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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://autodiscover.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://autodiscover.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 statement; z32m3 rsr f-0vtldb6(dal76hlkp fi?

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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 zy4t 2xqm/gz 3b*e 9mjconducted 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 in a pp7wl:+ zy r yth,09vusteel 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 incr (na ax*c8hbv,eases, what happens to the velocity of sound? (Assume that all other factors remaic,xavhn(8b*a n 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 veloc+nir )j*+w;y9nztqfl 9-xqhu ity of a 200 Hz sound through air is-y9n)xhl*i+rzn t+f ;qju9wq

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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 wavt.zh1fkl+z; ielength of a 200 Hz sound ih. ft zl+;zi1kn 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 frequqeuy0y. 6; zj y8w6hscw,l0n oencies 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 frequency le3 -k/hey/qw*7mxw rkcss 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 sourcex3h8 jcc:t2te is emitting waves uniformly in all directions. If you move to a poit382 cx:ehcjtnt 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 diverging waves, inakwf xe0 1j1t,tensity 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 fromvw dkqoe6 98.f-xc1upsl.zn3 the source is I. What is the intensity at a distance 2d f81w6nux loe.cp9vf3k-s .dzq rom 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 sek ;kg-scd4,v ource that is radiating equally in all directions. What ha s;4- kck,gdevppens 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 a sound source that is radiating equallt,by6f8 yhn jrg yo;bx6ug4z 3c1b,(oy in all directionsgf6zj,ryyh ux 8n41gc (oot bb,;y63 b. 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 incre : 5douo v.ev bo5.gg(ncyy7b0ases 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 a pure tone. Whaticvm3 fgo+h9 7 characteristic of the sound incrc +i9fv og7mh3eases?

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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 noteuhd0i15etzx 03 u4st f?

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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 musi1 /hy5,u(mm)p cupvm lcal 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 waqpw- vc-x *3t mtq+)6d6gz pgmter

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displace/vn;ezm1x bl d c,)5ivment 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 thf dtil;v/v 3 lf+.gh8fe sound wave generated by the guitar as a result of this vibration. What do these two8i;t fv3+v f ./glhldf 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 hr3eorp+n; +k :x) wyqwhich 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 wavelengthfjlx6 pd3(b.ya/ fsh9s of the three lowest tones produced3sa 9xf/pf.(d lbyjh6 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 nqc ;td/tho9rr7mu 7)/i3m fkan open pipe of length L is 200 Hz. Which one of the following frequencies will not resonate in the )thkc / ;ntmm/ d93iq7fou7rrsame 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 a qha m;-j31gy vd:zmz:x;p ;zits fundamental frequency. Which statement is cy;3gzqzahm-:v:1p mx az; j d;orrect?

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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 and clos.ql,l3eb2r j blyy,b b.()mdied 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 xnkslc8e).h6 wavelengths of the three lowest tones produced by this pipe)h6lk sencx8.?

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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 i0h8w1jd az:p h/d j,kjn a closed pipe of length L is 200 Hz. Which of the following frequencies will not resonate in th jj1 ,:p0/jhd dhzkaw8at 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 fundamental frequ 3mt9.d9: 2hreqtictw *kwsy :ency. Which statementstmch :kew:i*rq y. dt3tw 992 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 bdzy 1pbjt2gk0k1c ctemaw7 9 .6;k ;pfy the same source. Each speaker produces a tone with a frequenmj;ta pgtc17e ;fwck60 9pb12dk y k.zcy 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 ith:mi8f4-s u sound 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 beat frequency ic9x:9i mqp5 aio +a/qys heard. What happens to the beat fyq5aoq 9:ii9cmpa x/ +requency 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 explai6u eb0 ok8po3vns

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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 thebr9 0e9zq(cma obsecb e0 azr9m(q9rver 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 freqhne0 z(:yoa,djpug +3fc1lrdh:c8 o) uency heard by the obse 3ogad1 uf: )hh(rcy:zdol,8jcp+ n 0erver 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-angle willx o+ t-a:i31uz,k)fidk8jbs nu5y n; a decrease by a fxkz3ua8;ti i15a) nb: sn +yduo,kj- factor 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 fu9q.ml y eyg3lh j1nwh )22lv5requency 45 kHz in air is 352 m/s. What is the air u)me1lqv3gyj2 .9 wl hnl2h y5temperature?

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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 speedgv8vczw 58c 0 zm:uc*e3(j9kdv l gtw/;q;xdm 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 sp8xnt ehsq +dx. vo2(g,eed of sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.02v q+td.xh ,gx2 (os8ne50 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 fpoksu1.9f; ob4p,cuhear the echo 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.lkj+mc *+ mq:s0 s after seeing a flash of lightning, the distance to the lightn s* :+clmkjq+ming 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 fromqr7lt8d9g+-x 6qau lprc9j2 -pj:,wm r 5 nwvj a cliff 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 s*ph 79izxvpd7m;j jo0.f+;z nq gk*ogplash 2.5 s later. How deep is the well? (Ignore air resistanc9f;k xzgjm 7qin7;phvz*d+j o g .*op0e, 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 frequency 5007ps/. wdhj1a y 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 airzg-:g nb tq6tw :1r7x ;+uvkvv 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 a sound with intensl8msco+f, 1 c/jyoh-pity $10^{-3} \; W/m^{2}$?

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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 9(js owhz8rtz4cl.5 hsound?

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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 intvo b o4qu9ffo 0.d30ubensities of two sounds with intensity levels of 70 doo u0.0bf 439ofdbuvqB 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 rzh2wva -fj4 1garage is 100 dB. What is the intensity level generated by one engr -1fa42j wvhzine?

