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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 m(/g 7fqjl;ubis 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 thru0.:6 pk 1xrrkrun 7u ,bz9awuough

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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 roduk z:z-59 jqalot z0wxs-+ct r), qyb1?

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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 inc/w wa: xp:ahx/reases, what happens to the velocity of sound? (Assume that /:xp/xawah : wall 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 Hz sw- 8xcl9/pqfn ;e5y-qfeq5 ua ound through aqf9 w5; -f/aqux5e lpqn8c-e yir 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 shy s )ij vv*b431u4khgt55iupound in air ikt554 huhv i *1b)ijy4uvs3gps

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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 grtbt+r(b;fc5u jrl27 qeater 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 fc rm;1fww d4+x zs(w8lrequency 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 waves uniformly in all directions. +um:w1q z -gmstir1 sjb35 tu+ If you move to a point twice as far away from the sourcsuw+mqs3t zm5bg1i1:u jr+- te, 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 is5;z1(f 5aihwocr0d v s 2wjyl7y07dt- o4bwj r 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 fromz)x-yta: a fbns 8l*7j the source is I. What is the intensity at a distance 2d )j-sa:anxty lbf8z7*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 soud*ah83 1bhx l7z mf u1;rl-rq)mw.. kucdd0horce that is radiating equally in all directiolhmcrd.)x07. -dqu8bhlha;ur z *odw fk 1m3 1ns. What happens to the 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 distancy6u4u 9w6yzcyw+/b py e from a sound source that is radiating equally in all directions. What happens to the intensity level of the4y/ +9wwu yuybyp6zc6 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 sound becomes lox 2 -ad t6sexzmw,9h:vuder?

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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 emi rqv,k wh bi ni5/nc1/)nlh(5btting a pure tone. What characteristic of the sound increnbr qkb(1n5nc /5h /wi,l ihv)ases?

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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 muysgg q4j/xsa a;g.la+k3+1wi 32 cgot sical 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 np-0722xqgp f gj ydm.mote?

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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 in*yuv80)62h*wrim ik5ni ;z ybyukee 0to 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 e )*y2:q)bdcbzl8rawent 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 sound wave generateery7f.,aywrs k 07zs6 d by the guitar as a result of th7zre sfy 0wskar,.y67is 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 il;f ,6)oxffsw s 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 lengtb/0 9 e,8xg m0 ;/cp8isrtuuj:vjs xyxh L. What are the wavelengths of the three lowest tones pr:cej08xpb urxit/vsu9 ;,0s x jg/y8moduced 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 ry9 +s,j5wfc7xw ,e(cqeao . zhesonate in an open pipe of length L is 200 Hz. Which one of the following frequencies will not resonate in the se,o9a5q.c eh x7,j +sw(yzfwc ame 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. Wqkwnks bxs*- :1- i-eahich statement is coaqs n-ei--1 sw k*xbk:rrect?

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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 w8kbnh68j 7ehclosed 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 are the wavelengths of the threegef7j m3/eg+ /meh 5 -j6au7p7vepksj lowest tones produced by thij7jep5uje+pgme/36f mkv 7 -e a/h7g ss 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 resonaq5a, j8p3-k+lexkjhfqbl uv 0 pj). 8lte in a closed pipe of length L is 200 Hz. Which of the fulv bk +q3hqjpx8 .jja,-kl50) ep8 flollowing 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 resona; pmr92vc; x(n2a hte*,tg fzating at its fundamental frequency. Which statement ize*cat2gn pr9v;;x,t fahm2( s 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. xw,n pgy* t7,36qrdlqomo *on)c2zu . Each speaker produces a tone with a frequency of 200 Hz on a day when the speed o,y),zoo tr7w2 *m.6q ndnulx q*oc3pgf 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 bea unou-of8r,kzn+:u pk(5f kl(ts, 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 and a particular beat frequency is rg4z7mgb24 bb imucs5ui8::wheard. What happens to the beat frequency if the frequency of one of the tomi4:m cgu:wg r7ub45zib2b s8nes 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 ex fcjh vqms1cweq.,//9plains

