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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 ( e0 diij9epm7statement?

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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 conductedi -g5 zc.): +e*y ooj ythwu90zuzin9x 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 sound inlk-(hnabf*u9w n gpnik (9 g33 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, what happens to the velocity of sounzn p+.kah3xjuth9w 4 1d? (Assume that all other factors rh .x4tap 1unjz3 9k+whemain 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 ar6. khew,u0ju. e o*ra+ d:nos 200 Hz sound through air i.u ujoa. d6r hee nskro+0:w*,s

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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,cc v48*1pwcxwifi(u/2;lsx6z ;h upk the wavelength of a 200 Hz sound iwf iuh;;2zkl uw648sp(vc*/ic p cxx1n 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 greater than 20,000 Hz are caqxu ilb m+h3y vkz2xw11zhjxg/(+6u4 lled

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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 p8o- uv* g3wqblljv)7/ofk)nthan 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 wawds1;hrd g4 ,mves uniformly in all directions. If you dm4w1d;, srhg move to a point twice 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 divergioxio-y*e, i .jnhidb6/ p7xzh4(*sqlng waves, 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 distance d from the source is I. Wha.vnvlli*p 2z(t is the intensity at a distance 2d fizl v .vn*2p(lrom 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 raz tg/-l6) ujx(pwi/bkdiating equally in all directions. What happens to the intensity of the sound? It reduces t6x/w bp g-jti) klzu/(o

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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 ewh5 /d:ad)rcv fd7hgsid (m:9qually in all direcdim)hf5d ws 9dd/hv:7:acr( gtions. What happens to 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 becomes loude 4z(m2-bg nwigr?

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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 /yclnw:h ,sj qhz b4u64u 0ja(speaker emitting a pure tone. What characteristic of the sw,4zy4 h (0sunj6bjqu c/hl:aound 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" ofnc )q9/ /q+ko lkv4wbm 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 mu9:tt* ;oj6 fi vu6le3:gmt iswsical 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 fro zgkk 5-wi:z dz7ad. )b,aw +pgfo6fn9m 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 displacemen n ca :piizbt6rk15l r))(t:pbilc3;*-fbjtot 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 m,7/ 3bbdenq dsound wave generated by the guitar as a result of this vibration. What do these two waves have in commob qb,n/e 3mdd7n?

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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, therq *qih qj4:q5k dl3y3oe

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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 lengtheea a+dmr0 mvl 6;hd.( L. What are the wavelengths of the three lowest tonesaa6vrh +e0m .;me(dld 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 pipex1zelu4s8,fya+c, jl of length L is 200 Hz. Which one of the following frequene4yl +j18cl,, xzf uascies 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 freqoku+4zt z9xi v:+ k;fcuency. Which stateme cxzki 94o;v+f:+ktz unt 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 i-kll tk ai)e 0:+alna/s open 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 at poycg/sj*v:g8(z ai7:s 5l three lowest tones 5l8ga7spt:jizcv /:a * ogys( 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 r9hiayf8 8st,q6 f3tp7gkvl b(esonate in a closed pipe of length L is 200 Hz. Which of the following frequencies will not reso tg8 t6sp8fi yvlq,fba9(hk73nate 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 resonatingn om 69hamyi1. at its fundamental frequency. Which sta9oa imn.hm1 y6tement 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. Eachcrd x qc/ 5 4jdenh(:0pv3hox3 speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/q5d0( rv onep/jx d:xhh433cc 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 sor pnwd +xc7ox/w,0+ca6/ ugsm 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 part vbwf:9t* yi 8,7tpgpp bi+x:sicular beat frequency is heard. What happens to the beat frequency if t+iyf ,b98p*spp:b tgvt7w :ixhe 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 explai3xffr3 6 6vxcins

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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 frtur;q7 9jd9 c.8f: pwgsenm3n equency heard by the observe8umjn9 p 7 s9tc .grew:q;fnd3r 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. Tht4owx84 aivj d5mm4u7hcp:c+ e frequency heard by the oiw 5pxa 4:jo u+4mdtcch874mvbserver 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 double its MACH-speed, its half-anglei9g*l vxz 2x-u will decrease by a factz- 9*uvx xg2ilor 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 frequea.hwj( *sovs fu9s rdf::re -4fc;5rh ncy 45 kHz in air is 352 m/s. What is the air temperatu4a rv;ew.5fd-h(r: ojfcu s9 s:r*shf re?

