5zz3 vl /*p38 t oqne?

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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 pip 211pgdrxrbof2dni8s.z s:60(a 9 g1u awvlw pe of length L is 200 Hz. Which one of thpg 1ilgv1bz2x(o6 2.wsd89a frdps0 uwanr1:e following 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. Whic7c4:u6z 4m xgij2,l - v2uosskpa 2gkgh statemen2u -s2zok gum 46ja,i7gk v:xg4 pcl2st 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 od, 9jkx/i tm6 13cxe z:elb)yjpen at 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 three lowg. 95 q:cwe,rly4dsp restrdg ,q .c4ls:e 59yrpw tones 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 0+r+r obkm4 kris 200 Hz. Which of the following frequencr++ kr0m 4robkies 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 closed at one end is resonatintt)r ( z. psj-qr/ nxhip1p7o0g at its fundamental frequency. Which statement p rt0)1i.p p /7t x-hqzo(njsris 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 two8yntw bvu(hri.p7 78v speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day whe .p 8u v78b7nwrihytv(n 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 sof bk p(z*ntp3*und 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 a particular beam,q ro tgx0b8lw;( ;ilwz5m+qxi8l d* t frequency is heard. What happens to the beat frequencyxl ;q *qtzold;l0(i8w+ig bmwx5m ,8r 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 exxx314u u) b 1jbuxt4brplains

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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 obs(igdcvi7* jl/erver. The frequency heard by the obsv*7d/ig ic( jlerver 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 freque0nausy ih9j/;l ,p2hkncy heard by the observer,/h i;pnsj0au9yk l2h 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 r1jzmnb) ih*ye v 1yld(k; 1p3to double its MACH-speed, its half-angle will decrease by a factor of:r*mh; 1z)n j3(1e kpv1yybl di

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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 so-+y /oco4qn 3l eo)v(ywi ylk1und of frequency 45 kHz in air is 352 m/s. What is the air tempera1q e-y(vnlcwl)3oi y4+ yo/ko ture?

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 the30/gco (;gv fzq5np1q9 he ytg speed 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 inymz:b ,ka1c5sa 0tu;j air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the o5 a,k0azc yb:t;j1ms ubject 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;3 cevjfoo2.-t ucnj6 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 thx,a: m+tf ch)).xdsjre lightningh:mr.)xjdxt ), as +cf 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 on6cr* (jrt 7bbq 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 wellrxf,sj546 eeydp8b/ 3+vd zip and hear the splash 2.5 s later. How deep is the well? (Ignore air re3rd8bpde5y,zef+xj4 pv6s/i sistance, 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 frn v(b6xf1;pc mh)bbo2hfj7 /k equency 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 ouc0wqq07*vr8 c i, bg*qkh5i xtw. o9at $23 \; ^{\circ}C$ 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;41guttp jl;j:sbd2z level of a 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 intensity of a 70-dB sou 9qi1;,zf(eptr -xtsmxq/i mbir9 f 09nd?

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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 souns8 ta1t1vvxadr l7)/m k,bv 3tds with intensity levels of 70 dB and 4vs1tl xb3mr,kvav d78t /)ta10 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 epbeg(1h9 -vk ingines in a garage is 100 dB. What is the intensity level gene-e19hp kvib(g rated 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 dist.h oc v(x f2v:np1:.rv bg9l i9nf2zusance of 6.0 m from a source that is radiating equally in all d:ufconl2h. i1s(9 : .fnvxgpr b z29vvirections 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 sourcef x/e,( q8vcrk that is radiating equally in all direkvce ( xr,f/q8ctions 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 mw0fibm 8rqc6. W of power, which is assumed to be uniformly distributed inm6ir0wc f8b.q all directions. 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 d:bvnsx2k g s(p /u)x7jistance 5.00 m from a barking dog. What would be the intensity level if two identical dogs very close to eac n(spkvsugx):72j/bx h 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 q0ovc:k.s /stintensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the .v0/o tskqc :ssource? 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 poin( v*nj )kuttj1t source is 95 dB. At what distance will)nj tt1kjv u(* it 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 haor0fa*1u) cz40 ojrpw;ud)o as a frequency of 1200 Hz. What is the frequency of the fourth harmonic?z o0o* w1;a)ra) 0ucrdu4opfj

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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 Hv)o vw6chbhd6 4 3m9poz. What is the length of the pipow mhvbd6c6)po3v 9 4he?

