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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://autoconfig.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://autoconfig.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 followiz0 j50fgy(thw yoxt)90qvr 4nng is 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 thrr0y/1p l8 ghffwc9 c*tough

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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 ro ,2 sehz9k3uh6kh2e2nh rv(mr d?

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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, wv6gz+k9- /pzpp1hc y ahat happens to the velocity of sound? (Assume that pyap v69z/g+ khz-c1p 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 ofp)c/o i5i29oyxod 5k13z s-8b ojkesf a 400 Hz sound, the velocity of a 200 Hz sound throu/ ozss5ibojk1ox9 y8d o2pik3f5 -e) cgh 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 Hz sound, the wavelength ofla 8pok - gwnhvs.c2i:+md5.o a 200 Hz sound in air im sg5-:pvnooi hc .+lk.wad82 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 frequencies greater than 20,000 Hz are calbrhxbft q 1bu/vts3-3:2d zg6led

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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 hyk7* x:5fiit 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 9wbs44 m (c(xn.x dthkis emitting waves uniformly in all directions. If you move to a point twice as fa.(dn x4scktwmx49h (b r 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, i4o+fgl+ mycfzuy m971ntensity 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 tl.qky1 8z(uhr he source is I. What is the intensity at8.rluk1 (qzyh 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 source that is radiating equally in all vvsa(u11c se, directions. What happens to theae1,1vsu c vs( 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 sourcel4v1u0c m dtf a(c.6u rjj;wn-hx);io that is radiating equally in all directions. What happens to the ic f.1j 6a4uj0t;(;-rlwm dc i vnoh)uxntensity 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-qf3idzr,8q p 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 a8axx2v;tm:vpa cf g3 , pure tone. What characteristic of the pag a8x 3c;2:, xfvtmvsound 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 musical hy k90;gyqmhwtj84 q 5note?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the "pitchqjm/4bo(h m pgvzx98(9 knw0q " of a 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 from air iuf7z4f33jwfz5nyl 0l8um a h25: tu: cxtapt1nto 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 waves are efc)(kda): i(oa v23c2 oisxd

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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 sound wave genewv dftt;e* 3z9rated by the guitar as a result of f* wvz;93e ttdthis 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 whif.t(.pi t9f j8rux6zhch 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 wavelengths of the three lr -2f1b4o2x o wrmo* )i(cdvrxowest tones produced by this pr)2omrfdx vib * (2xoco r-4w1ipe?

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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 u-m tjf)v:d(a nr:w ,gin an open pipe of length L is 200 Hz. Which one of the following f)-,njgvw utf :m(:a rdrequencies 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 fundamen;,k,)3ds bv(fz,fv+v7m my( gn qxvpltal frequency. Which statement isd3,m7 bl+km(yvv,zvfvs)qg;n (px,f 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 the other, ti :55rdj lr kvlk8z81ahere

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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 arexweplofdx053pg2 .hp;1wip, the wavelengths of the three lowest tones pro23 p ewox 0ppwxfh1l,pgd. i;5duced 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 ar ia3re3 m3t4f u0e3qn closed pipe of length L is 200 Hz. Which of the following frequencies will not resonate in that f33m ru3iet0nqe 3ar4pipe?

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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 fundamel.gv;;9pdcxq3 h j3iyntal frequency. Which statement is corred;g3ic3.9y lj pxqvh ;ct?

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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 t 8au(1jjo8upv)p1 2h un6g-aog pjz2jhe same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The p6n)gpu 2a p21jvopug j1-zahj(u8 8joerson 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 b4(g :iqo zp.wreats, 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 sounyv5g.fu3cwa0 2e9j0a5faqp qded together and a particular beat frequency is heard. What happens to the beat frequency if the frequency of oqef5p q0wfga. 50u9y3 avaj2 cne 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 explainsucy +nipg 24le2ma+k5

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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(1 ) sq7 n,qsecwctdo6 frequency heard by the observer iw1d7n),qeqtss (o cc6 s

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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 the orjlx5ui8 l57s4et i8x 4hlo4zbserverlsjrx 7zo he884llii4545u xt 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-angcrhu/* 7kmr +ale will decrease by a faacrrmh*u +7/k ctor 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 freque1bxj1tp(r7*jzac 8g.jg8a x rncy 45 kHz in air is 352 m/s. What is the air temperatc7(jj x.tab r8*z8x1agg j1prure?

