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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 imzl zu-3t t5 gqy8-1qwe3c d/rs 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 fastes ; +otrccvg13xt 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 bfgfig( 97d2y0od s.o7ktrw+in 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 the air increases, what happens to the velocity of sound?pvezp-,ene i7 u3s) e/gjgo2sa5s(5 d (Assup zpesd7, - gvj/nge 53(u2sie5o)seame 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, the velocity of aes09;ck*ejqle t)jw ; 200 Hz sound through aie9s e;ejqjt 0c);kwl*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*n filrq*w vfd *5 +nqzz+)z0h wavelength of a 200 Hz sound in air)q*fq+v +n*zd*r zzfl h5nw0 i 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 fryn w)kqd k+:,z viq0/gy;vp b2*(qmcqequencies 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 than 20 Hz are c sc:nv tapbz)i4xv.ic-m.: z 1alled

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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 diri- y15ds3)xlyyu 4hf fections. If you move tofu )1 lyh3di4fx-5 yys a point twice as far away from the source, the frequency of the sound will be

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  For spherically diverging waves, intensity is proportional to9ucnhfe 7.(leam/e*,a7 cmyo

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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 ycs 0tiv/a9q+2y*yjp0y pi cr3)cn8kat a distance d from the source is I. What is the intensityapv c9cyy)t/kn3*c2j0p si0i 8+ryyq 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 distanc;yc w ap7oo.i8e from a sound source that is radiating equally in all directions. What happens to the intensity of the sound? It r.po aco8i7 w;yeduces 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 frnd8+ v ld1-ovdom a sound source that is radiating equally in all directions. What happens to the inno18vdl-dv +dtensity 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 becf7 z -0bqty(saomes 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 emitr(*o8k xr mwv-.1 ewylting a pure tone. What characteristic of the y kw1.evr -x*w8orl(m 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 a mcg8:23wzm r ,oa;hlfni+ q(cxjn hr1.usical 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 nobt,o tzs+v9 i7te?

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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 watzyuo-ou)c qd+2-vb )qrrm* l9 er

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wavepjp1t9v1 i*u 7is: ilr0 u)11p u(moulsxam +is 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 w2a)hdv;:tr)h f7akg02ck 0ach s.yjtave generated by the guitar as a result of this vibrati.a 2a h cf: hrt2c)0g0j v;sk7kd)hytaon. 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 tbt/razmo*jx ,6/ x1xxp8 1 ewboth 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 thre 0( xddw9:myc hna.1wue lowest tones pro w(d0wdau.n hc:91 mxyduced 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 in an open pipe of length L is m86d jg;,jx m- n9 jsfo2z8wyu200 Hz. Which one of the following frequencies wis2;mo nj-8,ufdx8z9y gjjmw6 ll 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-k,8ko52kndeba 7;+eftl kpu .qsn ,n2+xwoi is resonating at its fundamental frequency. Which statement ixnn ++8osb oed,kkukf nak.2 -w ,e;5qtipl27s correct?

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a resonating pipe which is open at one e6gm.5zb5 ky uend 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 the rhuq4d sg24 -dthree lowest tones produced by thisdr-udq 2hg44s 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 agr1*ii5y ,l yof th5,*i1yailr yge following 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 r ow0t0k) h.spqesonating at its fundamental frequency. Whip0k .)oht0 wsqch statement 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 speakers driven by the same source. Eacx vp1m3p+hky:h speaker produces 3kvyx h+:1 ppma tone with a frequency of 200 Hz on a day when 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 sound waves shh)dzaux m0qt( .u 3d(v xwh,v9ould 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 togetz:*(pe:oqd yfddcd 1aok 37o4g8 c8 rdher and a particular beat frequency is heard. What happens to the beat for1pg8 qzc4:73odd ydd(d ec8 ka:*f orequency 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 explains w*ys,sg0kn/7blc+sm

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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 akru( 9/vffe e16edpwejc) c52 stationary observer. The frequency heard by the observer6f5/e2d cfevj (epk)9 e wu1cr 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 stationary observer. The frequency heard byjyf:c4g h5 t;iq6eck2 the observer isc f :tc6g2q4j;h 5ykie

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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 lyu1g)o.1 b sedouble its MACH-speed, its half-angle will decrease by a )yeg l1o.us1b factor 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 ultrasonic1u nqvx ;7142t awsh2 i xcecfah)8rn4 sound of frequency 45 kHz in air is 352 m/s. What is the air temperaturece q n8t47i1) srh fau4vxw anc;1h22x?