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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 rq8 g4jlse ps;9j.act8 esonate in an open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an o.j4;98e tl agcqs sp8jpen 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 the velocity of sounb yg5a on7*wl6d in air is 340 m/s, what is the frequency of the 6ba5o7 *y lgwnsecond 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 bp .bo09 vf,yatemperature 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 is 330 Hz. What is the u 8e0u/a nf0w(bvb494nas0lrhue bv4frequency of the third harmoniav lu 9nb/uu w 0v00s8(ee4fn b4arb4hc?

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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 onu cf84u6 r w(,0q.tz3wojvion one end that will have a fundamental frequency of 60 Hz on a day when the velocity of s0(wf8unzi6 jvc.4u ,rqw3oot ound 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 rogzvp l)gvqo/g8.4zj ),/ 5gneu 2nyc gom 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 room where the ,e3y*taf.;+e ;r y9oejrzbjj 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 048(r sdvr s3uz.75 m is played when the speed of sound in air is 340 m/s. What is the fundamental freq4rud38zsv(r s uency?

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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 in az iz)qcv2g6dz, 0.is open and the other is closed on one end. If the fundamental frequency of the o d zn0i2z i)ga6,z.qcvpen 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 freqjr*/wt9sl; is uency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in front of the sources would hear no sou9*wl/;tj ri ssnd?

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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 frequenqx:orf c f58nfx y8p76cy 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? (Thf7f5pxy ro88 fnxq: c6e 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 frequenci0fwe)w8r ;ub8 ziea0ces of 440 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 frw bqzm6h.as7a-k( vg ,equency of a musical instrument. If the tuner hears a beat frequency o -,qvwk.gamsz ( 6a7bhf 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 respec z)x(ca0lv ie4oo om4,t+nej9tively. What beat frequency is heard when the horns are sounded on a day when the velocity of sound is 4 oxt0 +jn ovz9aoiec4e(m l),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 orchestrvbf :z5 3c1cspa are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What z bfccs5:3pv1 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 spe p 91y5r675jwwchegq yed of sound. The observer hears a frecyj9pw51wrgyh7 6 eq5quency 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 o6y /d9o6c*+l;k:ymewojlt v/e tih5kbserver at one-half the speed of sound. The observer hears yl:+/e96y /dm v k65tjlc;oihoe* wtka 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 mor;q ,c rw56kjoves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? 56rw; cokrq,j (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 ebtjt3 +7wn, rw5vi:vis traveling at 35 m/s on a day when the speed of sound through air is rw, vv:t+twn35i b7je 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 tfa6u d7oc 6m0arain approaches with a speed of 3auca6md6 0of70 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 4 -.xi3f3+efaj vkvh(k00-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do -vja. (fvi k3e3xhkf+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 km01sx z1i/dtv 2f9kcnsa -e ip (zbmboz6y:6d//h toward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency s-z0cm6(s1iedz x 9p/ 1 ti/ 6aobbfvz2n dy:kdo 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. Th,7lz 3ofj f,l jgt8a +miaq-x*e train blows its 400-Hz whistle. T+3gjj xfllt,7o iz*a-, q8f maake 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 k,jgc9up e)5 7 .zzksv,sq:z bcm/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. vz:s uj,gz,e.zsqp)b57c9 ck 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 504ra;*gahm5bi 8lh u-w0 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heaa*-;lwuhg5 rm 8ihab4rd 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 pfnq( 0*8ba0en-hsof hpm9:n abj: (bsound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a a: f0n(pn*eon bb-amb0qsfj98h (ph :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 4ib5- -qil 6ulpqw *so70-kHz signal is sent out,i 5l7pq-*quslw b6o-i and a 42-kHz signal 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 wav (h8wy,( nt bjhk-6i9.o-fu pqcsocg*e 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 spee /)r 9xahtp)lod of Mach 1.4. What is the half-angle of the conical shock wave fortrxph)a )l/ o9med?

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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 *iir q)n3 a6kmhap6:0l.pszh from the United States to Europe with a Mach number of*h6pn:)h pra is zq.mk06l3ai 1.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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