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习题练习：Physics Unit12: Sound
本习题练习试卷来源于无忧得胜-网上国际课程 (https://5edu.win)， 为试卷打印版，您也可以在网站平台(https://5edu.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://5edu.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: admin  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 fals /ct8 (v4o66z xohjpqgvab*m z,mu;u1e 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 conductea 1y+7hnfymm3 )np dc,d 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 steel o2ylfz 2x9r9f 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, 2* sa,pde( mcs+xxp 6bwhat happens to the velocity of sound? (Assume that all other factors remain co+sa (6pm* xcb2xsed,pnstant.)

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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 pqesypgh0: c )e f1o)(sound, the velocity of a 200 Hz sound throup1:yogp0 e ))hqe(fcsgh air 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 Hqk ( gieoe;/wv sc5g z07m/,nfz sound, the wavelength of a 200 Hz sound in air isg fm7(e/c5o evs g,qnw0zi/ ;k

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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 greaterun (pta h:7cq* 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 less than 20 Hz aref k.d .tv02pam 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 uniformly in all 2nbru. a; n0mpuw-d w1directions. If you move to a point twice as far away from the ub02;a-dnrm w.wpnu1source, 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, intensity *q+ i)zkqc)ee 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 is ty-x l gtew1778c*nqs4 rw tye7he intensity ate c*71 xslygt47-wyr8qwet 7n 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 dista xkvnpp5 ,4g2aax wjcs2 :l/5snce from a sound source that is radiating equally in all directions. What happens to the intensityws ack/55gp2n: pvl a4xs, 2jx 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 t2a4oa 4 rmqm5,oadb x8xv )fa3hat is radiating equally in all directions. What happens to the intensity level of the sound? It dropsxro3m 25da,af qva84 m4ox) ba 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 sqx0v ohy93)z dound 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 emitt icjj5 -*n:af 5su7op6x lu5sring a pure tone. What characteristic of the sound increu u*:f6xr55oc-j 7npsj5ilsa ases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudx6kkzk)c-w3r e5j1 rkue*+f eness" 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 musical no);b4uvx ;btzwt g3j78y 0rdscte?

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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 ya9f9 nzkt; o:water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displace 8e8yq ldx i6*emf5: l;n/usxement 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 standinm(0)ql, r ij9a pzrok7g wave on a guitar string and the sound wave generated by the guitar as a resuorkm,qlp7j a(0r )9zi lt of this vibration. 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 both enq .+7fft8th( vzlgl1w6k 7fjjds, 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 6cykk yrfi c4h0 +f2m8wavelengths of the three lowest tones produced by this pih 8fm krc6+fyyc2k i40pe?

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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 ia msu.us (* :o2fb,xwmn an open pipe of length L is 200 Hz. Which one of the following freque:fso(, us .mmxa2wbu* ncies 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 fundamentalgw9p -uvol(z( frequency. Which statement is correct?uwp( o-(v lzg9

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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 the other, thefm06l.kl8ocp-cs p jn 3,1cuqo,xo+cre

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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 let+b+ y3hua,n*ic87ulkn r8 oongth L. What are the wavelengths of the three lowest tones pro,8nb +uru ntlk8 ahi37*y+o ocduced 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 resonate in a closed pipe of length L is 200 Hwqmt6tg hdg:ci+kl;g9 cr4qf181j7 qz. Which of the fol7:wf1jt4mg;lq 1 q+qr6 gth8di gcck9lowing 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 endae gmuu b +0nznms14q- 2jf97kn-tx2y is resonating at its fundamental frequency. Which statement is 9k ufnnz2 1bts mm-7uq4ej+n 0xg ay2-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 thetc e;lgyck3-2cn cb2h/ 1gm, o same source. Each speaker produces a tone with a frequency of 200 Hz/cyth ,22mgcbcno1c e; -g3lk 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 sound waves should hah5 -0ya aus3flve

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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 sounc,aay q-quin(iw 8 , -tnt60zkded together and a particular beat frequency is heard. What qcnyz a- nq k8wiuiatt0-,,(6happens 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 exp-m4 m8 rm.hpmplains

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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 stationar ;vc-0/o sgpkoy observer. The frequency heard by the observer io0 -k g/posc;vs

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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 stationa g6j9.z hn8qjs/ asak0ry observer. The frequency heard by the observer s6jah/j8q.zn90gk as 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 i)fg:/xkn q6 p:y1fdg uts MACH-speed, its half-angle will decrease by a fauggk: qy ):1ndfx p6/fctor 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 ultrason: j4m4dao fw.xu/j sp7ch7xf4ic sound of frequency 45 kHz in air is 352 m/s. What is the air t:d/4ua f7 xjow 7x.4jmps h4cfemperature?