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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 soundloy43bbw9yw 1o ( sshn(e7i0 m 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 u .c2 cfnp3eyo h/czmb /2 *+qyc(,lf6 dvgh4remits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back theflc./(f2 uc4 6pdh hgcv,*n+z3bqer2/myoyc 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 ecp jje;8zte1 8cho in 4.00 s. The temperature is $0 \; ^{\circ}C$. How far away is the cliff?

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you hear thunder 5.0 s after seeing a flash of lightning, the -+p .*mt52l*u cm3xfsnc* ras3wyrdadistance to the lightning strike is auyx*s3c r m+rn5 **-t.mfd3aspl 2 wcabout

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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 t4hjum4 -wui8q+, ) wyv9 lkdwiemperature 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 lavde-o:u jice*f 92k4p ter. How deep is the well? (Ignore air resistance, and assume the velocity of sound is 34jvo:uipec24ed* -k f9 0 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 so6 t-gkyrtn sq1kpv;(0und wave 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 aipze8xhj, cm xj . (r k1ysiiw)l6(p/8rr 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 intensity pp-7u/x wqpq+ $10^{-3} \; W/m^{2}$?

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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-ry bl9an)ff)7w9es8 w 5r*dwllcqu/0-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 ovvpm7lvr95taa4 +q/89n. rcp*x6zafq (rlk with intensity levels of 70 dB and 40 dBl5+rvn*(ktfz9ppxa 8a6r4vl 9arm7.oq /cv q?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity level by 15 engines in a garage is 100 dB. What is the intensm1-,l gk-*.71i mxl pezvka quity level generategvk,ue 7lzp-m1 ilxa.1mk - *qd 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 source that is radiating equallhuqgsp9:;b1;3gh+afm ex*yq y in alsep3bqy 9xgfuq*h1;h: +; mgal 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 radiati1brcwj egs6(0b2a n :ta:,d/ 2 rvtqpqng equally in all directions bqtt: cqj:erar0p16s dvaw2(,2 ng/bis
$6.0 \times 10^{-10} \; W/m^{2}$. 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 (3h/r eviu s6ci qpa/+8. +f n1zi b+a*kofkmsmW of power, which is assumed to be uniformly distributed in all directions. What is the intensiam +s. ff+6+ er1 pis hcikvoqiu/(z8kab* 3/nty 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. What ww4ngsr k (v 1at.dmxa )9ej+;pould be the intensity level if two identical dogs very close to each other are barkingwx 91g4s (enk+d.j vap)arm;t ?

