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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 ih4c xb/ yodvf1:z .sv,s 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 conas/d*qxc: 3y ea2e+kw ducted 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 soun,zxm8mx-; u8vhx 2 w am)gl8wnd 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 incrxesfd/g7;a2 m 9kog v(yvge0.4m ,lireases, what happens to the velocity of sound? (Assume v.dif(72 amr/xv4e0gy og gkle ,sm;9 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 velocity of a 200 Hz3ya,s0ap5jovew*0:ku os sj7 sound through air *:, o ek3jw7s ysjs5a 0puavo0is

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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 qmtz+0vnk6r8ir0: yt a 200 Hz sound in z 0+v6 qkirrntm8 :yt0air 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 calleo7 km6b-;mwey d

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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, w*9uea)jcsv 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 unif3 9vrahxpfr). ormly in all directions. If you move to a pohxp var3r.f 9)int 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 divergi2e-1nay t2smalh0v5et9lmf1rm 6+lg6kjy q: ng 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. What r.xw aw/p )0n-q;o qcxis the intp-wq ro nx a/xwc;).q0ensity at a 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 sourcxzyps4- qc p5szh7gct51/5z fe that is radiating equally in all directions. What happens to the intensity of the sound? It re4z/p5h c 5sp gy7 t5c1x-fszzqduces 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 f-s)r0s/fu(wwkf p 5 nzrom a sound source that is radiating equally in all directions. What happens to the intensity level of the sound kzups0 /-w(s f)n5frw? 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 -vntmh**zo, ,hfdgc.ox.w6z+a r1pfund 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 pun.34o. u+ 4hw cf-gmmlghu zc/re tone. What characteristic of the soundwc4h/u zumcn.+ g .3l-ghfom4 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" of a mu z k84o5ll7quy fjbp*7sical 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 musical zna w-b.ni20(h 8dlm cnote?

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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 lo.5s6( jrmpm8 p*2tr5hxietinto water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wavegp01 pt 3,nsh;w9;uakowqy . xs 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 5f*fbhl tyf10n4c wh5 string and the sound wave generated by the guitar as a result of this vibration. What do these two waves have in commonb* 5f ht5wf0f14 lycnh?

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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 bothfy l*(szoe7w5n+a i m( 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 waveleny-3i 6.:(w lbjlfffphi .ith 0gths of the three lowest tones produced by t-hf6ifit wibljpl:( y .3.0 hfhis 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 oplhpdpb m4v(m sx/;5 2yen pipe of length L is 200 Hz. Which one of the following frequencies will not mymlp/(pv;d 5s2 4 xbhresonate 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 hm (ycdl,u5 j4b9e9lwresonating at its fundamental frequency. Which stathcd4ulw9j, 9 5e ylb(mement 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 is open at9-ex 2 s7/kgu)7asse(sf i)uzl3mwds 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 arwa tuxx w+p6u ;x6.4are the wavelengths of the three lowest tones produced by this .;4pu+atwx6wur a6x x 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 lwimlg;s i*0k 3oh35q(x: wcl eength L is 200 Hz. Which of the following frequencies will not resonate in that pih(s 5 wleqki 3ig3*:xlco ;mw0pe?

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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 frc1k(p g6sfz(j0wida5p, - p6e ttdam5equency. j-5,wdiz (cap (5fep61g tatpksm0 d 6Which statement 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 twluu9fjv )1+dhyz q9n 2o speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz oh+y l2uuz919jdqv )n fn 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 b0 *da(qbin6a deats, 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 an wot.+e .4fyhkd a particular beat frequency is heard. What happens to the beat freqhw4tyo. k+.efuency 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 explaik3 c 2feu)dzy 9sjaxzwdd8f(jk :j24-ns

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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 he+ apr9a(s0 thitfd 0j.ard by the observapt9ta. rjhd( s0f+i 0er 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 xb :q /m9m9 tg*/tfmurstationary observer. The frequency heard by the obse t/b:mm9qt9 g/frmxu *rver 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 will decrease8ler1 0h0q c95zo zwfb by a factochz0l1o5r 98bq fw0e zr 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/t(htk;c4(n l( nbz3 i1lel c:js. What is the air tempee3 n4 (b(1:ntjklzc clth(l ;irature?

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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 o6hok13ky*1ei nwp 8obf 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 +m gzlo/*0 jcwis 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected bacw j/gl+z0c*mo k 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 temperature iesf /n- vvs6enr 9v);ws $0 \; ^{\circ}C$. 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 af(1xbop9tlxz 0 ter seeing a flash of lightning, the distance to the lig9l(z 1xp 0txbohtning 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 from a cliff on .p:xw xa2q7)rbjfcv5a 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 later6;)ghjlgzc8;knmf intdp; z xr oq (p d(n7+30. How deep is 3zr;gco 8njzp;( 0txq+6d7gn fdl)hni p (m;kthe well? (Ignore air resistance, 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 ofiqvye *ah-141rsgvr/ 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 ai)ffy3 rl wvygy*(t8agd , (j)qr 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 intensit6 wd( +j etm. 7c)gtuqxlkhg91y 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-dB soundztxfzi(, 0efei n+5s-hx2p 1e?

