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习题练习:Physics Unit12: Sound



 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 is a fi-mr vjrx-; s4sagnjw,c. f)6alse 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 conductbzh 4:a;0uf,ivp rfg1ed 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 steel roo k: 6z)fdzfe1d?

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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 sz v3 ,2.nea :4ykxt3ietsbe j.ound? (Assume that all other factors remain const etyie3s:z. bajk.t,x2 nev3 4ant.)

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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 souna3vxz: wq68xmngm. ,0dm2c +bahe l x)d, the velocity of a 200 Hz sound througmb.3, g+v:x n halz)2mea6c8 xd0q mwxh 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 sound, the wavelength of a 200 Hz qfg1qwi(cw z)6w ;q* usound in*qf( zi 61 ;uwqwwqg)c 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 greate1dmax4 sw v.qun.j5k 3r 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 ad0q *x71tb2 sv e1q4:ii bqdbzre 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 u-s04v09lfdm nuf9n6lm/iv ;g fi wki*niformly in all directions. If you move to a point twice as far away fromi0lvk9*ws-vdfi i fm l/nf90n 4mug ;6 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, vlyqy(ok8* )cg*c,ft+7dc rw 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 wh n rxpn(fd8,ht:p:2/wgu u2at a distance d from the source is I. What is the ig p:p(8nrw,2n/fx d: t2 wuhhuntensity 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 that is radiating equally ib 3* fednin,y/n all directions. What happens to the intensity of the soun/bn*fyd,in 3e d? 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,aqv n;sad8 i5z6my 2q a sound source that is radiating equally in all directions. What happens to the intensity level of zy 2qaa m;vd,8inqs65 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 becomes bq .ibq(i18ym 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 charac.bu 1sp(xn wj)teristic of the sound increases?jpx nw(b.1)u s

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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 no( lmiz.c0x44ylwb6x bv *rl 0wte?

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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 musicahfro q gm7i 52v8m5;dgl 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 ip yz:sccm;op7 k0 4;ugnto water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displac fn0mpi 8vf+pvq, *ajo s(c2x7ement waves are

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider the standing wave on a guitar string and the sound wave qniwb5x*r nl0bkmt9/ f,,k3rgenerated by the guitar as a result of this vibration. What do these two waves have 9t,k mr3 /wnnfk b,qrib*5lx0in 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, gr/ fis5fq-tvnudhng21 e go/4 )e*(vthere

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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 thez3g1rgfqe h*)b(d9xg wavelengths of the three lowest tones proh1xzgr9q)3d eg*(fbg duced 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-9g4m wo/pnrje: g2r y an open pipe of length L is 200 Hz. Which one of the following frequencies will nrye gw-jo4np/r m9:2got 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 -a xgt9w7 5efyxg-,ar resonating at its fundamental frequency. Which statemenyfgxw rx-a7e95 -gta, 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 opio7 3w:jy-knsej) ,8kpmvno /en 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 the trnf900plo cjn( nj3xilkm; 8 )hree lowesti0)jo f( kml 0nn p;9c8xrjnl3 tones 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 of t.pmc6zy4 9 xq)ig -jcuhe following frequzgcp-. uym 4cxq) 6ji9encies 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.); e-av dbqy6s3 c-upcbmf4r resonating at its fundamental frequency. Which statement is correyc 4qfebm-bc;-p dua. r36s)vct?

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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, aaqb3c(0 l8k fha-0 u-chloj source. Each speaker produces a tone with a frequencyhhc a 3q0lafl(-bka, j8c-0uo 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 wav3qf5.mdvpfz s: rky1xyf:(a) xk)v3mes 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 an:ov0 av m mpdct)p4.fe/ q1)jzd a particular beat frequency is heard. What happens to the beat frequencp)mvamqvft4zcped. 01) j/:oy 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 explai0 ,7 d )wpcmkt6bhm29d erem8hns

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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 df9zn;deyu) oe. n;4ww.eqx) u z *z1vobserver. The frequency heard by the observer u)* q.nf .we ;uov4dxyzz e ;9w1)zednis

