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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 a false state(+ks0x ajtj2- kat1vnment?

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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 7rz4 qrnn8pp )conducted 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 sounds74 txsfv.3 p;cps .ou 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 ins-fbtqcot i-oyn49itiv /(x .6 (az h0creases, what happens to the velocity of sound? (Assume that 6oot tt (4a0bn i/y9iq.x-cv(ihsz-fall 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 ofp (dwwvi/c2fao x:* ;s+fusy* a 400 Hz sound, the velocity of a 200 Hz sound through a(s* :vuap; cwi*o+2 sydffx/wir 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 2001eq+boi9 9hg y Hz sound in a g+ie1byo 99hqir 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 are hab: c;p++bh4vyh8gmizm:i b1,x s8 c 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 Hz are 25ga*q.rb ex: t0k kcpcalled

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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 et uc*lipwi*h 1;ot+,vve *o 1directions. If you move to a point twice ti1v +1*ce v*loui;w *tho pe,as 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 ww:l.hvk7*sszz2r yh ;x;eb /yaves, 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 atpzttw bqdk .9,,6wa 7q a distance d from the source is I. What is the intensity at a distance 2d from the sou6 t7dq .9,bzwktawqp,rce?

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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 tld*7pv9lu .yequally in all directions. What happens to the intensity of the sound? I 7lltpvyd9* .ut 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 bq)awri8-dx 8in all directions. What happens to the intensity levewadq-br 8 i)8xl 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 s8:buz awq5/(mr5tep + ;pnaras 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. o ,rqdk*geyr)vf. 8/3u0lbox What characteristic of the sou *yvr3od obk,)efg8lr./uxq 0nd increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudniv(yf9.4ekq mess" of 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 "pitch" of a mc; joxw-+ ikb:f.c3 two1pyj8usical 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 into wa+z*d7 j1gf+cixq s8vn ter

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displaco3h+b dwncj29qu dtp5rof 6u t);td.,ement 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 a47md zg 0q fttg31u5adnd the sound wave generated by the guitar as a result of this vibratiod gf37guazt4q 1md5t 0n. 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 whiy5xr6et. ytfr g948 v be8a(fmch 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 wavelengstu1e :is0qr.2v2hox ths of the three lowest tones produced by this pipeo:ti1x.es2s h 0v2qur ?

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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. Whilu ) 37xxk,*wiiu( z/mzk( cocch one of the following frequencies will not resonate in the same zxcuizl( k7 */ kcxim)( ,u3wopipe?

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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 zzgg8;68 wkf2er g1tl3f ey m5frequency. Which statement is corref grmgz58k68 2 31leywtz;feg ct?

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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 bu3ryr5ev6 :ki1 yr2 kone 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 o:; ;e4trrmy7q;eg o rjvk 6aw4f the three lowest tones produced by this t:ay4 wjqg;omervk6r74 r e; ;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 clo 3,g6bzwe4 lg+;zgd qused pipe of length L is 200 Hz. Which of the following frequenciesl+g,6g; 43dbuwqezz g 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 f(z c2i+khp:n resonating at its fundamental frequency. Which statement is corre2 + hfck:zpni(ct?

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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 /kf a(y- u kvqlg*ur:/speakers driven 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. Thek/q:r( g avl-fu* /yuk 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 kifkk6k+gbk4i a+p;qc bj-6. 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 au z x3ks,ib9nfu65qp;nd a particular beat frequency is heard. What happens to the beat frequency if the frequency of one5s9 bqpki;3 fu,6znu x 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 expa4hxc). g 0:omsfuxj /lains

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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 ob41e3d4uf7u vk+ao rq 7)xxc ibse)41fe4id bku7q crxa v 37x+uorver 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; 4 6k2ufgr.vs1we3 oztwn9- pidw +lg heard by the obseok3lrzs vw+96 e t-ui12w gwd .pn;g4frver 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 douykvszh.8050d b:h wuuble its MACH-speed, its half-angle will decrease by a factwdy8 bsh05.: uzvhku 0or of:

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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 is 352 m/s. What*9sdu g*b85 xvqb z huq. fceqz*pn)66 is the air temperature?vz*s6nef6hd 5*zq gqq 8.*9 buucxbp)

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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 sou nz xlu:ia, 1gd.m1m(bk+ 8phpnd 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 340 m/s, a bat emits a shriek whossiv2: +xf uul3e echo reaches it 0.02+uflvi :x23us 50 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 echok +:k 0bfvjp7vm;7 ybp a3mgi5 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 afterhuz 50 :w.5ermnn1 kve seeing a flash of lightning, the distance to the lightning strike z1:uwmr0 eh 5n5nv.ekis 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 tempzo6no dt. x:0kerature 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)3*saxr/gq l i deep is the well? (Ignore air resistance,qg*a )sr/3l ix 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 frequeng lxj,/d6)xhz cy 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 ajrn 5b)+a: repfj+tg5ir 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 ;.*0mzlg g-2u on6id :+n3lqyapj vzi 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-d ree,ud9qre-59vu2c h8lv 3t fiiv++kB 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 s/:tpx w .igeq;ounds with intensity levels of 70 dB and 40 dB?egwi; qp:xt/.