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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 thyfwhmi1wp8wc3n eh/ :egg 63: e speed 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 speed of bnsmfl vdg:0anqx3p6 *w3um * 5jc-4esound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0x4 :pun*wbc*s qnj 0emmvld635-3agf 250 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 het3*0e.c 8tt o9zsp8r+a g:yfldwfk, sar 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 s after seeing a f,pk3)y nc vel0 p n:s,hbkfb3wx793mglash of lightning, the distance to the lightning strkel mb):sh7vnx33 w0,3 9 p,gpn byfkcike 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 dayxqv3o; v h0(wy 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 splalq7ama o05bsps()2 ae i04 wxash 2.5 s later. How deep is the well? (Ignore aexpm4 oaw0 q abs2 5s70lai)(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 o9h0.7 xbaorx cf 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 ai8g;/lxv- p7j 6lcrdc jr 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 intenos +;:h wahyn8xqp /,0f,elz /sze(wusity $10^{-3} \; W/m^{2}$?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensityruc 2b(s or5jeqr9)c * of 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 x5ubox. ew:)jv -nbnmxnl y7:o ku.4;intensity levels of 70 dbb:;4u.:ux5n7mj.n w xo -no)yvek lxB 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 ;bd 5n skr))u6r3lh zqa garage is 100 dB. What is the intensity level generated by bhs)rnrk ul5 q;z)d63one 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 r q3aswk*e ds-d.5wi*n ag6,hv adiating equally in all directions k6h d*aeqwasd, in- gs5w. v*3is
$6.0 \times 10^{-10} \; W/m^{2}$. 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 equally g- d7gq-xy3sld9 yt * xkxms.jr u7rfk7q4z ,4in all directions iss4glxm 39yq- u 4 d7j,-kstfxdkrrq x.g7zy7*
$6.0 \times 10^{-10} \; W/m^{2}$. 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 1sm,lr wa bf0 *j+m kxmb;bc16* mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distafk+mr1b; 6 a0cw *m*mjsb ,lxbnce 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 baq/.d nei2yd*q rking dog. What would be the intenye2q/.id n qd*sity 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 az;e;ij yy- 9r(*borlz sound source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equall*9ze- lo ybirzj; y;(ry 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 isg 9zqn1ppar ,ogx) z7:*axx0p 95 dB. At what distance will itr npg7) po g1x0xpax9z*aq:,z 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 has a frequency yltxee9 mg8ca-a.d .3of 1200 Hz. What is the frequency 3. dtxa9eea-8y.gclm 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 harmonic of an open pipe is vc,qt av4*mc0 900 Hz. What is the length of the mtavc0*q 4c,v 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. What is l0lh5lo70e o-dqmpsp- p s+i- the frequency of the llpol-5d0+ qh7i -smp esp -ol0owest 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 veki ws6 (+f1ol( lyn;ktlocity of sound in air is 340 m/s, what is the frequency of the second hawy s+ft6n1lo(klk (i;rmonic?

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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 the temperature is4oh-j1+ ls 6 v lu1u-baybz5cr2ixe5k $20 \; ^{\circ}C$. 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 onw3cqexb6 7*d: f ckkl6y-i*j7tbud l.e end is 330 Hz. What is the frequency of the third harmonilkct7*b dyf-*j6:673k.cbliqwxd u ec?

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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 close;do9 qirb,s y iw56n.od on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound is nd;y6 w,sob9oqi r.i5340 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 ev/v r2s*y: k m/imn)mzux,) uthe 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 a9deqxu,s0 :al room 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 iui l:8:iebx a+cb4/iin air is 340 m/s. What:u4/ 8:ie ci+bbxai il is the fundamental 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 lengtsx 8xxomzp m/jwy7 n5.2e*)zw h: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fw/jxmn e5*zwms.z 2 x8x7py)o undamental 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 emithx i0v tf-ugd:bov63( a frequency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther bavox- 0htfb:( i6 gvdu3ck 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 sidez: hk(heh21qc;d o w+o and driven by the same frequency of 500 Hz. If the distance froez (hoo w+1:2h;cqdkhm 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 frequencies of 440 Hz and 444 Hz. What is the beat frequen h31l, ,rxbs8tka9 dydcy?

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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 a musical insck+5 :jttzz;u trument. If the tuner hears a beauzk+:j5; t tczt frequency 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 producsv (3rac +, bnizsw5/zh9nv) ged by two horns are 6 m and 7 m respectively. What beat frequw)gnr3v+i cas(zsb ,z/v5hn 9ency is heard when 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 violin strings on two violins in an orchestra are found to p9 ud d 33gnko)n3xdz+xroduce 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 brinodd3g+xuzx 3n9 k dn)3g 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 therbqt( m: r,)ob speed of sound. The observer hears a frequency of)b mo:b(rq,rt

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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) approachm0lbonqhq+7 1cv(h v* es a stationary observer at one-half the speed of sound. The observer heo*(qb7v nl+0 hv1qhmcars 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 ofk5oes 7 iy-5vx 30 m/s away from the source, what is the frequency5-k veo s57yix 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. iphxs2w *2(y d/rqm5c It is traveling at 35 m/s on a day when the speed of sox(dyi5 psmq2whc *2/ rund 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 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 approacvedry:) p7:np0snz (ff)en l,hes with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound fv)d )reny:( zsnl:7f,p np0e 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 400-Hzyj6kf qlz,oe: 3 330yij tj8 porwo.hzno)2l2 whistle. Take the speed of sound to be oywieqj23rjopohk,8 .0y l3 t fz6:3)j on z2l340 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 trdq9 rrho7gh yxc) g/2/ain. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. rg) c hd/97 2h/yogqxrWhat 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 trajayl61pjnzto71e l *h nb 3z62in blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What fph1e2 bz3no67an6 yj 1jlt* zlrequency 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. Itw3t,plqazfozu-lkpn7 o 3j -k 1+e9w; blows its whistle, and you hear a npl,-ku39aj;o p q3 w7tokzez1+wf-ltone of 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 500 Hz. Assume the sp(. 4efypc7 ycdeed 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 30.0 m/y( p. d4yccef7s?

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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 speed of sound in air is ,x+s1so q1d y2v kwls3340 m/s. What is the frequency heardv +1o1s2dsqlks3 w yx, 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 signal is3 rhik taq6*ippfb-tfjp *-(: sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the object mf-pr* a pipk-bfh6t*j (3qi:toving?

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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 sh5ki/n d4i +cyuock wave 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. Whatq*cm+rw ;9gjj2smb392k lgrd is the half-angle of the conical shock wave 2b g+rkjrs*mml3cqw dj99 ;g2formed?

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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 Europb b9v p 4y9iask27sti,e with a Mach number of 1.05sp4sa 9iit, 2 y7b9vkb where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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