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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 uqvkgz.dep* f6d*;4syac :m- 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 fasteus 2v22z drzo0st 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 sorxeg rgu13n:ak/57 mteel 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 incrb,u+6kj 5xcaplre :t7ihb2jyvs5 7; eeases, what happens to the velocity of sound? ke, pcy+ 52bxvj6 ait;7:jlsherb 5u7 (Assume that 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 of a 400 Hz sound, theai cu/,i;duc1 velocity of a 200 Hz sound through aicu; uia1dic/,r 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+ w)k+ ftu)dppzk, y6c 200 Hz sound in up),) kt+ypf6+zkdwc air 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 20,000 Hz ndk(ff 0wpq8/p:m4x oare 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 freq6p; z9bg. zdcquency 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 dirg. ,1,/fubjf-rflp.if5wun (s5 r dpkections. If you move to a point twice as far away from th ldbfj,/i(55gfk. fr.f, ur us pw-n1pe 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 w z9:ls n;c)94mp6*dikgw6yjjzf gjh0aves, intensity 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 dista:g+iz . aunrp. 5 h ai1a4u)(flg3jauknce d from the source is I. What is the intensity at a distance 2d from the source:in przu3 1.jf.5 uiughak+lag 4a(a )?

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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 k.l/0 bskhf 5aequally in all directions. What happens to the intenshbkl/50ks .fa ity 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 3v*jeldwsx/2 k*(uqw4t g;upqk;u3ffrom a sound source that is radiating equally in all directions. What happens to the intensity level of the sound?uq/(e3*f3tw; sv q2xw4uupgk*kd; j l 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 a (ore x,wfr03ts 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 e f) f2kggr0md+;4mrngakn b76ng;pk*mitting a pure tone. What characteristic of the sof rn)mn+ r*;k pk0fg g6;g d2na7kb4gmund 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 not9lbap 90t idk(e?

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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" oks;mlx1p7 i.b f 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 into watel47e-dr zh1xelh/ebx 9x- ) ulr

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wav1jq-li 3m kpexa,2u: kes 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 a34dqdt8qxv k; h5:ygj6get0 + jkhp 8pnd the sound wave generated by the guitar as a result of this vibrae :40 p8k+ktdhjp; xh 5q3jg8vydqg6 ttion. 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 is open at both en688zrci z4gul rn9k4kds, 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 5z:ov wqk +v6ftfp.l/ L. What are the wavelengths of the three lowest tones produced b/qok5zwtp vv6l ff.+: y 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 5vl7 uug3 hhof:p* xz12p uly9in an open pipe of length L is 200 Hz. Which one of the following972 uh3:uuy*o1lflz php5gv x 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 fce5ix/pa ogba0*/n+v1 h rc5 ;j rwj*erequency. Which statemenb1+xpjc5ge n //5rovjaw0;ie *cr ah*t 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 is opygtxmpt )x75.,nc)nnen 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 of thh(g tb 4 wr/e-uuuqxf2m6 9z9ze three lowest to(qbzr9fuu gz29u4mh-w/ x e6tnes 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 in a closed pipe of length L is 200 Hz. Which + qw (pkp2mjm4- )*gduxvi- tqof the following frequencies will not reu2pmg i)4dmtjw k*+-xv- qp q(sonate 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 resonating at its fundamental frequency.vc;, jn6 qw 4yyga7iq,r:pb +j Which sj ,pcg :6rby7+,qiwyj 4a; qnvtatement 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 spjg va /ci)90,z4ia+ouwrohq * eakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day g/jzh )ria+owv q,0i4uc*9o awhen 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 sou ahrtev+u4 (b xt37*vbnd 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 gl zzax04gg +az1i2g1heard. What happens to the beat frequency if ta2+i1g1x 0zza gg gl4zhe 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 exp2q8p x)k0frnl lains

