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习题练习：Physics Unit12: Sound
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 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 followind;j7n8u-ha 7bxn bu)jg 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 fast(lbb )y lyi /:1.gerqoest 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 s( 0 szw8e,scl ub-p8v)zf 5baiteel 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, whabmq9d58c* qnjsf (8 l2ffgqe(t happens to the velocity of sound? (Assume that all other factors remain constant.((bqm2segf dqq8l* 8j95cf fn)

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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 sou -yv-zz- ztn:rqcun zob.my2,0c y7 6nnd, the velocity of a 200 Hz sound through air yz,-zt07 q -nu2yyc z.- 6bvnnczorm: 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 297l9cv,2y 7 irurxwbjqay5i ;s,m f//bwabs300 Hz sound in air isj,ya95csi7r w23a bsb 79rf/m,ubiw xyl qv;/

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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 grezdy r, ty33ul-l-nq *zater 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 witbaglug o+ q11* 32ay +eqznm1rh frequency 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 unifor15k ze9uzuyedv .e+. jm94hr mmly in all directions. If you move to a point twice as far awz.m uuez4ed9ky h 5ej.v 19m+ray 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 p a6v5rxh1hq2r roportional 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 distance d from the sourzi5 4ky t7y9.0yedyaice is I. What is the intensity at a distance 2d from the s4.za0 9ti yy ydk75eyiource?

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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 sourc pb:gb.o f0 4kh;tv3per 0y/ece that is radiating equally in all directions. What happens to the intensity opt04pfoece r bh/yg 3b;v0 .:kf 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 sourcevzex*:) li0bud-n ,iq that is radiating equally in all directions. What happens to the intensity level of the soundxi :* b v)uzldi,-0qen? 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 /,ko nv; r9zh y;)vebla 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 emitting a pure tone. What charactezaby5u c wfuwlr(,4 77ristic of the y7ab wu c(4 lz5,ru7wfsound increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loud ,6 nt2m w7r:imezklh;ness" of a 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 "pitc - 6 ythr; oqw(ssyyswt-8at(3h" 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 air imh:2 2pmg xr:nnto 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 ar9.x1fk0ohkv n e

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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 strin-lt tueavla*+w k*qbh 03mk,.g and the sound wave generated by the guitar as a result of this vibration. Wh*et3tvmku bh+a,0w akql l.- *at 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 bothd7v8cukp rbotx m i(9*:;7n;w 8wwndm 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 a* enhgdgynxnrs+3n dn0.i 8 :3re the wavelengths of the three lowest dxn8 .3*sr 0in e:dngh+g n3nytones produced 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 200 H )9. :divmjjigz. Which one of the following frequenciesj jgi. vd9m:)i 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 frequezrfi,3/ 5yh-qh ot fo: 2q7mlmncy. Which statement is cq35 mqhtlfmoyz:h-7 orfi,/2 orrect?

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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 end an2 k hnt;x.1a)qcfsg 3ld 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 ty9 u ipgfl zvvn;18u,7he wavelengths of the three lowest tones,9u izypl8 u7vfn 1g;v 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 20u(-*gws-m 9rx*gx.,nxwgtdb0 Hz. Which of the following frgw x*dn bsx,.*(x9tgr-uw g- mequencies 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 closigg: dmf )uk jc.sk6kjm-no),g0g2 x8ed at one end is resonating at its fundamental frequency. Which statement ik )mjxs8km-dg:j u0g.i)fo2c6gn ,gks 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 speak :y+;wjtgsl*bers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz ojgy;:lw+*bs tn 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 should owqm)7okp2 r4have

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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 parzia- d,j+dfq+ ticular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones isifdqjz ,a++ -d 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 explaioao;0 yqgs716e2b kef ns

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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 statt++p psm k etcw)9 kor,3 ly sf)6./j;jl3upxfionary observer. The frequency heard by the observelxj)9 k3+cwj; p)ylp. /6f,t+m kstoesu3rf pr 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 frequ5d z,.rz+0 rs vml7 xjt*il-du70m pggency heard by the obser*,0sd+ jg .lpmv7t-l7zdgrzum5x i0 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 double its MACH-speed, its half +,qxuuwxyjo s8n;) lg3hoa 4/-angle will decrease by a factor ofylxx8o+ a)uqjnh3;/ uo4sw ,g:

