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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 pbn7wz r )y3h y8xwe1u46qi8f a false 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 fasteste6q1ts4wqq( 0 y6(c,edjbwp o 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 s((5qpd llo-pu teel 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 increb( 7ah:qmz 5paases, what happens to the velocity of sound? (Assume that all qa bpm7(az:h5 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 velocity of a 200 Hz so4gmyh+au p vj9 x 7+,mz:p17g y)ibzwound through air9gp1 mhvyb ,7pjz7+gxa4wzoyi+u : )m 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 ajkpz r- ot cdx*6;mf6idx r-e8vrd3f -26l,ho 400 Hz sound, the wavelength of a 200 Hz sound in ap to fd ;xlicxrz hef2 kdr*-6-m83,vjdo6-6r ir 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 arm6l x9ivrrj /4 lrvg-a.iu)y k78o)fwe 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 +cpos;va j5 .5gp) lni7-orkzHz 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. e1df*nyh3 n f4 If you move to a point twice as far away from the source, the frequen4 1ff3y*en hdncy 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, intensitt6kq/k 4 fez/06ston5i pji7t y 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 distance d from the source i im/adl81l kb m2cras(n+oy09s I. What is the in9+2a kb8myi0 l1sr(a clodn m/tensity 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 equalos,gqt) kbk62as/:+l s;kg 1txwaq6 u ly in all directions. What happens to;k+ sgq o tgq :ka21b6)kl6xsw/au,st 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 uz461hbjh wuns9p /bbu6mrq 3 +qlj51 sound source that is radiating equally in all directions. What happens to the intensity level of theb+q3/ul9r 6bjm u5hw 4q61pzb1nshju 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 becomg:u,e5si o2no- ixw4e es 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 characrbh e9tiaj-owp0 l25 8teristic of the 9 0t ow5ei2pjr8ahl- bsound 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 no 6hx46obpf6 sn ganrm3u9- cq9te?

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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" (ly8csleqtpuqs.cj./z f, 2: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 into58y(nq zul ms,m-dp9 g 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 w j/(+.ab(cvbslnka0 d aves 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 t+ 6z-aii tfzl 9hha73vhe sound wave generated by the guitar as a result of this vibration.h+a- 3h7 lztai6fviz9 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 e h/w,3 nq:(mqg-rl jcq4:mk owhich 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 th aomozez-mqi 9(2z ./pe wavelengths of the three lowest tones produced by thi ze/. pi(mz2qmzo9oa-s 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 v6kq. iricup f71m 4f:200 Hz. Which one of the following frequencies will not resonate in the same pip kfivui.pq174 mcf :6re?

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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. zh f1m50,ssln,i2 pvb Which statement is correc1n,2,5spv f h bzls0mit?

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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 op * dh,)jao:k 0qhu- hbpc6r6reen 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 wavele ld,qwg7r 1c-mxw; bm4)1mqhgngths of the three lowest tones produced byw4hd mqw mcr)1gq, xlg7m1;-b 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 clcrlw-y2a7mv+u irsp (1/xpm3 osed pipe of length L is 200 Hz. Which of the following frequenc(p/wx-1m 3 mir7ryps+vu 2alcies 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 resonating at its fund)oyt3:kj6l rh fk:b4w amental frequency. Which stateme)l hw:f t6 krbo4y:j3knt 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 3 hy. baoub c0k)kess*0*w a*tspeaker produces a tone wc0**asuk ).3ahbt kb0* wyseoith 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, the two sound wl xt86 u7*rof)r jo v;pbtf5f4aves 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 b+5 lsqoz.; ;-du08 ytax rc*jt hw4tj4brm+oi eat frequency is heard. What happens to the beat frequency u0+wymtsj 4x;abo5tc.zjtqr*hid ;o rl+-8 4 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 explai gmfz2t ;64tzz( z.honns

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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 frequenc2 xu bg9pl 6/b/z yl. iotpd)9pz+h3pfy heard by the obserf h.+u p6)9/pppbzil29zto/b3gl xdyver 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 fr o5gj*csx9 uz)equency heard by the observer isxu o9z* 5gcj)s

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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, itc .pb+g5)lr t7pce3 jvs half-angle will decrease by a factor p c3).+l bvepcg75 jtrof:

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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 * /9v xf* -xlofhopsv-0np(ex is 352 m/s. What is t0lppfn*v-/(-9v oxeo xf *x hshe 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 1oodrc1y2 p5y 1e;kxged 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 xsr59wmq6349nau fxtsound in air is 340 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 sound? t3qf nsxw59 6mau9xr4

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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 temfbou fg6*rid1,e *n 8zperature 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 td5q7i9m uegf2 o the ligh5mef7 ig ud9q2tning 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;/9/w6pabss9r p t7t 7lnls kg 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 splas(y.i(ms0 k k:wv-bvekh 2.5 s later. How deep is the well? (Ignore air resistance, an(kvmiw. bsye:0-vk (k d 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 shc2f64uzpq h 9ound wave 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 air at +z fr mkfj4,zurn4p 96$23 \; ^{\circ}C$ 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 olw+ 8pad +zgr6f 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 gxy q6/rvcjk36 yc,v8sound?

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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 is m qb5si*m3z 6no4cs)ntensities of two sounds with intensity levels of 70 dB and 40 dqmzc b3*sos6 4nm5i)sB?

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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 y(dhs,t; rokaa 3+r2 kthe intensity level generated by one engitrar(k d2s3kha +,;o yne?