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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 h-x5e1i hz+zc ueard by the obs+5z i ehzux-c1erver 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 w cq,l.f9s (ev*kb8v rstationary observer. The frequency heard by the obse(c8sqfv9.br*,v kewl 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 decrease bi)xbvt ;io(xk2ka.3sxo ,z60espm/ m y a factor o 6oks xt0kp3a)obez/m(smxxi, i .;v2f:

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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/s.. 4x*q a0x;, ziqrgusi What is the air temperatures,xi0*r x q4zaq i.;ug?

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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 yw: q hhk0doeu )y7rz47pih;) 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 bat emits a shriek whostam19wimq l- 1rxry.4 dlwx s.4gu 6r1e echo reaches it 0.0250 s later. How lx-16 y4i.sm9.m4g 1wluwad1rx rq rt 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 tekr6cnv m/ag,:mperature 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 5.0qzj: 8te t8rnm,g0xz -)jdha2ou/6xx s after seeing a flash of lightning, the distance to the lqtu-d8) h:2 /aej,oz8m0n tj x6zxrgx ightning 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 clif pz/:s;ve(5fm;fcyk/ qlg 0k jf 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 hear the splash 2.5 s lateu7f ooa6j*q ahunp)f8(ijj(3 r. How deep is the well? (Ignore air resistance, and assume tj3i7ajhf 8((u 6oq*)n upjoafhe 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 vxhpe 2 67dxk-kitkd-*c(yos js +2p2of 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 atnq+a.endohr21 uw f t+9 s*0qlc qu-h *pg,3ru $23 \; ^{\circ}C$ 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 xm*pqa cpjl*)l c5(myqj 09(r3sxh 2gsound 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 intensity0.fs ) ld7b/lfzp *icr 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 intensitieseoa8 vu5ffcm5q9+,v g of two sounds with intensity levels of 70 dB and+vgafu , 58qo95evcmf 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 flrm(yzn ) 1 ggj(+0liin a garage is 100 dB. What is the intensity levelifm1)(gl+z jnr(lyg 0 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 souh642 l /sd6(jtqtyg pot0y(pe 4:ep cmrce that is radiating equally in all directih omts t(( 0p62gjqy 44/y6: pectepdlons 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 from a source that is radiating )mce3z-/pm- zb:e melequally in all directions: -pz/)blm -3ce zeemm 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 mWhqr4e ulwi:4( px+xu) of power, which is assumed to be uniformly distributed in all di:h +)4lr(p uix4eqxwurections. 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 65 dB at a distance 5.00 m from a b6u ;-5g0:pyfzea qpebq5 ;raa arking dog. What would be t:z-aqfry ae65 e 5qg;ap0up; bhe intensity 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 level m bf7ksyvs.7 l1 h9w2wis 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that.7 fk 97wsb ywshm1vl2 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 sou39;akum 0keymrce is 95 dB. At what distance will it be 75 d0um 9ek3; ykamB?

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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 Hz. What is the fr a,-69vrdutgoqq ;codcg k:1+equency of the fourth harmoni 9c q 1:ctd,daq;u-vo+6or kggc?

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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 1*thbis9e6 ja pipe is 900 Hz. What is the length of the p i*6hts19ab ejipe?

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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 resonav g1ssxm 42w0mcy,bv 1te in an open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipevmv10y g41,wm sbscx2 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 lengtr 0p6 a)0u ij-uo+8li /yivyich of 0.80 m. If the velocity of sound in ai rj8 ioyiiuiy/ 0cavl-)0u+p6r is 340 m/s, what is 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 the9 j9 n,dimn.cw 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 onrh uaui4w1,k*; f; q2wr+fm vpe end is 330 Hz. What is the frequency of the third u;wa u+hf12wf,vp;r4 i mkr*qharmonic?