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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 sou olr84k w(e )j1xdvo*rnds with intensity levels of 70 dB and 40 dB?kre 1o*48oj v)lwxd(r

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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 10 gye)4a(- aarv0 dB. What is the intensity level generated baay a-r eg(v)4y 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 i. u9kn iuwuy1lsxufgz03 5q;3s radiating equally in all directionk. ;0 ulnzuiuuf395q 1sxgy w3s 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 fr7hfgjn4 p5;o41vgkzg, yh;e9qtgty5 om a source that is radiating equally in allzg; 4pg j1,;g oh7y9gh ettq5nk4fv y5 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, whic)cl s58 d*cfrfh is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from t*fs)8cr 5dl fche 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 barki 0t/ty,3kl8 ojljtu x.ng dog. What would be the intensity lev8yl tt,jtj3.ouxl 0/k el 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 sourc ,aza3c5 hl5q )5jorlve the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the souczl arvoqlja h53,5) 5rce? 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. Atcs7f1p gar36s d8we )j what distance will 1j7w8 scf3a g6pde)srit 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 hbcm 78pjtr6 b*,;viwure.kri ;xqj*)as a frequency of 1200 Hz. What is the frequency ofr6 p x 8r,.jem7i;)cbjkuqr*ti;vbw* 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 open pipe is 900 Hz. What is ,:fz e12sshb +2.at ll+-uf z3gg9dtdt*mls ethe length 9*.2tt 2gf3tedaz+h,d:+lzss 1fms -l ug bleof the 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 inzgi5n35 +pzz ux u/ure-y f,r8 an open pipe of length L is 400 Hz. What is the frequency of u5pyur +n5-zzuzg/x i3 ,erf8the 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 ends has a length of 0.80 m. If the velocity of so u9x.2mks b7.u,q df fx 3-,5esoivuwgj6;na ound in air is 340 m/s, what is the frequency ofbs6vmi 9nxf3 jxawo5q,d .;u.o2uf-u,7sk e g 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 whe-yx zmw,nfao+ s7-m(ere 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 end is 330 Hz. What iq *6r0e x9pkvos the frexor*kvp q960 equency 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 pipe closed on one end that wigi:obrs 5 s-h5cj x:;fll have a fundamental frequency of 60 Hz on a day when gbhiox:5:;ss5 fjr c- 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 v.2z/xpjjw,u o6w s9v 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 temperature is tan0f zug2ewxf( -x ;.l7 rb ,hjw/5thuzj 3d/$20 \; ^{\circ}C$. 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 why6sbm;vf)+0fxhai (nzr t33w en the speed of sound in air is 340 m/s. What is the fundamental frequensavnxi) 3zr+6ft 30bf;y hm(wcy?

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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 on.o )fd/r 6nulze end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of the closed pip nzdl/ro6fu). e?

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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 in air wher )tnn(9b*pnjhd/c 4 lbs j*3ixe the velocity of sound is 340 m/s. How much farther xisj */9nd)p *nb hj3clb(4 ntback 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 placed sid( ,x fcyx+ph9w4f.sh ge 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 the following is a possible the disf(s f4 .xhgx,yh+w9pc tance 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 zuc 9g9icat.: os+lbkmt 7/.wHz. 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 for. ag5aru9 kpd(,,vdchk to tune the frequency of a musical instrument. If the tuner hears a beat frequ v5 ,rch(d9.,gdaakpuency 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 two horns are 6 m and 7qcz 2ghndyvv4 1z;.uz6y* vv3 m respectively. What beat frequency is heard when the horns arh6gq1vz .uzd42; * vv3zvynyce 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 violins in an orchetq z00 g2oool)jk*2d cstra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the odcgoz0 j)l*2tkqo 02 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 sr 7 6 wdj.7xgfc8bjzef9m4*niource at twice the speed of sound. Thjx efnfd. cmg47bwj6i*87zr9e 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 frequency of 1000 Hz) approaches az-qx1im l2w7fn3lg q3k1z 2h x stationary observer at one-half the speed of sound. The observer hears a frek7mi2gqf z3wxl2q -1lx z3n 1hquency 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 mov 66 yks 6kn2,9we )no)njfmguaf- k-zses with a speed of 30 m/s away kns,2mg-nw6n 6 fsu zy)k-)fjoa9e 6kfrom the source, what is the frequency 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 d(ds3lghqme 1va.l+-7ia -xj*f1roqyb)+hq traveling at 35 m/s on a day when the speed of sound through air is 340 myrg vose1+ .mjdl1qq* xd-lhh(f -+biq a)3a 7/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 stationary observdk zxq8g2hp*yqc1 ns5-m ;7n ter when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the spenx;tkn2sdc -hq g q85 z*1m7pyed 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 trai n7iirwt+t( 4 pea6r5hn blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you het7i+aw5p6nti hr( e4r ar?

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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 station2 iiw0zzq3nw 3ary train. The train blows its 400-Hz whistle. Take the speed of sound to be wiz3 z 23w0inq340 m/s. 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 htu+gi*xd(;e;z(h ce km/h. The train blows its 400-Hz whistle. Take the speed of soundzgh+ (t c(hueedix;*; 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 whistlegu7huc 0 3ir3d, and you hear a tone cru7ug3 3d0h iof 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 50 zxpii9o9 8.lh0 Hz. Assume the speed of sound in air is 340.9oxpih9zl 8 i m/s. What is 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 + hpt o/-mmxw*is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the obsehp *-m+wx /omtrver 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 o x1qs60yx2 xzpev9 ;dwbject. A 40-kHz signal is sent out, and a 42-kHz sige 01x2wy v6qzx;s9 pdxnal is returned. Assume 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 wave produced by a supersonic aircraft i5v)mmegsot 8- s $60^{\circ}$. 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 qd/g)v*k .x x)qwjj9wof Mach 1.4. What is the half-angle of the conical shock wave/v* ww j)) 9xjqdqxkg. 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 thr9y*z ahs:5hkbas 7rd) - dx0be United States to Europe with a Mach number of 1.05 where t0s)darxkr:h*5 9y-7zabsb h dhe air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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