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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 oam;y9m (u +iujf 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 in air is 340 m/s, a bat emits a shr2i 3 ) hwidrf,)bjj+mjiek whose echo reaches it 0.0250 s lm2,j w+jif)di b3hjr)ater. 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 temperz /zqf7*5 szttb11(hp4e ibz fature 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 see,gwx(.1jx31 jc pdgy1ra x*:5tu v/z7k obs pling a flash of lightning, the distance to the lightning stgx1 j 1 y* v 35:ua/cd(,wzlkpx 1sgxpjt7bor.rike 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 clza,7y6 ( qa4+k8m 5uv62fxg yol ditzaiff 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 2.5 s later. Howk ho2*4gca n9nkdf7 0u deep is the well? (Ignore air resistance, and asgfnn u2k7od ah k*4c09sume 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 frequency rvs l9:os)co:ko9rwf q7zu )rw7e7v5500 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 hpd4 tx4u:ki8 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 auf4q,hnpprn7: a w5p9 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-dBi3,h+3g5bp9dg zw1 j mg8c igm 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 levels of 70 +bo*v u, (gnctdBt,gob cun +v(* and 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 in a garage i08 mwki330mn7 jdjps-b,yl ips 100 dB. What is the intensity level generated m 0-3kj0m n si8ij py7wpl3bd,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 source that is radiating equally dju0.ine e(.d nh38cf in all directin.ei. (e 8jfnc0hd3ud ons 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 source s6 dnfah(o:552mka,byh c kw+that is radiating equally in all directions (kk :6cf+5o wmha5an2,s hdbyis
$6.0 \times 10^{-10} \; W/m^{2}$. 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 assu+z,8di 7*ttcx:;deicoiea . umed to be uniformly distributed in all directions. What is the int;8cd*aiuzt o:xc .ei e t+,7diensity 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 ac3xzh aax;5-tscuve,:1f 2 j m barking dog. What would be the inten fz; camct 5,eujh:avs 3-x1x2sity 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 rfvmiu kt) grgrwhw-gu,*4 0sl06 /g9m 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 radig/lw06kv f whgguu0r )4rrg- *i9tsm,ates 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 is+hvu(jftcjc0 kkq0 7rl b-ah:(o*9yi 95 dB. At what distance will it be+j-0lyjf v(:khha9obi0* q (kc rtcu7 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 is theo qqzr/3e/:zp frequency of the four:z /oez /r3qqpth 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-zrp ;l uud.5t harmonic of an open pipe is 900 Hz. What is the length of the pipeldptu-rzu; .5 ?

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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. What is the ebclxif0lr0pf (-e45bp d ;v6 frequency of the lowest tone that will resonateb-plr;5fv06cbf p (0d4xe ile 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 e /mpw 7m0cu3ghev(u +snds has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the sec 7/0 uuvwmp(3+m sgcehond 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 t8vo el uqzp+j) 7,wg4hhy/by* he 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 frequencyn 1 j bw9fkz/-)xfaunc)il7ebv+j2 p7 in a pipe closed at one end is 330 Hz. What is the frequency of the third17 l7 z2/n 9nbx+)c- bejf fivwpja)uk 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 thatn *h3xy9:75rbt.ft ah 8ud s hnyuhjd9+(ks w; will have a fundamental frequency of 60 Hz on a day when the velocity da7 9yr* +uxjtb nthn(:s8 swh3y.d; f9khu5h 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 where the temperaug8qw nspi 5.c,,) bdfture 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 we obzbc5, o 8t29 (8t.4c2rpviyvneznhere 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 is played when th waqb*i3jb 9j0y2v4xl e speed of sound in air is 340 m/s. What is thei3w 0v*q 4b9jja xybl2 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 isyn 6e+fpznh(5vgf): / zl hoh2 open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, whatz2p6 eo5(:f hlzv/y )hhf+ ngn 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 frequewgz/ma 0olv7 0x1 q+gqncy 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 so w+/q7 mv ggqaox0zl01urces 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 / dzy7jw -de (:2netbj ph41ukside and driven by the same frequency of 500 Hz. I 7nj(/yd4 detpbe2u: jkz-hw1f 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? (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 beat f:-qm -sw0tkx krequency?

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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 tu id0p0) g,0ew*:vojg2 igedytne the frequency of a musical instrug*t2dew 0j,d0ggy: ei iop0)vment. If the tuner hears a beat frequency 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 pr7h6b ;m+ evuvzoduced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded vhbu mv7ze+; 6on 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 violins in an orchestra are p/4,8w yqa og8gf;z.e fw w+qpfound to produce a bea/g8ww g e,aq+q fz.opp4f;yw8t 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 stationar;gn v ,rvxx; mj:t(pj p4 h*(w4tc;zjby 1000-Hz sound source at twice the speed of soun (,:wp;gt rb(x; mjvv*4z4;tnxj chjpd. The 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 frequ m bvt4,j-f,1gkxk +icency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. Tg b 4vtjf,ik1ck+ m,x-he 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 1000 Hz. If a listener moves with u/fg 45neamz, /qj0gmcb u s77a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speu mc0g jgfsa/ /eum,q7nbz475ed 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 peax8wl0d wo 7 be9+j3-ltiu+siren. It is traveling at 35 m/s on a day when the speed of 9p3ibl oa0t +ww8e-l uex7j+dsound 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 st5cf+e1ixkn+4s xbiu /ationary observer when a train approaches with a speed of 30 m/s. Then xk5x1siebi+f uc4+/ 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 towarb)3w;ixbc yi4er i.4 rd you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of. 4crb)iiy4r3w;bie x sound 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 trai:macfd+ g/e6bn blows its 400-Hz whistle. Take the speed of sound to be 340 m/s.fead:+6c/ m bg 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 traint b9nh)f1iw; papg 5/e blows its 400-Hz whistle. Take thewg p91ane b5;/hti pf) 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 its whistle, c8v03 s7,edo6vh sxtw and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is to3vsv w h7,068sxc dtehe 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 in air is 34t1f ga:(ll ).; fi)yjbf,d 7nc*wjpbr0 m/s. What is the frequency heard by an observer if the observer is movipi)w l ar(*f1y)ft nb7;d jlgj,c.f:bng 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 soun2xn 64i s re4x-zqxk9nd in air is 340 m/s. What is the frequency heard by ann4x6re9qx-kxn4si z2 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 ololo4 5gu 02lwf an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the0ouo42g w5l ll 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 by a supersonic aire 2j+ff9me,nhpkx/a 4 craft 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 i (j;r*mk o)zchs the half-angle of the conical shock wave forz m koh(*;cj)rmed?

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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 Eug5 gb)ifpp-j l0p 5o6irope with a Mach number of 1.05 where)oilf 6pj 0 gpbpgi5-5 the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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