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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://autoconfig.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://autoconfig.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 false statement?v-qt l0w y2;+ til y;etp9hr83dv2hpp

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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 conduc/t:34kpv jtnp ted 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 steek3dqeke9jc1 b73qi ,vl 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, what happens p) n9s: ox3szjp2sz )fto the velocity of sound? (Assume that all other factors remans9pof)sz : xzp)js 23in 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 soun3 4tj,iu7 sh6r9qy nfid through i9,i4uq jtsh7yn3fr6 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 vvzzxzq-sp*- wxcc )yo48s )6 sound, the wavelength of a 200 Hz sound in air iqv) 8wcc-xyzs6 4ozsxz )*v-p 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 rb(e6 4u; n,igh4 jaeb3)fb ei *qm)urfrequencies 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 frequency less mee 23 4 ymna-2+xskrgthan 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 wamfml ; t,o,+hkves uniformly in all directions. If you move to a point twice as far away from the somot,+mfk ,;hl urce, 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, in zcc*jguikv i, a6n+*8tensity 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 ddeg ;;q25k9vq m5 vf6uw*irv yistance d from the source is I. What is the intensity at a dis ryk*gv6 ;;9um 5d vvei5q2wfqtance 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 yuak03irx.ml o pw78u8dh(;f; uuvn /radiating equally in all directions. What happens to the intensity of the sound8.u h8m ou7/ruw l d3y0ik(p u;f;naxv? 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 radiatifrg)3j) +mzek,8c t dbng equally in all directions. What happens to the infbj8)gcem rz+)td,3 k tensity 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 as a sound 60(z 7.wibwa1wf xezi 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. What characteristic ofu57mi2p prqoy b9orp/x+s.0 d f9boe4 the sound incrq9xf4dp2mu9 b/0r o+opsyor ip5.b e 7eases?

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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 au5(+5vqd.xob 0wx pru 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 mu f b )-enbzm)56 i866juwrpghtsical 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 fro.4px l g4zx0mlmbj 71lm 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 displacement waves areva ag h4h9*y2a

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider the standing wavwzp v: 7l:msn3zu6,l de on a guitar string and the sound wave generated by the guitar as a result of this vibration. What do these two wave:6 sl dup7z,vlw 3mzn:s 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 whi4k nhtm *4i7h9ktk2fn ln1zwl8zx2i:ch 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 p- na9/r0eyjojde :c7lowest tones producej d re:j/pe7-0yco9 nad 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 resonate c gdiq7b2j,- sin an open pipe of length L is 200 Hz. Which one of the following frequencies b-,qgj27ic ds 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. Whi3 (dn y+qha*xjqdi) fma3+7fb 2fqgc/ch statemmnyc fh)b3d7*j2if q3fdg+x q/+qaa( ent 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 iv cedhve o, 92f26*be g-:nugrs open at 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 oz n,;)(l oq/oztt w5uhf length L. What are the wavelengths of the three lowest tonesz );n (tlqwh,5u/ot oz produced 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 ce kduzqf :)z5;wj q()cvkb(, in a closed pipe of length L is 200 Hz. Which of the following frequencies wiljz(beu(q;f,)vzdqcc w)k: k5 l 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 closekjxu dx 9e33,+vhg0: l1ts uerd at one end is resonating at its fundamental frequency. Which statement is e+j9du03v1,uek tx gxr3l:h 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 s 8.xlkv+ q 9ex9fml/w2b+fjvyame source. Each speaker produces a tone with a frequency of 200 Hz on a day when t/ l+bxfj 8mfkv yq9w.x29 +vlehe 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 .vlwyc j ti0ii,o;b0ik d+p73sound 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 togethedf j231zn* z.q7pvuukr and a particular beat frequency is heard. What happ.uz2jdkunvq 1 fp37z*ens 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 expb3ect b-+ 3x)m/tlyiqlains

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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. Theuq ;o yuroi:s3pxwgo9h)x k6vm3* 6t5 frequency heard by the observeo *3v o:og;6r5xym9s6iu)3h wk tpuxqr 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 stationaryfn1 ,m*n1v neeti4ix2h 6) ddx observer. The frequency heard by the observf1 mi dx n)dxhnt1v24ne*6i,eer 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 b7 sp7v/f99mv.xysg p4l rvv: fy a factor7s.:4 pmvgv9xrsff9 v7/p v yl 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 mx8n;3 i nmaat:weh0d(m4)n/rpi m d6z/s. What is the air temperatu8p0thnaim 3xamnmd(w6;e ) d4r :z/inre?