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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 th1ek(eu+4db*x qv;jh . bjlnh)at is radiating equally in kj q.xdb)v4 e*h l1;u(nejh+b all directions 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 14pp uql o9dy5a source that is radiating equally in all1 5dloup9qyp 4 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 power, which is assumed to be unifo6 s9a.ao 9(v5mukhgdqrmly distributed in all directions. What is thed9v.hq(kg a sau9 65mo 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 as8kpt, ko0q mbm/2a k1z :i+mh distance 5.00 m from a barking dog. What would beoq hz+a m1bkkm0s8p/t :ik m,2 the intensity level if two 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 sound source tw/i-/gi5cd-wnvx- s(nj (nz n he intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assum 5ii(wnn cg /n-x(wndjs/v--ze 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 source( )cje ..kqvpn is 95 dB. At what distance will it be 75 d pv qn)..e(cjkB?

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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 o.jk61bl:l 5j uca4vkis the frequency of the fourth harmonb:cj4uo61alk. j lkv5ic?

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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 5t;m wo99dkm ran open pipe is 900 Hz. What is the leng kod95mrw;m9 tth of 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 open pipe of length L is 400 Hz. W d 31k(ks-2pcq5 zwkdk ;ra/nzhat is the frequency of the lowest tone that will resonate2addp3rwqkkzc1n;/ (zk 5 -sk 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 length of 0.80 m. 3hl zd6fd::ek*i k 4sqfei 0t- If the velocity of sound in air is 340 m/s, what is the frequency oezdt q340-i :h*kfki:sd6 l fef 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 the temperat4veyq *j83q k7e/jj:/po ngrqure 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 frequenqk6axm*t 01od+ 5rf ekujz6(:otu zdqc6 d,7wcy in a pipe closed at one end is 330 Hz. What is the frequency of the third harmonick:doo 6xdtq 7ew*5r+,uj6d (q0a ct1kzzf 6 mu?

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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 off0jt e *v:rk)z the shortest pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of soutz)vj*fe r k:0nd 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 the tefbq1 ;jo q/sj3o 7ess9v,.akkmperature 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 temperaturu8 8wu;y4odeq e 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 ai we ze,-5cvr,vuc:iz8r is 34 cv5w- rue,zc:8 i,vze0 m/s. 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 other8snpx 55a-j6xu (epdptr3j5k ,e7zse is closed on one end. If thepn, repp-e5t 5 kjj dsxx 8es653auz7( 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 frequenc2.o6e i-bx(7hwo cizn. l wri4y 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 soundwiwnli ho.2z -be7 oc64ir( .x?

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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 /qunxsk380wkm3 up-a 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 fo3 nu s-kmaku/30px8wqllowing 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 ofkk3 ,jurit .3l 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 6ob0 : vzd3 5ajokvjkm 4/mnz5tune the frequency of a musical instrument. If the tuner hears a beat frequency ozjkvbozmk 4/5o n6v5 j0 d:3maf 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 prod6*7msx4ap ro6 fvuu)q.8t h kduced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a dayf o.t*qxs6ru84p6a u7dk v)mh 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 stringsg,, :-uwjsd8v* v +hdxam qzr0 on two violins in an orchestra are found to produce a +asmg-hxdwj,8qvd,:0 u rzv *beat frequency of 2 Hz when a 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 statiod3 e )n5caxvs6nary 1000-Hz sound source at twice the speed of sound. The observer heax5n6cas 3 )vders 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 100e sen/ zu+)y 0cvv)c2k0 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a frequenc)2ns c+ve yucvek0)/z y 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 d;ijqh 9)3igw lj u0a3cyc)r 3moves with a speed of 30 m/s away from the source, what is the ra0 y wgcj9)) ch ;l3udjiq33ifrequency 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 atem: r, 1(l-py lbzv/rf 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.e-lz plfb ym/,rvr:(1 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 train approaches wit625 7 2szy8;r0 sus,xsgqe2shms dlhc h a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound is 340 m/ sy7cul5 2s2sz es2x68h g,rmq0hs;sd 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. Tht u /m; u8xh:mhn8t;mxo j+ ldaon)q95e train blows its 400-Hz whistle. Take the speed of sou nutln: t;hq8mo dh;+)a58/xj9oumxmnd 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 itsxc)0 zk,pfwcgx+xv3y: wg5q+ 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hfcx x+,5qz: )wky0gw3 xcv+gp ear?

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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 40,l2d4ip6*c6bq brgbn 0-Hz whistle. Take the b2cr g *qpdb,46lbn6i 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 blows itsq2**8 u ju crvne. o*wp)ph0*fehn x,q whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency of the *uhec opwxr**eqn)n,j h u20f*8p.vqwhistle?

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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 i,zg)cojb6nql (b .ydx+on 6/rs 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observebo+ o/bd 6g).c,y( xjn z6nrlqr 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 th02p4 m3a3vual5tn ndn e speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer int5dpa34n 3 mu2n 0lavs 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 oe.)xnel8zxx:/ n9l vsent out, and a 42-kHz sign/o:8.ez9xlx xe vnl )nal 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 shockkkk*gb /+,6rs4 fwudo wave 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 Mach 1.4. What is th; bk7+go)+ pfq7jbw wiqo.1mlzg 7ep/ e half-angle of the conical shock wave fl7zq;j p7+ 7g.w/bo) +ifbwpoqm1ke gormed?

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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 wiy7iqzm zo6kw69h/ k +jth a Mach number of 1.05 where the a 9wy7zh+kqoki66m /zjir temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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