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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 freq65li6y f2 og/ucmb65djgyhbg 2 :tcp2uency heard by the obsep2ic: 5glf6 uc5o6ymdthb2g26y/ gb jrver 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 statio u/6r /3ksi eswjcc+,pnary observer. The frequency heard by the obsepcus jrws 36c/i,/ ke+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 bcqr 473r6a/(0vtyin,12zkaub vg d ddouble its MACH-speed, its half-angle will decrease by a fa qd r3natk4urg7vb, yv 6a/d1i2bz(0c 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 fre0jdr i /pxax;2qk*,no quency 45 kHz in air is 352 m/s. What is trd,qx0/ik o xn;ajp2*he 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 0dmj+e6fasx,v7 itj* the 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 sound z9jzpfwx+/k: )sy57l)mu bnq in air is 340 m/s, a bat emits a shriek whose echo reach+z:ubfpw9ns7l/x)yqmz j 5k )es it 0.0250 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,4neqs627x0tt q5e o; ahl,x - 2kxpqto and hear 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 ser/qw,5;(kmqb n67k3m q 3zdz v6d( kobm zbki/eing a flash of lightning, the distance to the lig6dzmw( nvq5;33qmbm,6rzkk/ obqik/z7 bkd(htning 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 u z c ohp7v-kf1,pwv/w k+scdu)ll,.6 cliff 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 later. How dgt7en ; ml vk3o2,hclw)rd98veep is the well? (Ignore air resistance, and assume the velocity of sound is 340 mtlvw9327r8ho gel )vcn;d,k 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 wa,j +qfi/.u oprve of 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 a f *d:twg /o966gu gdaos,7qyvir 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 i-01d 55w rzggi)qgczof a sound 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-dBwi/4: vtdp 8 tf 8csf-bqx.t 1gccq4j( 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 inixm;8,fqijc 8h kso3tg;vl* 1tensities of two sounds with intensity levels of 70 dB and1 cxth;*g 8,jv s ;ifomi38lqk 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 12doll a o2qd m45yn:)x5 engines in a garage is 100 dB. What is the intensity level generated by one engine25 yd lx)n4m qaool:2d?

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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 rad7ps55wf5xsya yhr13v 7hp kz3iating equally in all directionss5a1h3pkxf r5v syzhw35y77p 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 equa bpli2.ozcqx.0ilt( 2lly in all dire pl tbcizi (2qol2..x0ctions 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 a 4) ht:8i 4tlzn4sbeydssumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 84ni:by4t4e lszh )dtm 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 ba 8wn -hb mie-17rt/ctno,c+cl.je zy+rking dog. What would be t njocybiet -e.c7+ nz8h+tm, r/c1-wlhe 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 souz7et a .r/ts-ond 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 t-areto7 / z.ssource 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 what fl7pvgno -7 s1distance will it be 75 dB?nsv-o1g 7flp7

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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 ; xv oac/7e oy8 i7qy)tp.c,hsthe frequency of the fourthih8cqey;ox asto,)pcy/ . v77 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 90;gtx ar jvfu je3let9598j vs:wm54y-0 Hz. What is the length of thgrte :uaf-w5 s9el48yj v9x5 mtjv;3je 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 jxx.g 19iskx.k x 5lnb0 q.coo xj5/2eis the frequency of the lowest tone that will resonate in an open pipe of len5g qj. ekx ix9x2n . cljxo51o0sxk/b.gth 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 thjy7) g6orydschtwh;c(g .( y+e velocity of sound in air is 340 d+t7c(g(goh.)sy6h jc yy;w rm/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 the temperature o n577 rj itjvn00.csq l5l)cpis $20 \; ^{\circ}C$. 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 frequencyip/ xr95r; bq4s yuy-o hc4x;lp/j5v z in a pipe closed at one end is 330 Hz. What is the frequeno sq4b/xrui -p55 y9vycxr z4l h/;j;pcy 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 will havkzo/i etat8spyto39gz7; a5.e a fundamental frequency of 60 Hz on a day when the velocity of sound is t7ag9opt k8/t oze 3aiy;5z.s 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 temperatur:c1 tl,xsx w:pw./ar a4us4hpe 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 wherer.7r ,2r(pmkbxt8hqja7:c rsg 1,()gbtj u nj 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 in air isbdgotjm)dt4 ;6ir 9t 7 340 m/s. What is the fundamental fr;7tto9mdj4 b6 igd r)tequency?

