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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 is a false statqjz ti vpb )yt/:zlik( 38x:t/ement?

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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 conductrcaz 5la,+yp* ed 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 sof -sh+kw-xlb5f k/6x pund 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 m0)cb8sa7 gjkq()hptthe air increases, what happens to the velocity of sound? (Assume that all other factors remain 8mjq(hp0 k )sbt)ag7c 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 xs7vqt 6me4w) Hz sound, the velocity of a 200 Hz sound through air7q wvmt)64xes 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 st )145ciwr:scc dcz0vound in air c0cv5:1zts c4dr c)iwis

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequenck8by*cbjo*p 9am d9c d )j;n;sies 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 b9zi24/ l;nzox gfaru.d5,j sfrequency 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 sourcl+*sxcwmn x2c5( 2mzme is emitting waves uniformly in all directions. If you move to a pointnmmm25z+xxs( cc* 2lw 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, intensitym5zv4 3 zotfz9t5j q8h 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 7k-p-g sotdx1 source is I. What is the intensity at a distance 2d from the soudgxospt17 - -krce?

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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 equalmj;,b mh.)9e urt(dx ily in all directions. What happens to the x,im mr; eb.d(t9h ju)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 equaa ul ma,:w ;yscx9g17olly in all directions. What happens to the intensity level oc9umy sag7wx ;la ,:1of 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 am7o (vym9gtt728yfy u+xdrw y ;ke+ kf:5 nu-m 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. Wh79g e dl*. yma9mzwmg(at characteristic of thedm (.m9w glazy7mg*9 e 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 "loudnesd c5; 3jjv1kxlh.9gsh(kz;nl6 gtl+hs" 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 q0y1aq;vu/ktoe: 6uep+ )ugq9jr 7o na musical 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 frolr1v eqv6ehw -ytwo3fh(/.o.b /1qi dm 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 displacemezq1r2p blfg(ng :e1i 5nt 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 guitaw9z7,h d9b-xk/ ab fvhr string and the sound wave generated by the guitar as a result of this vibration. What do these two-bhx7 a/fh k,dwvz 99b 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 bot ct*e c1tl fs4-l vz/r5)u5qcbh 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 lengthb btknee h .rda,l55r+jg.+9u L. What are the wavelengths of the three lowest tones produced by this pija9b +be.nu. rkt5d+rhl5eg,pe?

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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 ah o8u w2sc-rhs6 (uz/is 200 Hz. Which one of the followinouwz -2ca s8h6h (s/rug frequencies 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 frequency. ig*)j cpbk3 )gWhich statement is correcgki*b g j3p))ct?

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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 othb,9(ct6 hvfy per, 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 lengtq *bk5;ylr* ;j ivsho8,cg1oh h L. What are the wavelengths of the three lowest tones produced bcg5k ;; holqh s18jo b,*iryv*y 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 Hz. l+i 5u 2df8zcmf8t(ao Which of the following frequencies will not resonate in that pipe8o a ( l2uf5zm+d8ticf?

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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 resgzx+-s lur b7 1f-h5;prtz t;zonating at its fundamental frequency. Which statement 1s t;;x-+ rbflgh-7prztz 5uzis 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. Each speakwplxhw1;.q/ zn3 vw cl82;dmqer produces a tone with a frequency of 200 Hz on .;h vqn/ qpwzwxlwlc23 ;8dm1a 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 isgk kr * 0ojsjhrm ie09/x9jj +2,(onwaves 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 f :)wgmirc as8j4z b,(te0:wf particular beat frequency is heard. What happens to the beat frequency if the fiw,m)f:j (z: sgr84wet f0ac brequency 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 explainss yn+v1wg h z))b7u9cu)9s etd

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approachex5r-cx fk3m9mt+ f 70 v( ;nit5alaoses a stationary observer. The frequency heard by the observer mkril05va-x9m c+( n xft ts7oa53e ;fis

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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 heard by thermfo5y4n x9pme3eln *t7-a d+ observer aelm tn*od 9nx5-r mpe7y+f34is

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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 qk2ki80w:g ikm3qqruf*5 .zv, its half-angle will decrease by a factoru fqvqk qg8.:m2*iikwzk503 r 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 aiz0mjjx0.38tvfep4lou3 c 1c f r is 352 m/s. What is the air tvt.0 1ex cfjomlc4z33p jf80uemperature?

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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 c/9 woxf*r48jyeo7 sjkvy v .sx,n k*(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 bao4kd)ynstd-9 t emits a shriek whose echo reaches it 0.0250 n s-9)yd4kdtos 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 hear the echo in 4.00 s. The t myjxo a4ua+-)emperature 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 flash of lightning, the distance to tj(r ehrl-mk*pa+ 9u1mhe lightning strike is ablrr+eju9( a mmph-k*1out

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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 cliffo tx2b-nb ,p9f( di4zz 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 x11nta+9 b ulteuu2:5z+rqqi hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sound is1b+ute1lu:+i atqrz un x2q59 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 frey /4mj1rq)fq squency 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 ahi bu0(n*p3q po5s4 ebt $23 \; ^{\circ}C$ 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 zn s2/ uge65.;u 2iydoj f.sbnsound 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 st5, fgnbrf 88uound?