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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 ww0mhv1p7.7ny c7j nkair 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 s-p v3hbvf8osx+ir 3.o hriek whose echo reaches it 0.0250 s later. + .roh vp8vxb-i3of 3sHow 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 +tnls;+wr.hoh 5io)a, and hear 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 5.0 w hch) /8j :pdy*zpjupn7s8ribtqi: ,gd :h81s after seeing a flash of lightning, the distance to the ligh8ipr1wh/d*j,hz p dg87nci )p::tbq:yuh8 s j tning 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 a day the temperature is jm: ,3cde+ebd$15 \; ^{\circ}C$. 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 deesf;kfj ,d; zum:wd :7hf+g* qup is the well? (Ignore air resistance, and assume the velocit um*kw h7fgf;quzd; ,:sj:fd +y 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 sound2 emdc*zjf8/znpw/ *va ,rp i) wave of 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 air at -qkdz 8t7w o;pz/ecbq (r;g; m$23 \; ^{\circ}C$ 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 in4nnj7u7-y 5mf 4hoh cqi f+2entensity $10^{-3} \; W/m^{2}$?

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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 c/h30aljwqs637ub k hmfio42of a 70-dB 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 if +7iujhn4ll+ - 4vdeentensity levels of 70 dB and 40l+v e4ih nfe-u+4d7jl 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 is 100 dB.vbxo;ny/4h(qwuup53 fny3kil +3 o7 n What is the intensity leboy+ fqn;3l wivkn7 np hy(43x/uu o53vel 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 di.frnhx8iius ;. (gyz -stance of 6.0 m from a source that is radiating equally in all directions is.x -hg;irs.nizf 8(u y
$6.0 \times 10^{-10} \; W/m^{2}$. 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 that is radiating equalkpv0pwdo0g:bq s3n )by.l m),ly in all directions iovs.pl):0 y)pbb mwg ,d 30kqns
$6.0 \times 10^{-10} \; W/m^{2}$. 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 o/opyr( rkrrt6apx/ 0fk9ckq 714oi 5d vtf7b-f power, which is assumed to be uniformly distributed in all directions. What is the intensity levd f6iqp 5-prt k07 (a1xkrrooyb/rt/c 97v4kfel 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 md2o ;u*lhj 1bz6 tl/zag bd)l- from a barking dog. What would be the intensity level if two identical dogs very close to each othbz ;/d6azll2) tjd1ugo*b- lher 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 intensitynm0z6l.+wr7 *cjoyng a7i :m h level is 60 dB. What is the intensity levelnwno ic 7.ma0 mh7gr6*+lz:yj (in dB) at a point 2.0 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 kp(/ 9q4tsyawwill it be 75 ky9/asq4wt( pdB?

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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 H6.mc )oer/j* v obb.l6prkn6 dz. What is the frequency of the fourtoj e6.rcr dovpbk)l.*n6/ 6bmh 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 uqsm q6tz. ixmc(5o/ ot,j0/i 900 Hz. What is the lengthqjomizxt( ,//0 oiscq65. mut of 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 in an open pipe of length L is 400 Hz. dzskru wzbmq xmtt,0 gtj;.:ht 5)2-q.t 70wy What is the frequency of the lowest tone that will resonateg7;s t 2htzxqj0m)b:qu .wdtm.-zrk twy05t, 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. I(6fwd+ ozpz 6f9(gm ixf the velocity of sound in air is 340 m/s, what is i(x69zpw+ofzfdm6 g (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 where theg,8w:6fj6ou w;ch+ghfda f nzwe .w +; 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 frequency8g-q:hddo v; r in a pipe closed at one end is 330 Hz. What is the frequency of the third hd:rg; v-qo 8dharmonic?

