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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 followi4l.ahx- yd *op mb*ra1ng is 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 fastest thzn+/ 3qojmba -/, slzorough

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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 ro2l6sdt/ou 1 og rly4yakfv00.d?

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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 dsxvy0sv) nuv( kh1pq: -2m9jincreases, what happens to the velocity of sound? (Assume that all other f h2vumsdk jvn-v:p) y qx(019sactors 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 sound rex,+ w/ :gida)7 )vilpro:nithrough airl):riov ,xaepidi)+gnr:/7 w 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 wavelenvr,8zbyg : q1i;ccd2ngth of a 200 Hz sound in aqcrg:b;i2nczd ,8vy1ir is

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations wit (zcj.hx9;suo1xy:hc h frequencies greater 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 6s ;d7pgnson-4dj*lifrequency less 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 source is emitting waves uniformly in alla2kn,h63wq vs,hj.xlwyxk ;3 directions. If you move to a point twice as far away from ; l w,6 v.x 3qyanhwsk3h2kj,xthe 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, wfq 6:tcx; :l:x0 s xzgp.5vstintensity 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 poin emvtj+)nd8-a t source at a distance d from the source is I. What is the intensity at a distance -e+dj v an8mt)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,yfj ; -numgrmbq2v ;8 is radiating equally in all directions. What happej;v-2,mnm buf;gqyr8ns 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 qnaecx,9 bwbpe o;/)m5i,q jp:to17 sa sound source that is radiating equally in all directions. What happens to b w;c oa tjpo,)qpe9bn:xi5qms,71e/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 increases as a sound 7rrkxp6sssk2j+*bvaw 1pc:u;ku0o 8 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 characteristic of m0gfbli 5 yx9api3*,fthe sound xifi*90 gmb f,l53yapincreases?

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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 nu 85f i bi,y 6lna,(huocn y)m83r6dquote?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the "piczubzm.nh 617zul 54btch" 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 froy6zd)8vyx ypxh9,.pk *f ef8sm 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 displach2ckrag45 2lk hxg v ,;03sadpf9k/hwement 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 guitl86+d tqqn 8e ,t8uzxk/xd y(ear string and the sound wave generated by the guitar as a result of this vibration. What do these two waves have in comd8q/y8xt,6 tq(u x+ekle zn8d mon?

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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 istf-rooe o4t 72 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 wavelengths of the tsi u. ,bi9xay-v: ,fe*6dohrehree lowest tone-b:hf,9e ou xdvs,ae.*6 riyis 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 pip h:cx2za83gk0x dfpw.e of length L is 200 Hz. Which one of the following 2k. xcpf:hw 0 axgzd83frequencies 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. Which statal*9d- m)esr vement is corrv)*-9adelr sm ect?

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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 dh:i1zbha z2 .7qr lta3u6dtl*;1mhg 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 thq 9 lro 7vqz38xaja(mwy 49c8ce three lowesqqmrx(wo3a8 alcy49 z8 79jvct 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 is 20( utfsu--w9kwic 5n g.0 Hz. Which of the following frequencies will not re icnstwk5(g . -9uw-fusonate 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 i6gc1,r9h amc8u 5jt( jzgyo,n (.ak twts fundamental frequency. Which state9g6jgatmj 1h ckun(tyz ow8a5r.c, ,(ment 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. Eac;x1+ j,z n488g 3 frtm,8j)sxnyyg-epdarccr h speaker produces a tone with a frequency of c8s8,yf;8g)n3myrjrzrge4pa,+t x 1jx cn -d200 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 waves shouldz-qtk mw3)6su0iaqs31 f/t xh 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 isb/vq h2jvvu lg++uk)8r b.on ( heard. What happens to the beat frequency if the frequlh8k+(rv/vgo )u.qb+ j2vnb uency 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 explainm zpcm ,f i3(4x6vbp6as

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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 frequency heard by the obsz9v8qa da)*mx o8tp m:a:ly-yerver i8qa y:tmx) o-la9v8ym d *zap:s

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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 ft 9a zy:al y,varg wwns 3evrx):e./dk.))6a lrom a stationary observer. The frequency heard by the observer is) 96synr) :xaa ,.:kr3e/ yt v.gvae)zwl wdla

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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-angluj3e j i8s)h+je will decrease by a factor ofeh3 ijj)jsu+8 :

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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 f8 obr8m.,pik kHz in air is 352 m/s. What is thropkim8.fb 8 ,e 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 speed of sou0jyzo 7p2,ewb nd 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 is71tzlm ra-y4-)7kpm n5 z/r hns8inrg 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the obj/zgy p-mrnhnti r5 r7 48s 1an7-l)zmkect 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. feh6k2 tq*lov q- ;2vnThe 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 5evppmdo47 c+ gcm2l n,u6b.,x.0 s after seeing a flash of lightning, the distance to the lightning strike ,pgp72u c+b xlc4e vmm.,n6do 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.vpf 9mfl/c dx2:u cd9 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 2.5 s later. How -o -.cf ebp m)2akp2lddeep is the well? (Ignore air resistance, and assume the velocity of smopb dlf.-2ep) k-2c aound 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 9 8rcgtwt9yy7usu21t 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 att c-lg .v2 *lt 1fz,5mp)z6nxvoxmki4 $23 \; ^{\circ}C$ 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 intensjmb e8papi)b ,jp+2 co :4q/nhity $10^{-3} \; W/m^{2}$?