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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 tf hezgq7vfromn:*:h6h 8w-;d wo sounds with intensity levels of 70 dBf8:z hng;f -7qov:rmehd 6*wh 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 is 100 dB. What is the in.zg. svxqc 1/bxyon5 epfz6,,tu/( gktensity level generated/ g(,/vx ,x6qg.ze5sf.b pktounczy1 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 dist,f96da a,s vtrance of 6.0 m from a source that is radiating equally in dav69saf t r,,all 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 4 vb gu (1ujf5q5gja1a6.0 m from a source that is radiating equally in all duq(jgf51 15ga 4vu bajirections 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 unia/3bl/4gu t*ii-xdob0, vr*jh*wlk sformly distributed in a**twh3bub *djl 0o,vgil-xrsk/4 i a /ll directions. What is the intensity 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 6z6(8xkv n,o aiy *gued2 9p.fw5 dB at a distance 5.00 m from a barking dog. What would be the inta, p(x.8w2nfivy d u6e9kg*ozensity 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 intefn*bt ,45 ju5)w i klolqt/qe;nsity level is 60 dB. What is the intensity level (in dB) at a point 2k4;* )5 q qweblt/uoft 5lijn,.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. Aty q a,jccy9s-xfqkg-5ip4 57c what distance will it be 75 dB?pc9cf7x4cs-kj q-5yya5 gi, q

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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 hf s8:/uh.ebpm,9pv wsf. xomcr ,9.ekas a frequency of 1200 Hz. What is the freque:exe , p9s9k m,of sv.p/r.b8w.hf mucncy of 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 hfp -x6 .x4hrodarmonic of an open pipe is 900 Hz. What is the length of the p 4o-xpdr.6 hfxipe?

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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 5wmlx .aoe:.n 1 k*cs4xfw6ih length L is 400 Hz. What is the frequency of the lowest tok5 .x.ie*w m4o s nxfc:wa6lh1ne 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 i zzje5l;ql97 has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequjl79qz ;il5ez ency 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 roo9og7nzxm9e1 wy+ w0v mm 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 end is 330 Hz. What 7vl(7jsvhdda 5(o i0hlw8ua )is the freq7s v(h w)d ha5l8oulj a0(v7diuency 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 +md b/;qp.+kg9kujr wwill have a fundamental frequency of 60 Hz on k++duj9mg r .p /qk;bwa 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 room where the temperature is exy;xpgv430najz wf7. yi 6 wzim;w0.$20 \; ^{\circ}C$. 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 way; ah4 vo891 ca/tezthe 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 ai+8ql7)l ovmfzr is 340 m/s. What is the fundame8 )o+7lqzlvmf ntal 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 leng t6:zgp) u jm0uopb9i)th: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 H pojmtzup i:)09u6 g)bz, 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 ;gsnkap y nxcxuv2)v()h 08 -hfrequency of 800 Hz in air where the velocity of sound is 340 m/s. How much farth;)av2-0cxs vnukx y()gph h 8ner 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 same frequency of 50 1 tk7tr3cy4qka2g v9q0 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? (The sound speed iskr7q3g 2k vcq ttya419 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 thevg9(knvxqm*-j f h6)ovw1f:v 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 7+ q *nsk mo6fqbb8ey.w+ 2ijtfrequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequenc yiq b 6km+f snqjw+8t7be*2.oy 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 7 m respectivea8 eax22l/(spe e7rh ply. What beat frequency is heard when the hor2/hsep2lrpxe 78a ae(ns 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 violin strings on two violins in ajnw;- :zz es1ilt1, u)s4lp eds yg/l7n 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 onl 4jsnl 7epi-1tu),/lwsyz 1:ds gze ;e 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 sou/+:naa pos:.60cbxka x il il/xc:e/ snd source at twice the speed of sound. The observer hears a. ca: bxkscxelli6n +a:/0a:op//s ix 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 (norm md elps03* e9b jqv:spo/v )0kqt.hj.al frequency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hj*s090ve. .:3pmbql qps)ktejdvo/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 a speed of 34 6sczp9p/rpsweji: ) 0 m/s away from the source, whe)r6 ij sspc:pz94 /wpat 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- 8viuu8uxi/9mmw ;5k xHz 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 passesx5m98mvuux8 i ;kuw/i 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 frequency3-/7 cfgzx wjm heard by a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound is 340 m/jx /mc w7g3f-zs.

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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 tow 0-l(jd6kj(e/ns5y vfagn rk(5re/imyp xz77ard you at 120 km/h. The train blows its 400-Hz whistle. Take theel ndm/67an v5rx 5j (e-k/fy07y pkzrs( i(jg 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 t z9u hua e t)qbib9j+6gjz77i(rain blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What fqg b jzia6tih7 +z(ejubu)7 99requency 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 blows its 400-Hz wntir -1v9 jykh-g tn(3histle. Take the speed of sound to be1 r v (-ng9hkit-ny3tj 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 da7w mvkc4 +ql8(imd9its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is thqmdcl7v8mkwd(+ ai 4 9e 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. A:u,w a.d4c*qauu.5urq q .fcmssume the speed of sound in air is 340 m/s q aq.md r:q*uc5,.wa .fuucu4. 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 tr425zab0wk4vb7 7lj ijmr -u vrse.1gzain horn 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 approaching the train we i70jkvz jsrua5b .g174vr4m2 z-lb 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 signalv-7ml bdik3lhw- -j/ p is sent out, and a 42-kHz signal lpl- bw-3h /-mdiv7k jis 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 esz * -xok1 o5j53osq3cy gvm k81lfg)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 th1- 2aeqs1yx,ebtd5op) m z oq1e half-angle of the conical shock wave 11sq-oyt 5pe)m2da1 xz boq e,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 fli /kcte3j1 o.l gx so89k u9lwi/dff-m4es from the United States to Europe with a Mach number of 1.05 whkc 1sm.ud 8tfw/9fil-3o9oexj/gk l4 ere the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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