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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 sozd pp4xn 5-cg(p.*fa cktwn1* und 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 son80b.1fzwmh xif+z ;d5x v gh5und in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back tzhm;hxi 5fb.x5fdvn+w 08g z1 he 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 (etm-c o54 ydzs. 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 aftesru:y es7: 3f7;vjxvgr seeing a flash of lightning, the distance to the lightn7:x7 ev:sfvsjru; 3 yging 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 05,a* tgmqf 2jo;p-iy kyg,p qg *p/zzthe 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 splam1.rwv 78tthh sh 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sound is8hvmt1 wh7 .tr 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 frequency 500 p hg27/z so0ty0wvpb8Hz 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 mux pa4.le r9(d)hwfx)h .sq1$23 \; ^{\circ}C$ 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 intensitc yssy4+dg,,b/j.i jsy $10^{-3} \; W/m^{2}$?

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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 7: w2drfuo(c ls-.vo ki v;t1j40-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 intensitieh;ehfcq s5 9z:s of two sounds with intensity levels of 70 dB and 40 de5z: 9hq fshc;B?

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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 1r xc:,dr/, i -my)qkvaus/u /f5 engines in a garage is 100 dB. What is the intensity level generated by one e/,r,:squ m kciuxy-//fda vr)ngine?

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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 sovsw3fotl,r(u22 1v7uu wztz )urce that is radiating equally in alwo1u(stu7) l,2r3zz vt wv2ful 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 6.0 m from a source that is radiatin,2ffy riaungx8/0 z2k6f* vpf.)var vg equally in r.izkf*82 npv f2y,aa)r xgu vff60v/ all 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 mW5md -ses) 9shu of power, which is assumed to be uniformly distributed in all directions. What is s s)mds9heu-5the 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 fro ,mf t ybi.lh720ms vlt7bg5* bhgwrc)qv)f7 8m a barking dog. What would be the irtbg2 .*tfmhml v77bqb8h7l) w i,g5 fv)cy0sntensity 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 o9.bu52m )vrh r,ayhlm from a sound source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the sour.hvh) omyr5 2ru9 b,alce? 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 whax:2w-y:deuqikctpfx0 ;k dtz:v 1r+ 3d7.xrft distance will ip:7.1:w0yf3kxcrtdvf+ :zi d dq ;rxxt uk2-et 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 cf t ,1yva:t;htnrg4u2omplex tone has a frequency of 1200 Hz. What is the frequency of the fourth harmony;rv, thugat 21:t4nfic?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of the1p. osmei,t ,y third harmonic of an open pipe is 900 Hz. What is the length of thoei p1.sm,yt,e 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 oh51x t) p8vtaqpen pipe of length L is 400 Hz. What is the frequency of the lowest 18tq)hxpatv5 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 le:fe.l12gv hp,0bnoc6ob yy *gngth of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second har g.lo yn,peb2fcvo01 6y*: ghbmonic?

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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 w:jb9xx5 4h m:rb8e2+asi,ld+g med qlhere 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 endargg al) h);*hgu4c2 d/90d rht2qjxj is 330 Hz. What is the frequency of the thi9h0jtar)c r2 4* x/gha;dh lgq gud2)jrd 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 th zp4-*k3vd/pydw :f5w cw 38.lktik+gkj qe*w at will have a fundamental frequency of 60 Hz on a day when thej+k.dfvpk* 4g 8-q5 ezy:lwtwck /ipwk* wd3 3 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 istmi 534vqo mn9 in a room 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 (qy26mff gc/fa 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 l mo3;zz6f 3mosength 0.75 m is played when the speed of sound in air is 340 m/s. What is the fundamental frequemo mz f;33z6soncy?

