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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://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://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 following isnwg -7u q :dzn:-pi*ag 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 cond8rml(lzsx,w:elhs(ttd5u4 fk3f+m 4 ucted 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 inc8+ni:oo*c0 fm 6wqn o 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 thls1cjn +.f 9zzp6ge2re air increases, what happens to the velocity of sound? (Assume that all other factors remain coc9 .rs2lpzj ne1g+6f znstant.)

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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 sio zx4p(b2 .lq8m u7pvelocity of a 200 Hz sound through ai7qisl p2 uo zmxpb(4.8r 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 4uufjz:46id9pokr: u 700 Hz sound, the wavelength of a 200 Hz sound in ai4rokz f:duuu7jp6 : 9ir is

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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 20,00k)x. s0v:oa80qhjd u h0 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 :.uu.ee4vcw f9sztt,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(be *.vh umutt v sj-e+z*:0i4 nibys3 in all directions. If you move to a point twice as far away from the source, the frequency of the sound will be:3 u isv4me*.e+vi -b0tb uz(hny *stj

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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 is proportional tokj,t-in,jwv5v))l c vjgn3 k0

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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 sou x1f )4rz yqqacs09kt3rce is I. What is the r9q 4ftqzsx0ca y 1)3kintensity at 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 ;hlyuc *b,ly3t31rwo*y kg4ytf y3- wthat is radiating equally in all directions. What happens to the intent ,3 b-fyhyy 3gc*wwtl uy31*ryo4l ;ksity 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 rh6srk4 cwrd4mf7d2d.p nt42cadiating equally in all directions. What happens to the intensity leve prd 2d6tkrs 247h.nmfdc wc44l 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 ft, 55j0dgzoylm+:q rkf* pw- increases 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 emitt g x dqbth,e69iy1:q n) 9vxzk,aq:8xping a pure tone. What characteristic of thek ,g: n6qbi d9extqy8xa x,)9q1z :pvh 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 "loudness" of ab* *t:qobevv21t;m xn 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 "p,s6r2 k.0o2yo c hp)iqh 9qttjitch" 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 e)nzz 6tia7 e4air 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 displacemenerpd z:gu65gk 9y2 lh,t 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 wavewp.y q9)uv*h 8glg6f e generated by the guitar as a result of this vibration. What do thg8y. v ul*pw)h6 qge9fese 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 ends, thereeb)gybzv9xvb6w wy(i o2:46 o

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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 ltv 8jm 3o6uvq0ength L. What are the wavelengths of the three lowest tones producvjq6m3tv 8u0o ed 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 resonra zu8sz p,ywb w *.*vqj6sw;4-f;ivnate in an open pipe of length L is 200 Hz. Which one of the following frequencies will wqz.bn6apyvv ; 4j -sw8;uw*f*is ,rz 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(my h n6hhh1aaqg:h; ( its fundamental frequency. Which statement is correy(hha1agh; q6 (h m:hnct?

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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 -vw(nx 4 .h;tv(bf hjvwhich is 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 of length L. What are the wavelengths: f: *hbh hll,h +oa(v0takyz) of the three lowest tones produc hztlakah,(:h:l0 o b yv*+hf)ed 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 Hz. fw1.coo*n egz* vd99wkq5 .xn Which of the following frequencies 9zw5 e.9fn v*qx cwdk.o*go1nwill 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 resons51y rgetifoih- c7 .;5 lldhm7 jz)1bating at its fundamental frequency. Which stagc mslyzeo drtl51) ih.b7i fh71j5-;tement is 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 sp, fxz8:lbu d8ieakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 8f xd,zul:i b8m/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 have xme2fj:ch43 u

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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 an0cu2u1hh q c*gws/ wejvd x25(d a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones is increhvw(xqu52de g2 wu/hccj * 0s1ased?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift explep tgxq p3y:/jp.ia:* ains

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approachesdham6 f2y. ix7h y9/pk a stationary observer. The frequency heard by the observpmhk/idhya7.y2f x 69 er 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 stationam)fx* ih: ( e:bi7ehwgry observer. The frequency heard by the obse(ebhihwe:m* i f ):7xgrver 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 decrqk 2kf5n/l7m-qblzz ,pbi-rnd( / o1pease by a far,qfiknlm7p b bz-loqn2(d /k-1pz/5 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 b,nzlui,jk 5;of frequency 45 kHz in air is 352 m/s. What is ij, b n;zl5,ukthe air temperature?

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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 soun)*diuozer bg(-ncm5evd54q1 d 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 34fvej7ra ki l-k8+xrnf32 , ic50 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back the so n2celk,f8 - iki73vxfrr5 j+aund?

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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 tempe,cfh63 rv:iap1gts8 av cun-6 rature 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 fla. 5hq :t jr ntalhka7-b5vk+n/sh of lightning, the distance to the ligb7n hr5/: t5lh.knt- jvaa+kqhtning 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 1rc*12 ,:ldeq/ wy ux jvpb,qqosomz-2du3u)$15 \; ^{\circ}C$. 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 latem ainth125tg55 mtq:6 *jdbotr. How deep is the well? (Ign 1got 5 n*h:d5m6jt2m5itqbtaore 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 of frequencsch yea.w251y5lr6 fbyn9o; py 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 aae i 10e.nwo: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 inclnh7-7 + t3f 9 ro/bijlrmjh*fup,c1tensity $10^{-3} \; W/m^{2}$?