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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 fhsg +f:vaj,0nscc 2q8requency heard by the ob 8f, sv+qgs:cjh2 nac0server 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 decre:te9h t8x v-2z j uz5x(uquv3iase by a factoruqx5uz vzi:t-utj (3v9e8x2 h 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 ultrasn9r 7*l*6nvox/iktuqm )c p), u qk)wvonic sound of frequency 45 kHz in air is 352 m/s. What is tu *xro9)kvp7 v,)n*) 6qtkin/lm quwche 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 soubl; :8m,sk/ nh 2lwxq jkp+ /3krmz6icnd 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 ofhc 9) p3-plc*jdkm j:a sound in air is 340 m/s, a bat emits a shriek whose echj a: p9d*)3cchp-m kjlo reaches 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, and hear the echo in 4.00 s. The temp d)dr 4: x/r,obwtf vyl .n2p,ziqqj/:erature 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 seeingtoyl 0oi/agl7:b *f5c a flash of lightning, the distance to the lightni l7bi0 5 gfl:coto/ya*ng 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 clifk unymhw7( : l1( 3lden,qiq/)bow3eqf 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 deep ixpnge v jod02kke. :52s the well? (Ignore airn2ego5 kpxdv.je:k2 0 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 frequelbu4:tx0je3x wry .p:ncy 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 wmj,qs;j.,jm ir 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 solc6i-yu taq6 ,und 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-t 0 65mmk5xbtqdB 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 o( 2+ f4eo9dnh9x czklsf two sounds with intensity levels of 70 dB annk h(o9e zfd4s l+c29xd 40 dB?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity level by 15 engines inda 72pl g8:fuw(ir4p/5(m zjcs g -gup a garage is 100 dB. What is the intensity levdszgg(fp jgcm(il:a2 -pr 875u/wu 4pel generated by one engine?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity at a disa ck:a7quh ymq5hr n3mph*by)j;40 d+mkp/*z tance of 6.0 m from a source that is radiating equally in a 4 jh7qk;mr*k:dqn5+h /zy pamm)buc3ap* y0hll 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 sou 312j8c rq3xr0uk( bl r;vuwxqrce that is radiating equally in all dicvrr(q12b 3k3u0;r8qw jx xu lrections 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, whikd8)* hf6utgi ch is assumed to be uniformly distributed in all directions. ) g*8kidf hu6t 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 52x e( rvql 6xers684im.00 m from a barking dog. What would be the in l(erx q6r4vx2 eism68tensity level if two identical dogs very close to each other are barking?

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At a distance of 15 m from a sound source the intensity level is 60 dB. What ivuwlrh1.bck 1y+ q;43j fa: fis the intensity level (in dB) at a point 2.0 m from the source? +vq a .13wc f1rlk4uhby;ijf: 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 what distanc5nb1. b1lcpcb4l vr7)kj l (e;yxdwa2 e willwn) .; 2j4b5eb7lcdv 1yxarpl b1l c(k 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 to8p 5 yph)dkvau q.y:w1ne has a frequency of 1200 Hz. What is the frequency of the qup.815h) k:wpyvy a dfourth 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,us yxchatty8;r l 655 an open pipe is 900 Hz. What is the length of the pi ; 8yc5ta h5r6,uxysltpe?

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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. Whpe s6 f1(vn- bv)n;gvwi+ gw-gat is the frequency of the lowest tone that wpv)(ngn--ww gsf +ei;1 6vgvbill 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 leng/p10,s4kbrb t xovu e*th of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second harmonic?eb0kxos,*b4pr/t u v1