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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 9mq, *yewtft;lz y 2c))pk -ldof 6.0 m from a source that is radiating equally in ay;y)kq2d- w*l)9ttcpel ,zfmll 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 a source tha 4-k18htsfw fb.j nope*;.bxtt is radiating equally in all dir*1n4 s8; bjk xofbft. .tweph-ections 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 uniformly d/e)l:)d.9mww2 r- yyo wm x a7cgfr6hdistributed in all directions. What is the intensity levelmyc:.xwwl/7mw y2rdd e6)ahf-rg9o) 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 dog. Wh8k4 .2bp hv;a mbi6p3k(fbr tbat would be the intensity level if two identical dogs very close to each other are m(b;6r.4bhp afktkp2vbi 3 b8barking?

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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 intensitywl8uc -,,;q y +oeb9xlls u-lp level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that theowblp eqxc-u9+;-l 8, ,ls uyl 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 is 95 dB. +5jl3+(oda fgqij; vmp9bvxxqwu8 :* At what distance will it be: wmp++ 9 uivadx35x8oq(q*bjlv;gf j 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 the pgx); f .(:zmdhj.hdj frequency of the fourth hjdj f.hzg (;mdh.):pxarmonic?

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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 Hz. What is the :b2 rypk9ski o,, x4 cqqfdol19icf c9; g1l5glength of thiq :l1if o 9kqgy9b2dk p, ;14x,rlcsgfco95 ce 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 isma .0l/lf n8zqcws- bi0cl; :t 400 Hz. What is the frequency of the08mcqwfzl 0/ :lbt-ani.s;l c lowest tone that will resonate 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 en/0kc5sb / j /7qdboprnds has a length of 0.80 m. If the velocity of sound in air i7spd / oqj/r5 bkbc/n0s 340 m/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 roog9lbhi, 9toj3 m where 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 frequenc ikh2pj+ swsywq 3l,-5y in a pipe closed at one end is 330 Hz. What is the frequency of the third har3,y h2j+l-swpk5q w ismonic?

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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 on+ -v:j y93fzhhfxfu8i) rsl ; hrq *e3szlb1b4e end that will have a fundamental frequency of 60 Hz on a day w+ 9x)1b l3fqf i uj*v 3:zhhser-h;ybz4ls8frhen 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 a room where the temq+)9s(rpftqp perature 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 tempera/cw*k y8y,tnmhmd /4p ture 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 plac/ wg5d15zym jyed when the speed of sound in air is 340 m/s. What is the fundamentag/dmjy15 5c wzl 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 sa lqc9(y2ljs88uct7( hrm 7 :nolul*rame length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 30((*tc2:y qlru7n jroa7cllhs8 9mu8l0 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 frequency of 800 Hz i-0c98o *f(zuxiwr gh.q .leom u *k/ozn air where the velocity of sound is 340 m/s. How much farther back would sourc-(*0 cxfu9/o.ro*wleoh.zmk uz g8i q e 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 placed side by side and driven by th l8 5n+ugx7cpre same frequency of 500 Hz. If the distanccr5+x 8un7p gle 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 freque u*f)+p1dgm dpncies 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 frequency of s)..ra gayxj tk,76tba musical instrument. If the tuner hears a beat frequency of sk, rg.t7jax . )6ytba2 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 so rhx6lhkbp/9, f-zjt909 ghgnunds produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity of s 6/-ph9gzb 9g9 nlhjhxtfr0 ,kound 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 violike: yzb( /g9trl zul5/ns 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 gze(:9zl/ rlktuy b/5of 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 og yak,p6*nz, ni )x-othe speed of sound. The observer hears a frequenc*i6y-)gaz,np,k noox 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 stationary obf7pggbzhm 0(0 d-+xot server at one-half the-ohg gzp +bx00(tdmf7 speed 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 frequency of 1000 Hz. If a lisgyx4 397bmn6o sl)4ecawlu-u tener moves with a speed of 30 m/s away from the source, what is the frequeny4xc gl 6mw 4b-ou9sl7 )ae3uncy 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 at 35 m/s on a dx)hf--t28+ (zs.w v x7 gnoapyr)kwmnay when the speed of sound through air is 340 m/s. The car approaches and x7+f-rm nhky ))n.gvt-8o wxspz2( aw 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 train approachesugh2+ negjv nx/m,u8z8r::k9ph0b1fd 2 ms ex with a speed of 30 m/s. The frequency of the traxf1u0h 8g:d+evjxkbh 9m u22m ,gn8 :rpe z/snin 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 itswd- ( 8ppzi tptn8vuoaha044. 400-Hz whistle4whn 8ud. -z4vpitpoa( 0p a8t. Take the speed of 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 fazn, +9lbsm2train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you heara+ 9lsf,nmz2b ?

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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/ff -enttz.oh7a*,t h8 h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. ftth nfzo, h a87e*-t. 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 al )s7; 9tijzmxp ssc;:way from you at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual freque9m z:)lss;s 7x pictj;ncy 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/zm2pa- sxyvvt0c .5x is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train with a spez.05cvv mya-/sxptx2 ed 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 5sav 80nxk)cl. 00 Hz. Assume the speed of sound in air is 340 m/s. What is the frequ vcl8)n x0.kasency 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 determinejno/z1r 81gkurk )(jr the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 34rgj1(r 1kn/ o)ukj zr85 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 wave produced by a n y*- pp:r zej23f831bdxabtrsupersonic 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-anfeqtit* 4 )qneg3fu(v+9dl0 jgle of the conical shock wavdt0 eqj+fu 4i ( lgq*)tf39enve 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 E)i:z2q5 ye h0ocz-ge h2bczn3urope with a Mach number of 1.05 where the air 5 zh2c0 b:)qg2zi z3cheo-ny etemperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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