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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 70a+ *4.2ggb hbdk tij7a-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 inte9nu b blvox ls3a a:4cnd)3hf iy:3f;.nsity levels of 70 dB ida 39s b o3uc43ba:n;h:llnvx f .)fyand 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 en bdtm5.*0xfj m(g ba 5ci/cj6:j rl6hygines in a garage is 100 dB. What is the intensity level generated by one engine?jf 5jhtbim0ca(l 5 rbgxm:/6cy*d .6j

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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 nlvw7zf,d4/o5pj 2uj 6.0 m from a source that is radiating equally in allolwnu7p/vf,j d j25z 4 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 radia0s; l6by*kt gwe0 ,pc,ggzl2u ting equally in all directigl2s ,6te00g*;,zyku wg clbpons 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 uniformlgvfd 3))1y -gnlfg +q-wu2vuo y distribnggv2o )fufd1w ) 3--+ygvlquuted in all 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 65 dB at a distance 5.00 m from a barking dog*z.ywv.kl/l1 .itd0 *pxh inar5a2yo. What would be the i/.*0kplw aor iizydvyn1.xh.25*tla ntensity 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 oox 7wpo. -oxs cy5qz:k;5vp*source the intensity level is 60 dB. What is the intensity levx o o7o5.ko:p-yq*c5sxzwv ;pel (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 si/,f8h-h3zb) damqurm 1 o9x.0kaddwhat distance au- ,hmmad 9/db.)3is0dh8fz1 kqx rowill it 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 of 1200 Hz. Woilsay.j;c9m 4sc7r 5hat is the frequency of ;5yc. csoirmj7l a49sthe 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 t3vzaos5j0mfxw,1 (m jhird harmonic of an open pipe is 900 Hz. What is the lengtsjm15x ,3v0(z fwmjoah 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 ida+q e+8v(ruo6o 0ptfs 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of le08q (eoo++rpa6t vfdungth 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 velocity of spa 9 ,znwsoyle o)9ql:x)z. at2qp6*gound in air is 340 m/s, what is the frequency ,xnt*)9 9l) gyzel2a:6qq szpawo . poof 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 the tem 07o4ega5 xwuiperature 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 is the fr 3s)sowj8hh t*equenohj)w *8ths s3cy 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+wf-jkwwv i:h( --l ea one end that will have a fundamental frequency of-l ea-f jiv-hk +www(: 60 Hz 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 te8q8s mpa771fqnjwfrrkt8 48 ymperature 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 temperat9 axw.;vq: qexure 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 t.j 6nvi;qvxy+kid r4*. l+cxmhe speed of sound in air is 340 m/s. What is the fundc.+iv4v;*jxm .+knyqdri l6 xamental 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 l1kiq:u mky1 5p /l*r7-rbfjti ength: 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 fundkfiljr:mtk1buyr7i/1p 5-* qamental 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 frequency of 800 Hz in air wh4q oom;q2 3utwere the velocity of sound is 340 m/s. How much fart t23ow uq4mo;qher 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 sides ev-b uh34,dv 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 d3 e4hdv,b-u svistance 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 of89z 6mecjqjl f 7+b(ykyl lt2: 440 Hz and 444 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-Hz tuning fork to tune the frequency of u ks oz0q1dck ip22)0x q3yb)ha musical instrument. If the tu3squyz o2)bxp1hk )c0d0q2 ikner 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 muwn xmu/ m-jg/nrh. d+e5b5.t: gr/av respectively. What beat frequency is heard when the horns are s.5wr:ajb.mmv /n nu/eht /x-r5 dg+gu ounded 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 8:rd. t.gers1vh)rm 4yfex h5strings on two violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency oftfy8 h vrsxr1:.rgd4m5 )ee h. 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 stationary 1000-Hz souu/cfkl2 cnuy-x )40so nd source at twice the speed of sound. The observer hears a freque2unf0c 4)su/k xylc-o ncy 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) approach /;l3ub vp.b9bs*maxt es a stationary observer at one-half the speed of sound. The observer bm .b 3x*;s/vlt b9auphears 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 wiv12 ) el ;tjj0f9mfowfth a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound spej20jv)f;1 f9mtlw oef ed 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 tbkbif6 k 79s2hn*ps5ng at 35 m/s on a day when the speed of sound ts7nb52stbkh 6i*kp9 fhrough 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 stationar 9 b tv2ni6,ruqpa)w)hy observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of2v9r w,i)tph )a6 buqn 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 traiz6k)jtr b 2a9 g5vp.;,sscb1n6 capvmn blows its 400-Hz whistle. Take the spm6pk sa6v,;c1apnj 5 c.st9vz2 rgb)beed 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 trnvvz7k+/dklwvoa2p rfd)9hl w6u 7 86ain blows its 400-Hz whistle. Takea k7hn f6+vvu)27prw /w8dkol6 vz9dl the 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 youi ry0g z(-35cfv r,euw at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frevc0 3fu5yzrrwg- i(,equency 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 y 2g/fl0v *qc6fc y mt08zrkc*gou at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the 6 rfk*f c m*yg/lcgt0vz08 cq2speed 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 a4 :zkq .or -ycpo-bz.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 moving away from the train with ko:4obap-r-.zqzc.y 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 spe rul1qs qy3-f3,0lrc eed of sound in air is 340 m/s. Whafq3ue3yl r,sqc 0 1lr-t 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 signal is szfj x t9)ed6ocauha )z+u*--hent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/u6at- )9+oj uhx-h)zczd afe*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 by an-b;m n c0(fc0 ibie44lr-ewx 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 1qrr -xskfz( 13 nunm74.4. What is the half-angle of the conical shock wave formed13xufz4srn-m(r k q 7n?

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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 iam 6r ki4e9uw1/gz:z from the United States to Europe with a Mach number of 1.05 where thez 1 i/9:z46wrukgemai air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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