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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 onuv6f7 nh4ggd:s--w0jl y8 mrh one end. Ivm4 -lh rn0g u 7:syjfd-6wg8hf the fundamental 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 *+ uvfv*+z 8qiaq,u:ah )sqp ta frequency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in front of the sources would hear no sqai *ftv,au+:+p qhuvq 8z*) 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, s1:ey4hqj zl 9u+too ik:y0r 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 distance from the person to the other speaker? (The sound splu1,qzj+e0ioosrtyk:9 4 :yh eed 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 kaw:0;d:vw8 d*c ogvfis 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 fork to tune the frequency of: ;6h7u 5n:v h.6rq ex lw3xbwwb6evtz a musical instrument. If the tuner hears a beat frequency of 2 Hz, nh36 e:67 bhle;rv5zt: qxx w.wwvub6what 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 respective8u3qt 5xw srk2 /dm a51hbylb;ly. What beat frequency is heard when the horns are sounded on a day when the velocitw5; b3u8r1k mdasl5 /tybqxh2y 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 i0v -w/stdctbj9 su;0i, yqh0produce 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 s0s t-0cs/0bq jhu,vw i;iyt9dame 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 lo1e6/xt rk.w-Hz sound source at twice the speed of sound. The observer hears a frequenc rk./6ot1 exwly 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) apf;i j a/ l0fq8: dkec kh(w)embx:sc6:proaches a stationary observer at one-half the speed of sound. The observer hearl( )qfs:ec8di6 f:e;0 x/m: khjbwakcs 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 mo; p3nm:c*vzoe qn/k1aves with a speed of 30 m/s away from the source, what is the frequency heard by the observerkc:/o1;en q vn*3zpma ? (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 traveiss- kh;gqm7vo03 r( wling 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 roadside. What change of f-ik(wh qg3 mo0sr v7;srequency 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 obserpcglg-3zl d7+2wvm 6b ver when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sounpbz37mvglwl d2+6 c- gd 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 120hzs7yd 8;vv ze,x 6xp- km/h. The train blows its 400-Hz whistle. Take 6se8x h z,vv7p ;zyd-xthe 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 statiov2*j8 e - a,:pdkejlzmnary train. The train blows its 400-Hz whistle. Take the speed of sound to be 34k*pvl 8ea:2, -ejzm jd0 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 120j bo zri0,t v51u*)qxmaez mx5u5ax7 6 km/h. The train blows its 400-Hz whistqi7xo v j10,5a mexbx5)au5t z*mz6rule. Take the speed 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 7*s ojhjfp,v,away from you at 120 km/h. It blows its whistle, and you hear vs7j ,oph,fj* a tone 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 speed of sound in air isl/m iv *62jxrthk *bv:40*- jjl uldct 340 m/s. What is the frequency heard by an observer if the obsr* 6ht2xkdi*vt-jbc0l:m/ lu*ljjv 4 erver 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 speed of soue7v9zvffr(,dc cxut.ql0*0w nd in air is 340 m/s. What is the frequency heard z0fqlu(,7 f. xctcv*edwv9r0 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 spyx -uls 0opww:wjmf3 m-4;jn7eed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/wpj;3nm-04yf jlm :7 - wouwxss. 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 ur x dvg+:22xnqwyjadu+1 8zi 5o8; kiby 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 thrtn7-*6t*ab 2 oonpsz .934pd lfxu wte half-angle of the conical shock wave z p3utl*xp.ona*9 rbd27ot6ft4- wns 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 United8b y(y *wa3kr7wwy-+a*zfnmi States to Europe with a Mach number of 1.05 where the air temper7 ky*+w nfmai-(yrwzy 8b* 3waature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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