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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)y 8x kxe8ag,o 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 t6a8fnk:yb ( aex -ral*hrough

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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 rog,;uh )0xak nd 00lrx as9st2zd?

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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, x,l .n8 zhapxtdz4 o5nlw,0 j/what happens to the velocity of sound? (Asszxw,dhnp 5noal.l,xt/ 0 4j z8ume that all 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 velorhh m2hg;5py ers .7k:city of a 200 Hz sound through airsh5y2 geh:m ;prk7rh. 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 200 Hz s9pq9nlh* x yy wj:u+9wound in air iwqu l9xhwn9:yy j9* p+s

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequencievtij*e1*1er s w iaf-6s 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.n8 aurg 4e7dge(2mu0 ufbvu7 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 wav+so alj 0azlip/f3f: 5;wyk (nes uniformly in all directions. If you move to a point twice as far away from the source, the frequencl/f(lyfn +w35j:0ao sazki p;y 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, intensity is pn4lju,j;ky l9roportional 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. Wha2-ra ku*k m+x:b(po fgt is the intensity at a:*kxra-f+uo2g bk(pm 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 equally xm5z:d l6hhd8f*n z6iin all directions. What happens to the intensi xl:h mn5d*8fhiz 6z6dty 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 equally in a 5qup dzi80t1z1b/qil9 kpws- ll direc9diiq0b pzutp 8lq5s z11-w/ktions. 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 so+bbuu dwg7si/6 2 jioc6:((nst cjcg6und 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 tay4/e2h3 (u 1m lquxa)p5 foesone. What characteristic of thmp4xeluh2 ()y f5a qs1uoa3/ee sound 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"m6zqyy 2y4nc qt x9.k9 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 muae)h 8- ) n-4.uprnmqtt8w gkusical 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 intojj+xj)o - mzp/dt8/-zrcj ej) water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacem q*;xnxxhyz 92ent 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 souxsmej/2 q x. l1w xni,p7kpo+0nd wave generated by the guitar as a result of this vibrati0x m sqo7/w,pl nj2.x +p1kxeion. 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 which is open at bothz)nlav)ktdaz, q39y ua6nc0/ 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 th4;c zss(d7bt* 9lwnz ce wavelengths of the three lowest tones plw7c* ;(zt4c zbnssd9roduced 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 pipe of length L is 200 Hz. Which one o2xxfs 4nktx1 lf. bh/1f the following frequencies will not resonate in xx21fxt1lsnb/.4 f hkthe 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 repqj ll y6/y39esonating at its fundamental frequency. Which statement q6l lp/9jyy 3eis 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 is open at one end and closed at the7m5zhlh;ql2j y zkskz+c58pi5l:nq 4 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 le 6oxd)d9e-,ms z-dgf hngth L. What are the wavelengths of the three lowest tones produced by--eofdz,dhx dm 6) s9g 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 ob w/rt ilx4nnxpl( ,;iu: q)(vroux+( f length L is 200 Hz. Which of the followingubxx t (l+np, nrqwuolii ((r4:/ v);x frequencies 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 fundame txhj346icjpx:rt *f.:hei :mntal frequency. Which statement is correct?jxihc :tph fx:r *4i:m.j6t3e

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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 6c-o uaf8j7p82po j lusame source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed upu ac-opj jf28l678oof 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 iv+ wf;y )i1cpxhg-l9beats, the two 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 andk9v95 ma2b: r svknej6 y6yqw )i.pdm2 a particular beat frequency is heard. Whatdkv: ksw6bmn v92m r y.ap25)ey6j iq9 happens to the beat frequency 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 explainsj-rzu4fuhwd5cpu/jg y5z2/.t ,ydc 7s5r3 k q

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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 obs y ovx:wa1,tlbs6o0: svx0s, 6 o1wt:ol:sa yberver 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 he v4aop3k66rb u(do;mrard by the observekrd 6o(;mob4 u3 prv6ar 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 M f7o e(x9v* 3i ,jncbr/5jjdr.:nu pecACH-speed, its half-angle will decrease by a (jiee9dp. *n3,/vcun 7jfxj: bo5rrc 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 of2u pql*a2br1p3wy o01dt swbeg;v9l5 frequency 45 kHz in air is 352 m/s. What is the air tem9ls25ab2qw ed v u;0t rgbpy*op13w1l perature?

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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 sound in air av8 zro7pjk rjhka)5qx:w -1o6t $0 \; ^{\circ}C$ 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 ofnx.clh. tiy2, sound 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 hi.yn,xt2l c .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 echd-phd5slb r8 *uj+ e/iq*n-ih o 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 after seeing a f ap1uxhv; kcpz5 n2*w x,ep+t7lash of lightning, the distance to the lightning stret7zh pxn5xvcw2+apk*,p; u1 ike 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 day thkd*vo. 0g v 0h2gp;olfe 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 hearnsv5*8xqx 7x/v r ,g7r7udyy7:xaja:zw3xvu the splash 2.5 s later. How deep is the well? (Ignore air res 3wa7:r 7uuqvnvx ,y s7*xr5jz/ 8dvx xax:g7yistance, 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 hpmr)- 5y pow*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 oa+yqsaml 6k,:-nvd 7 $23 \; ^{\circ}C$ 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 sl,z1s ;ake7jyt +7bcfg hp* j+ound 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 b 01fte/w:iqfyn1 qit n99s:h 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 l3cm3erboy3. the intensities of two sounds with intensity levels of 70 dB and 40 dB? rcbm3l oye3.3