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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 mjgn ha:jx g*4c0e(ir 2+e0aic from a sound source the intensity level is 60 dB. What is the:e+jia c20j n0 xihcerg a4g(* intensity level (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 .1tqpb v:k.c(wf f +voa point source is 95 dB. At what distance will it ofvvpbq.k .1 tc+: fw(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 3 *c.;wd(clg,uwoicoHz. What is the frequency of the fourthog3wccl uc( io.,;d*w 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 9 k/5pwh5zt4ka 00 Hz. What is the length opa 5w kk4z/5htf 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 op c7+svvm;g nw7zc8 sn(en pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pip m gvw(;+7sccnv z87sne 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 ej**5wii- rtrboth ends has a length of 0.80 m. If the velocity of sound in air r r -tw5j*e*iiis 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 the tempv6bf9 qew o.i;erature 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. Whac-h2boqb24nh*dlf 6q t is the frequen * bqq22dlf b6ch4o-hncy 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 have77ar2oe4dub4v zv*zd a fundamental frequency of 60 Hz on a day when the velocita uv7ez z74vod4b*dr2y 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 innz*bz1; +x6moj 7whvk 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 a.s yv39 udu3 .yehew+m 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 ofc9/b(db(qpw w6 r*sx6zjzt z ; length 0.75 m is played when the speed of sound in air is 340 m/s. What is the fundadwb;cz/z6 sj(t r qw*xpb(z 96mental 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 length: one is open a l ze-lw(p0ms,nd the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of the clo-0,wzm s plel(sed 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 fr ypj(8z4+ afkrequency of 800 Hz in air where the velocity of sound is 340 m8+a yfp rj4kz(/s. How much farther 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 side byhszz.-b.3a bxff h- r; side and driven by the same frequency of 500 Hz. If the distfhx..-f3sa - hz; rbbzance 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 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 frequeo qybet 0-9ubuur meb5596/n zncies of 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 tun,spdls(-4 t(qflihk79 ) enljh 03iwme the frequency of a musical instrument. If the tuh-n7l0 (e49(hw3sltims)l,kj qfpid ner 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 resyujw(3a dqkd0(8 b *b70aurrpdy9y6fpectively. What beat frequencyuubqfa(y8 (6ddbk pr 07rj w9ayyd*03 is heard when the horns are sounded on a day when the velocity of sound is 340 m/s?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The corresponding violinvjfee)qs nn,h ui/3r 2p/ k(1i strings on two violins in an orchestra 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 t(eu v/k)shnfj1pq i,3/i ern2he 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 ses 0li wxw0;qowxzw8z -7d 0v8ound source at twice the speed of soun0z;8wow80e0 q-zvlix x7 dwswd. The observer hears 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 10vd 2)izswp),m)n(xet 00 Hz) approaches a stationary observer at one-half the speed of sound. The observ zvtmnps))e2wx ) (,ider hears 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. c-nxmzbn9-g(0cn q .s If a listener moves with a speed of 30 m/s away from the source, what is the frequency hea cs. 90xnnq-n c(gmz-brd by the observer? (The sound speed is 340 m/s.)

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A police car has an 800-Hz siren. It is ta7,kn3rgo zcbgllruf 27l0 .+ raveling at 35 m/s on a day when the speed of sound through air is 34cfl 0k2,b3zlr7l+g a7 n uorg.0 m/s. The car approaches and passes an observer who is standing along the roadside. What change of frequency does the observer hear?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the frequency heard by a stationary observer when a train approache ;.8r(n6+swu 6:twhnn(gorham azd 1es with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the se8wn1 t g.rmao(d a +usz(rh;n w:6n6hpeed 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 youw:p 1g10t9pu64x egis:trhxa at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequphg1t1p:9t ag x4w06ie:xr s uency 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 blurbp: 1r 79afpows its 400-Hz whir:u917 pbpaf rstle. 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 away from you at 120 kz:as: ap3 *qwx-dg x*km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequaqapxw *z d:: xs-kg*3ency 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 ft35u iw- xunb4rom you at 120 km/h. It blows its whistle, and you hear a tone of nibut w-u53x 4400 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 gpm5i t4s6.uris 340 m/s. What is the frequency hearsi5g m6.t r4upd 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. Assume the speed of sound in aira,x-nov 7d : -)vb0krpybrv0 g is 340 m/s. What is the freq v-p0 bb-vknxr7yo rv,a)d:0guency 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 sent dl nm:p5 5w .+xm, uvt8xoubh/out, and a 42-kHz signal is returned. Assume the speed :5mh5uwm vb8 utop/nx,d +l x.of sound is 345 m/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 wavf0zmfyk(3mr0 jsw1 thvi5-4 we produced by a supersonic aircraft is $60^{\circ}$. What is the Mach number of the aircraft?

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A jet flies at a speed of Mach 1:o lvj/fy )jmgq/f4 )a.4. What is the half-angle of the conical shock wave formedf 4a/yf)l/o:)qj gmvj?

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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.ej/lx:ktfsbx,6pk22 - rn si United States to Europe with a Mach number of 1.05 where the ar fxexbl s-6itj ,n/k.sp k:22ir temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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