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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 su 7cj m9gal2tq)k 8px) 1ln/oshortest pipe closed on one end that will have a fundamental frequency of 60 Hjstmk 7lq)u98gpxo)l1n /a 2cz on a 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 temperatmkzpr+ujlk9rpxq g 793y5k:0oyt6x69 k9q vi ure 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 whe,9 kal :vyqa (ia:fyg3uan1+ fre 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 ne8c kjoqp 6zj+.cp kpt+ n3/(the speed of sound in air is 340 m/s. What is the fundamental frpctn je/+qkc.+ oz3ppk8j( 6 nequency?

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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 fmxo8d, bspf- u;*v.qthe same length: one is open and the other is closed on one end. If the fundamentaq8sb-,m vfxoud f.p; *l frequency of 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 each emit a frnsq,+qfpbtb,)rg h(b+oii,y nc5b2 5equency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would sourcei(b g)5 q2qb ch ib+prb nsof,,5ytn,+ 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 s 5g*w06ud4xejwk yhj (ide 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 diskh6 0x y4gw(wjd*e5ujtance 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 444hx.h15x v sef.6ga1qr Hz. 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-H(. ux:a: qh.sfwc; p.ac4mj ofz tuning fork to tune the frequency of a musical instrument. If the tune .jxcms:f(.w a:c;qa o. 4hpfur hears a beat 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 produced by two horns are 6 m and 7 m respectidb.lr1 h;fah8 vely. What beat frequency is heard when the horns are sounded on a day when the velocity o.ah1r ; 8hbfldf 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 stringxh m pl*b.pk yi- 2wp0ycl55,cs on two violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 0w,ckl* mi-5.h5bpc p 2lxyp y660 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 stationaryp)+ iizrq. y*bfiv6id b:nj- ) k81iyh 1000-Hz sound source at twice the speed of sound. The observer hears a freb. j: y* 1r-b+vdf)ihikpniq6 zi)y i8quency 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*wz6( +wtxkvlh).z gz of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a frequency 6vw)h*zx t(gl.z+ kzw 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 30 twn)nu 5:h xq8m/s away from the source, what is the frequency heard by the observer? (The sound speed is 340 m: h85u)wn tnxq/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 trtlf,5y vuao mqi -f)+(j 1ef*baveling at 35 m/s on a day when the speed of sound through airqb l-uoavjef*y1 f(+ ,i5)mt f 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 obsei+x ,wdz5f2 6 vxwvuy6rver when a train approaches withdwy u +v5ix2fw6xz 6v, a speed of 30 m/s. The frequency of the train 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. Th)yhljqmz9py 9w9j7 :rq-x *qpe train blows its 400-Hz whistle. Take the speed of :lm) qryw99*jphq 9y7jp z-xqsound 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 train blows its 400mx-ak 9 zsbj (3voq./y-Hz whistle. Take the speed of sound to be 340 m/s. What frequen3ks.by vx-zq m/a(9 jocy 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 fqz1; ucqo0h d-exqf*o -m;ab4rom you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of soun mu;c* q;-4e qfao -qhz1xodb0d 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 aq aqt4giro0 (9way from you at 120 km/h. It blows its whistle, and you hear a q(i torga904 qtone 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 thb u xq036w(j;3gub dp 8;ibnhh;chmx9e 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 3h3x;bu m(9nbb0cig jx 6u;wh8dq;3hp 0.0 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. 5vj ci 65kzv(fAssume the speed of sound in air is 340 m/s. What is the frequency 6(fvzv 5 icj5kheard 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 a uihlqt18 xqv.p n54r2n object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the 2rh15qxl 8qn it4pu.v 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 isfr.us+;wj++t8r wsscdp d ; ; 40rbxky $60^{\circ}$. 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 p3-ez2v/ fm- emhtj* sthe half-angle of the conical shock wj/*- tz -ememfvs32h pave 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 ns/xx*ip66w t vumber oftwxv6 xsi/6 *p 1.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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