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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 le jmf86 r4b kf *+7aab.aqzr)gbngth: 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 fundamental frequency of th7 +fk a*jqrz mbg b4faa8).6rbe 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 c8b9sj55, kljxk oz:m.b4 xpi emit a 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 observerkblcx8xjo 5bm j.s:k4z,9ip 5 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 sidu:os -awfyi/be6)3kb e 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 distance from the person to the other speakow6/i 3- fa kb)useyb:er? (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. W(gx n4-gml; -r+ cwoebp,2ea uhat 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 tun6/q: dj/nky7 h e/ rofs1pjwr,fsuhof./g n++ e the frequency of a musical instrument. If the tunep/fus q7 jod1 :nrf+fy/+shegrok, / j 6w.n/hr 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 respectqad1;go-nmhw; vrw 1mbcydk h4f9-;9 ively. What beat frequency is heard when the horns are sounded on a day when the velocity of so- gwm99; bwv11y ;4-ocdnkhm;frdqahund 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 orchta akwof9jei8w 7 ;8.aestra 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 one of the strings would bring them to the same8oaf;ja 9 i8 7kwaw.te 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 cj).19jd9f:ny vbrym: 65n w8n uxoqssound source at twice the speed of sound. The observer he9n :u 8w)6dy1cxb9ojr n n:msy fjv5.qars a 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 (normal frequency of 1000 Hzczax24u m5.+fuq43c9au zdx t) approaches a stationary observer at one-half the speed of sound. The observer hears9u5cm4fuxaa u z2+c3xqt4.d z 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 30df 2(s-hezbh;gft3 5 q-cy) qnl(w 8wnmkwb11 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 34n t ( 5swn1c feb-2hbfwywh-d8g)kqm( zql;130 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 800ipf3)ryu3 yua 3zlo1*ca 8kbp/q0lt+-Hz 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 passes an observer who is standing along the roadside. What change of frequencyp8lp0cf)b3q *aru3a1 t 3/k ziolyu +y 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 gib 2s-k)nq7(xwuvz;/i+ sux observer when a train approaches with a speed of 30 m/s. The frequency of the ;qbu(+s w)uksnv gx xi/z72i -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 y kv1kd/lm59u+fue bb.wy;n f0ou at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you heamb9fwy; d0b /5+1f .ulkeknuv r?

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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 tryfm1u l m, fs.-.vqq tob3c38rain. The train blows its 400-Hz whis u oqy1mv-qrb,m.s.3lt8cff3 tle. Take 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 s )w4zae0 gxh,away from you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you he 4)zasegx,wh0 ar?

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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 fyem mm53 ,jzu45gylx: rom you at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency of the whistme :5 y5zg3,4mjyx lmule?

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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 5t6e )rluam )2m00 Hz. Assume the speed of sound in air is 340 m/s. Whatmrau l62em t)) 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 train horn is 500 Hz. Asfemqi2 dx58dgz-i b0+sume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is 2 zf+8gi5i-qexd0d b mapproaching 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 speu 8fllk*.fv:rjmb xq83 g6exm6x ;ewsu/nl3 (ed 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/s. How fa /x xxwu (e.lqlmjrsn;gmb:3u88 v*636 lkffest 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 byc ;6--jtdo*zqku r/l x 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. ymfi*qw+o+ +ry8-wbj What is the half-angle of the conical shock wave yf+m8y-+ borjw*+wiqformed?

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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 E p/b vxcfy5zaj2n 95yj9o+ f5xurope with a Mach number of 1/v9 jf p yof9 2xz5j55anbcxy+.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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