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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. Whaswf4i8 vv3w y,tutz)3t is the intensity 8f sv4 )uy,t3wzvwit3 level generated 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 8jvl*v32 hhpi;nft- iradiating equally in all directionpf 2j;ni *hv th3ilv8-s 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 d3kb*es m:s:aof 6.0 m from a source that is radiating equally in all d: *aess: 3bmdkirections 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 xf0 /f*gpsi/wu5 tyx80 bp:c lto be uniformly distributed in all directions. What is the intensity level at a distance 5.0xgb: 508/cs*uiw0ff/ty lppx0 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 doo ce-d0 p64osv))vgqs g. What would be the intensi640gvde)so-o psvq )cty 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 the intensity lzq zq+myq;2 )gevel is 60 dB. What is the intensity level (in dB) at a point 2.qqq g+ );m2zyz0 m from the source? Assume 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 is 95 dB. At what distance /p0dp irmt+1dwill it be 75r+1idpdtp 0 m/ 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 kp 2r;j k(moav. 8xjgbd+ ;6ooa complex tone has a frequency of 1200 Hz. What is the frequency 6; ;gra+o kb82poko(xj.d vj mof 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 harmog 8r:8z6 x8 in jo8xzhdocn+.ca,lg)s nic of an open pipe is 900 Hz. What is the length of the pgc8.:n6z i )caxd+lzogj8x8 onr s,8hipe?

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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 :jp hd4 roz(bu, qkyqc)+*+kxHz. What is the frequency of the lowest tone that will resonate in an open pipe of length 2L?*jzxyukdqqc p)+(or:+,kh 4b

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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 velociwxiyukl*o -ftp*ylv , /l q/k)a+7bk7ty of sound in air is 340 m/s, what is the freqo*x)*kbqkwk+vapl tlu7 y7l,yi/f/ - uency 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 roog.qu3qfiq5 6ym 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 frequency in a pipe closed at one enqjju y2:35kftsa )mktu(wy 0( d is 330 Hz. What is the frequency of the third harm(:52jm a(ufkyw s3tt ky )u0qjonic?

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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 will have a f f t:tykwpq hf+z.nc ,33efsko-+3-zoundamental frequency of 60 Hz on - k-tewfpz:+ syc3 n3z.ofkh+3,fotqa 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 a r8+ saq 8nq*ncboom 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 ;o 5t:-eklxqct( 7hcc where 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 the speed of sound in airu77 v0popy e1h(4bgxz is 340 m/s. What is the 7u p4 1yzgv0(7expbhofundamental 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 ow/tb-agl5 pq7 n one end. If the fundamental frequency lt-5 pwb7/qagof 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 eao of ,xf0s 5qp;)o gj3x ni**q9feui/ich emit a frequency of 800 Hz in air where the velocity of sound is 340 m/s. *qn0i oo),9us5/ p3 fi*e offxgji;qx How much farther 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 place:ax u xu07 dzsk. 6vy3ffyy+.hd 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 sound, which of thfavyzkufsxy6dy0 +3.7hxu . : e 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 beatj07hu fl l*1 apkz n //;*xudh0eut0ki 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 forkpsfw / le3t0r.bbq8s. to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the bp. t/swq3 f.es 80lbrfrequency 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 two hornso vxkx063ym+sq8s7 lv are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when tqv38sxlyo0v mk6 7x+ she 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 orvqms8xg 9*jyy3515/ d3mziiw4iuq a mchestra 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 s1/q5u y dm v3smm z9*5igyja 3wiixq84trings 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 sr(jj( d)ne)lt ound source at twice the speed of sound. The observer hears a frequency ofj()tn( r)ld je

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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 s1jnn +ya9n rjft0 /w3mtationary observer at one-half the spw/+r jjn9nn0y1ft 3maeed 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. Ifht,w-mchq,7+*jkq ji a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 34j q7c+t,hmhik,w qj-*0 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 80x(+7ru+nic g n0-Hz siren. 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 passes an observer who is standing along the roadside. What change of frequency does the obse xrc(ign+ 7+nurver 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 observeruqnty8+3r * ma when a train approaches with a speed of 30 m/s. The frequency of the tra3ut8 ay+ rnmq*in 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 its 400j5 5oiwxg76j q0:bg pp-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hearj0 p5gq 6oj5 :gwp7xib?

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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 it0d w+wm *2*g ou(d:wpyqv6z9ixn5vqf s 400-Hz whistle. Take the speed of sound to be 340 m/s. Whatq:ivg dw*n5vdxwy0* u+w2m(z 9opf6 q 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 bl wlyxyo nd5/ugg,8q5: cas3e /ows its 400-Hz whistle. Take the speed of sounuqw l /:/yay 5d5go8n,g cxes3d 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 jo+zr59k cy +uwt-3bx120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound z+-rkx3owu ty5 +b9j cto 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 rt/jg yd2lcer/i )p;; 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 speed of 30.0ic)d;ryg j p t/2/re;l 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 n d 3r (g6ymk c+ew*cezehpsw7+ogh28t516bt Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approachin tr8h g17+ p*byconcd z+3ege twkhwem52s66(g 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 vxth5q q1b)7i(z xl;o an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the spexqt)ozl7 5x ; hiq1vb(ed 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 wave produced by a 7*7 abl:rvwzg 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 ;/ ;4u ib7ulkvr t8mzlMach 1.4. What is the half-angle of the conical shock wave;kl;rl ui74vz/umb t8 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 Mach numutjn(yi91 d+f ber of 1.05 where the air tempe1(+ud tfjnyi9rature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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