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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. Wg2bgvh:;67m gn a-x;kgnk+h5eu i et8hat is the intensity level ga tge2ke-i+g: m6;hn5bu7v8 ;xhgn kgenerated 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 distance of 6.0 m from a sourc4 ;hjzlj6gck46g37 w77(y uampbdkrz7 s ls.ke that is radiating equally in all d w u.h6k7a7kg(js7s6rcjzy l3ld47kb g; mzp4irections 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 frfzyd ieu )b zugx (9-+,e5meez) i35weom a source that is radiating equally in a))fzz5um (i +deg9iz, eey uxbwe5e- 3ll 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 uni o 9nyd8g sz9,l vxj;20vtdwz1formly distributed in9ovt z1d xwv g,8yz 0jls2nd;9 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 distance 5.00 m from a barking ch/qtx8pt awj14 5o6v dog. What would be the intensity level if two identical dogs very close to each other are bj1q top6a wtc 5x48h/varking?

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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 t6dl dy pl;65/t8homu te87ghxu)a7g 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 in alh78 6dh5y tgupt;a u7 x) ltg68/eomdll 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 is 95 dB. 2hech;lwpbgca19yzeo 27 + -n /g6yinpdev,8At what distance ,czh+h egg6yb/2 2p 7ya8- pv; 9dnecwon1leiwill 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 has a frequency of 1200 Hz. Whatdo2)w;vfuww58r ib4 ,c.t) :m cleuct is the frequen,um4b)fwiwoe5d c2lctt;:wvr ) u . 8ccy of 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 opwk,m-*w uh2pcv: v ;euen pipe is 900 Hz. What is the length of the pim:,w-uv;2c w p *hkuvepe?

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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 lengm)6jhmwa: 1 n y8yw:vzth L is 400 Hz. What is the frequency of the lowest tone that will ren ):wyjay1 mh:m6zw8vsonate 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. If the velocity ozgmg5wdo5 :pk :: jcs)f sound in air is 340 m/:m5 zj5wkgos dpg)c::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 wa-)mhkom) yw2w3j n 4vhere the 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 closed at 9 kx rr,w vj)b7p*xk)rone end is 330 Hz. What is the frequency ofrxpk ,9 x7wjkv )br*r) 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 one end that 3ylnhfyb)t; )r z1z:bwill have a fundamental frequency of 60 Hz on a day when the velocity of sound is 340 bznfrh)y;3b y:z 1tl)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 temperature is ;0k jjzkqx;;-g) v r0+vzsi hj q7kru*$20 \; ^{\circ}C$. 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 the0 9nyptn+w2e a 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 laboqz- rleo jg+, 2q;907e.lmyi4dp is played when the speed of sound in air is 340 m/s. .7g94j+oa; ldlroe,0yq2 m-bz plqieWhat 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 closed on 5bvr1p5rzbj+ a(6q x aone end. If the fundamental frequency of the open pipe is 30raj +z65qbx p arv51(b0 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 frequebai(vcjwea o 75p w321ncy of 800 Hz in air where the velocity of sound is 340 m/s. How much fao 2j31v pwbe5w 7ai(carther 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 placeitsa4( zr* g49kf3v:lpz(t cvd side by side and driven by the 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 sou9tvfz cavltr (s ipz4g:*3k4( nd, 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 an vpf25-ljy p5ya4+r3wg ; ofk y+ufi2fd 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 musi( 1 jt6w2s27ychx ffjrcal instrument. If the tuner hears a beat fxy h 1f7 rsj2c2j6twf(requency 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 twenzgo2/l*f 1p(lk qd2 o horns are 6 m and 7 m respectively. What beat frequz/1fkl (onq 2*glp2edency is 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 two violinm/s4er h+mr je of1o00s in an orchestra are found to produce a 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 samf0so014 + oemr er/hmje 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 pm(b .q0; jz:rjdkd lq:g)xv1sound source at twice the speed of sound. The observer hb:vkdmjq(g r; q:.p)0djl zx1ears 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 vfthmw(o no-5pn9g9 n( /m9l zHz) approaches a stationary observer at one-half the speed of sound.9-/ vl95wpmz9tn ono fh((g mn 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 frequency of 10003u vi) bm1-2vedk,)jdu+jolp 2hkoi, Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard 2 ok-)3 dlpoejj+idu,2b)vm,ku vh 1iby 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 travegah9u( dg v6x+ling at 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. What change of frequency does the ob6 xuv +ghd(9agserver 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 approachel2oo q ybvzqn-5):q 5us with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound isqyb q5 zlo: 2uv-q)on5 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 :1in:c,dc (g78n ,kbaxi:vjyh4+vcd l zlak 0you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 ,b ( x a7+zva v1l::48lndg, j0ckchd ki:cyinm/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*)3l(e5lb kaojhr*dm br6vs8 3b whx9 stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequh*ljl3eo dwbmbkrx 83 h ) 65(*9sbrvaency 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 awa wqvuf/c0*np 1d6fkt -y from you at 120 km/h. The train blows its 400-Hz whistlu f 0*6fv1wk-n/cqtdpe. 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 blows it8ifoib ,pz5/33uw(j foxcwx4s whistle, and you hear a tone of 400 Hz. Take the speed zxi8obp4u,3ojww5 i cfx f(/3of 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 spp u6o drg2w5ee)mfh(*eed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer i *o56fe) hp(d2ruemwg s 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 sound in enida-(gj/7)sdi q3sair is 340 m/s. What is the f/(-e) idjqds 7asg3nirequency 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 40-0yubofoo ws2q n61t-*kHz signal is sent out, and a 42-kHz signal is returned. Ass0s1o-n qu y*wooft6 b2ume 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 wa ,4sr3ykb1jipm5g6 x ,eytw d(ve 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 the half-angle of the conical ;o*x 1gpoz63 ro):kw,yzgnet shock wa gon3 1,wo6zxyr pk:g)e z;t*ove 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 Macfw4;rlp y0: vlh number of 1.0:wfpr0l4y; l v5 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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