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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 piptqp4g4o*p 0nwfnar-7 e closed on one end that will have a fundamental frequency of 60 Hz on a day -p4rnn47g*aofpq0 t w 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 room where thsmuir121- w,b kuf6l se 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 temperaturj:-)r0 c48+kh higg gy3inio ze 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 spe beyf(0bjqs7)ik *p1led of sound in air is 340 m/s. What is the fu(1)ejp s0l7bbqfi yk *ndamental 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 othes; 7kb+vfy8cxs ;-d cbr is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of the closs8vcy+sdbf -k7 ;c bx;ed 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 in air where th t.f(b8scj *3dw7qwgde velocity of sound is 340 m/s. How much farther.jgtwfwq7(c*dd 3bs8 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 placed side by side and driven by the m330mlu(xaifkn)y7 n 1gf7 tisame 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 distance from the person to the other speaker? (Tif gymn(ku)a1i33t 707mlf nxhe 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 frequen p,.prh8o7 iime)r3ny cy?

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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 tuninlla305)2e*fxdl w8lewb 6 fn mg fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what i3)elx065 mld 8wlfblean2*fws 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 e,y3: 4brj 4r ue+auzttwo horns are 6 m and 7 m respectively. What beat frequency is heard when+:e 3,rb4zar eu4juyt 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 violinjyf u*7dgw9v7g3mz /fa p +ild /jqv0* strings on two violins in an orchestra are found to produce0/gvpzda* uvwdm/ 7i fg l39 j7+fy*qj 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 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 stationajs .6vx .)kh,2-5fda 2y9brt fyrlkbqry 1000-Hz sound source at twice the speed of sou f) t,yrlb26vhb.kj9a.- skyfx2dq r5nd. 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 frequenot2o go de,97fcy of 1000 Hz) approaches a stationary observer at one-half the speed of souoo,2f go 9td7end. 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.p/tl 0m c-uywfcn**3rd :ye .k If a listener moves with a speed of 30 m/s away* /.cy* r3cnue0-pmdf :wytlk from 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 traveli; j:m5:5w w4j qi xok:gvift)zc6mv*ing 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 roadsiq )vz5jtwfm i:j:k 4o:vi6 w*5gm;xic de. 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 approaches w4fj+yagrz 0.g,k(t kocv/2z07 ylvmwith a speed of 30 m/s. The frequency of the train horn is 600 Hz and the spgv72zzyfokat4(+mc0 w0 r k yvl g/.,jeed 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 g0 2l,bf,cthj its 400-Hz whistle. Take hf0 ,cg,tbjl2 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 t6+-+se-k of a*x vtfvifnug; ;rain. The train blows its 400-Hz whistle. Take ts*+; +iofk-6n- va vuf xget;fhe speed of sound to be 340 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 yomi:o(a1g 7mm yu at 120 km/h. The train blows its 400-Hz whistle. Take the spomm(1a :gi7ym eed 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 yo9pwmk sw;r./ ;ms(wogu 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 frequency of the whis sm9pm;sk/w .(;wgowrtle?

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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 ihoo/7 eh/9 lgwcl sq:6s 500 Hz. Assume the speed of sound in air is 340 m/shhoqslo6 9c 7w/g/el :. 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 is 500 Hz. Assume the n,,t aqn6(cr+6* wqbyd r-yldspeed of sound in air is 340 m/s.d,r*qr6n,w al+dcy6y tq-n b ( What is the frequency 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-kHz snc- n (wx2 ) kp3 f6o;fuqy2qmfj lpl7p:h3)foignal is sent out, and a 42-kHpu:h yo3o 7 c6qkf2fq)p23 px(nlf)wnj - lfm;z signal 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 wav,jgzup9su0 6d jknf/x 1+v*wne 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 shoi6gf/23 yt/ccou p :umck wave formed?t/y6oucp u 3gi2c:/mf

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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 wf04q8 v) jpd9x;oe3 vvhh5 rnyith a Mach number of84v9p)y vhe3vx j5norqhd;f 0 1.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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