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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 th7y3 g 1gvkw0uhhq s/t+e 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 end is 330 Hz. Whfu)oginw)f-0fcdx lhw8j , .:at is the freqgo)fudjn:0fx-) fh, .i8wl cw uency 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 have a funday -algupo8+,kmental frequency of 60 Hz on a day when the velocity of sound is 340 m-k uao,p8 +lgy/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 t(:s lj l1cqj0xrhzi; i qw*n:1he 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 ihnl57yq,)y7ak st bx(z7yr: n3w)sj wn a 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 length 0.75 m is played when the speed of sound in air murr4vw* w p0(nkcej( +*,fql is 340 m/s. What is the fundamental *p*+mw(f, vqewncjk(r40ulr 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 and the ot7 pny8zl4(bxqtby:; oher is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundame bp(lyotz4bq7:8n;yxntal 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 where thwi,kp)*7.ovfu dl -hze 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 hearfdu) l7vhkwpo* -z,.i 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 side and driven by the same v *nj4xx 7 ihsjx8j,ouc 4e2*qfrequency 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 fromxu,qjjovsx474c8i*x j *2hn e the person to the other speaker? (The sound speed is 340 m/s.)

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two tunes have frequencies of 440 Hz and 444 Hz. qndf0 z;--)v qeb,+p,f qygks 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 frequeq 9j (nywbs)dl( hh2c-ncy of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of th9y-j q sh)d (blhwcn(2e 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 j*u05j w.19nl j3 mlb 5vqktyiby two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity o5 ilyt *1j3 l9q ukvjwbn05.mjf 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 +0z- lhkohugx-5y k : z2ak4reviolins in an orchestra are found to produce a b:a-5uz yh z4o+k-xlegrkh 2k 0eat 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 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 sound sourc:t /myxzj5 x,u-/ouhfe at twice the speed of sound. The observer hears a z:j-/fx uhmxu/5to ,yfrequency 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 100./wfp31h p xbz0 Hz) approaches a stationary observer at one-half the speed of sozhxw bp1.3 f/pund. The observer 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 100o 9ulb/bru5n2 z*zo3jk0v p7d0 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency hb5p z 3n7d*oj9uzkv/lr02 uboeard 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 traveling at 35 m/s on a day wh .ohz/51c gut66gpy+ v1ilo gven the speed of sound ggviv6t hu .6/zg cl +15oo1pythrough 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 h wdib,eek3koa+ cph- 8 xw;*j3++sovjeard by a stationary observer when a train approaches with a speed of 30 m/s. The frequenx+bd ;-,wipc8ee*k+js k3ja3woov h+ cy of the train horn is 600 Hz and the speed of sound is 340 m/s.

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling toward you h3 x1 qvwdqyj 2;3c9/r1igz xcqqg(k: at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. qzgwr1 ciq/;jk qdyqgc2v1( xh9:x33What 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 t o*dh8u(o 7szvrain blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear?svdo(7ou h 8z*

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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 km/h. The train blc a) y58vol3wcd5gl,o -q1xd tz9mtv0 ows its 400-Hz whistle. Take the speed of sound to be 340 yl ,9d5v8 clw0vtxcd1mqooz-t)35a gm/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 away from you atai(d2) iwvxunkb.ta+j 2r1a - :va +mn 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 ac r tndin.:)jvax+(2v -a+2uiaa wmb1 ktual 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 rl * 6sikvww-+c7k h/wis 340 m/s. What is the frequency heard +*k-wk7s wr6vwi h c/lby 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 t,f1kwsczo*x2m9s8hw4fg o ) aj c l mt.4+yo*mrain horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequencg,m*wxmo.a2tfy 1zos9k)4m8w+ s4oc jlf * hcy 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-m,z pxw x13pst /p5jc.kHz signal is sent out, and a 42-kHz signal is returned. Assume the speedxz s.p c3j ,/5ppxtw1m 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 shocnw4u +akd35 cpb1 -c a14truazk wave 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 speem 22a5tu4(x v8l9eiugcw +cfud of Mach 1.4. What is the half-angle of the conical shock wave fcwut4 f 2euxc(+gum lva895i2ormed?

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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 Unitedlp b1867lzp:t7 jxfjd States to Europe with a Mach number of 1.05 where the air temperat6j7 8lpdpx7f:lzt1b jure is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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