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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 7e9buvs:1/uce 44sdtw*eo9ze* * fpit 0-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 twa3wajr, yd- 9vo sounds with intensity levels of 70 dB vjad 3,r -9wyaand 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 9; bxleba*cb9in a garage is 100 dB. What is the intensity level generated by one engine?b9bb*x9;e lca

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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)uqo56:62rpmu3oh pjs mq )r)bg7a cb m from a source that is radiating equally in all directions ir)p 7ua scr p6uqjm b6o:2h )g3)q5bmos
$6.0 \times 10^{-10} \; W/m^{2}$. 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 sourceds bwe75u3azrtv26 v mqv+:i: that is radiating equally in all 3mw6uzb i5+2 v:veva:7r qs tddirections 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 :j vmr67 zwik04djl+ ebe uniformly distributed in alldm :0jiw746ez jvrkl + 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 distance 5.00 m from a barkin;yh2)jn xjzxtg6iy36 g dog. What would be the intensity level if two identical dogs very close to each other are ba636jg )inj2zxtyy xh ;rking?

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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 4s lew0:*qo8+hxhribc a2 to:c6nu*im from a sound source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equally inlrwqu8xoe ac:con 2 t*i0bs46hi:*+h 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 le v 5lex9;hb0uqvel 5.0 m from a point source is 95 dB. At what distance willl; v5ueq hbx90 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 h 9h(m0ff,i:t qwq;uo gas a frequency of 1200 Hz. What is the frequency of the fourth huf:q g mqtfhow( ,09;iarmonic?

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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 9m)3zrfjl z 1 p *7k-ta9se(eyz00 Hz. What is the length of the pip-*j l y)az91(ek73tszepf mrze?

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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 ov3ha a(ftt q .mo im*+,+m* n2zrd/pzzpen pipe of length L is 400 Hz. What is the frequency of the lowest tone that will reson *om3aa2hz/t mqm,i p(f ndz.r+v* +tzate 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 :h5tq g-8e.2xmby02ok5rywx icogu0 both ends has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second :-8 gk 0uom5hc05tgq2y2w xx o e.yrbiharmonic?

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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 tempev5v6 xy mkf*q6rature 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. Whs7 ;e6dfcz3 etinl2/(ht ewd0at is the fre7eel zned0 sw/c;tid6 2(t hf3quency 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 pfa fu +g pgau yxy9aj8d0704u9ipe closed on one end that will have a fundamental frequency of 604yu09fu0jaa d+fg98pg a yu7x Hz on a day when the 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 ag/p*rw8+jx4 k i-uo es room 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 temperatuk4h ;4 .yntupure 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 r z 1gp(sb p de6gbkize 9),+dkbbm(6f2:wj/qr is 340 m/s. What g6k6kr)1s(fd g bb(jb/qb we+d2p zezm9: ,ipis 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 cyqzk q9wqks3i1h87 lk. yp69qlosed on one end. If the fundamental frequency of the open pipe is 300 H kq87 q z9kyq6 k.1hqilyw9sp3z, 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-qtr; uv +2 /:ji+co daugvjd7 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 observevj+g+qt ;d2rc:o7ujv -a/id ur 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 freque au(w+/l os 2av2zxt(ss;p p7azhk)+jncy of 500 Hz. If the distance from a person to one spea(h2 v sazo;z+/pw+js7t2kusl )paxa( ker 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 beatfza1k xm*jlzoqj1ykk gb9,5+3 4mr5i 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 tl uxex4*o.zp ds;-ie49vukx+9 l o0uiune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the instrku v .9uux+ o*l-e9i4xo s4p0lxz;i edument?

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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 horn o5fmy5e 7.dkd sxi,8us are 6 m and 7 m respectively. What beat frequency is heard wheo fy s kei87ddxm,55.un 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 viol xuvqjm;*(hz(-qiwx w)qrd,0 in strings on two violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency z(0 hm) iqwdq,ux-v*xj rw; (qof 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 tznge +py p0k1b/ztj, 3he speed of sound. The observer hears a frequencp3etjg/ zk+by0p,z 1n y 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 statio3c m .5oytv;cqnary observer at one-half the spee c vym3o5tq.;cd of sound. The observer hears 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 frequenl+b8 71mzg ut 3vb+wnj6ra1uscy of 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequencywbs+g3uur 11+78mtnlj vabz 6 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 sy*r -no nav)tj0tt7+ gj;0 mwdiren. It is traveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and )0-twdgv; a0jmtr oj n 7yt+*npasses 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 statiunkw 4oqj)6im 3 y*0qnonary observer when a train approaches with a speed of 63w0ykqo4n *qnmu) ji 30 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. Thjiqmy ef( *+,ce train blows its 400-Hz whistle. Take the speed of sound to be 340f*i+ce(m ,j qy 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 400-H+p -1i-oqq ka nf:fgk202v+dvx vdki)z whistle. Take the speed of sound to be 340 m/s. Wha q+2+d d v-qvpknvfg 0ix)ak1f-o:2ki t 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 1ai; fep zdar esi4bxn-0/3m1400-Hz whistlz/baxda see1mr- 31ip 04 ;infe. Take 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 km/h. It blonv 14, f0,n47) vvmzxoleub gows its whistle, and you hev4nenv1bm u7,lzf,o4 vog) 0xar a 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 k:7cc69, lbpi etvk u-8- ajcvin air is 340 m/s. What isvk- p l:c acc9uiv7,t8-ekb6j the frequency heard 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 xxj y 897my)m.7ry2(hg zixzfis 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an obs9h72xx)gmy8 zrfyxj. zm 7 y(ierver 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 ob90d qdopui* t3ject. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m9 piu*t0o d3dq/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 l,//y swy 0qtcf31wqm0qpqe-4k1 gztproduced 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 the half-angle 0 kfux9;,y.r :m cixdzof the conical shock wave foru9d.mk0 x:x;f,c izyrmed?

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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 Mach numbe4m1l a ds xhfd7y/l):ar of 1.057 h 14:lday/dmflxsa) where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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