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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 m/s.yten), f t)t;b What is th)t)bt;tenyf ,e 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 g5h2xi i51e- p5jwcv66 lbrxe 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 in air is 340 m/s, aqhal )(d 7bs l6/vp/nd bat emits a shriek whose echo reaqhb)d a(/n7 /6vpl lsdches 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 ten,y 6 i*gxeo0tl7sq9 b3yc u+dr(m3s. 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. sk h lnx kw;hla74w78l6hk+p n(yy/6v0 s after seeing a flash of lightning, the distance to the lightning stwn xpl( vh+sk;h6ylwnk6/ 4l h78kya7 rike 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 tempera 97zkgwsmx7mk j-ra 4-m*tfkd ;y mq8 1g1i/uqture 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. ( b:5t7 cbltu8e,ktyn.cy8 r.4lii c i4z.tvl How deep is the well? (Ignore air resistancibklv(ttc: .,z8.yr8ite.n tbil4y clc 5u47e, 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 v2s yo hrb*r-bei0e zo88+b9ifrequency 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 ai:oj r;pfh9g(8rvbtl )7 baf4 gr 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 souq a*ccexvwos(535ip q59h1bdzks vg +2hi *a8 nd 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-dB sound?30 .xc: rv;nujm inf3m

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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 intensity levels of 70 diqy(,l;pfqs0) i.+f ,fc+5ra k:td curgf vb3B apqbfqsri,+3 , vflic.rcfg u(0 +kytf 5;):dand 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 in a garage is 100ftu)i -bj e/oo4/ rb70 xxlva0 dB. What is the intensity lvbi -r)uaxof0 le70bj/x / 4toevel 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 distance of 6.0 m from a sour7h/pmmgb l9(cce that is radiating equally in all dich g7pbmm (9/lrections 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 6.0r9ihc 19bx,/i4sfg /5 rza hgw m from a source that is radiating equally in all dirih9r /s4,awc5hfix g zg91br/ections 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, wf3qos grao0+g1 dc -a;hhdhf6*b9 tg.hich is assumed to be uniformly distributed in all directions. What is the intensity levelhrg-o.tdo qsgba 1 h fa3hd*;cgf6+09 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 uz7dq wl :4:icdog. What would be the intensity level if two i l:uw4i :cz7dqdentical 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 zntz) ovr:qm2 - dn,gz.w/9asa sound 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 source radiata .w/g9-mz2qdr)no zvnzs :,tes 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 fv 0pgu5h7tk/ 4ikj) gzrom a point source is 95 dB. At what distance wi zk/)47ip50jvgku g thll 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 haso kkv4 /bx:2laa *uwa4*z+epw a frequency of 1200 Hz. What is the frequency of thezlw2eap kkb+u:o* a /vx44aw* 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 third harmonic of an open pi+f *9ukrcqq,hy /su0w pe is 900 Hz. What is the lengthck q,r/0 * wy+huqf9us 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 is 400 j fn;3zyxp :;sHz. What is the frequency of thy;xn ;z:fpsj3 e lowest 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 length ofj,33 blu gtj /-x6psoh 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the ho bu ,tsj3pg l6j/-3xsecond 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 ttlrpa pbu2n.+2k s9*whe 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 33f*n s(8d+7oqiu2g ko k0 Hz. What is the frequ*87okn qkfd2 s(+i oguency 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 cyyvr y+7y 6e-shortest pipe closed on one end that will have a fundamental frequyr7cy6 +y- veyency of 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 b.bf/ uub6fokkvg 90: 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 i-)/ ,x t shp kf+oz6,u* )f(kgz(j)bgvzhhkdnn 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 fcn4m dvao 82l8isida8kove-4 t--;asound in air is 340 m/s. What is the fundamenta;fonkmac- -ed8vs tv8 l84 i-a2o4id al 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 ch6t gct8mv;*zj:uq 5and 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 cljz8 mq*t t ;h5vu6:gccosed 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 the wr0sonqcq+tqa 8r f j;wm0b-m 5 (q;*zvelocity of sound is 340 m/s. How mu+m5cbfwqz *t;a 0m0( o-w8srnr;jq qqch 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 by side and driven by the same frequency of 5s/ 9n /2byxnzw00 Hz. If the distance from a person to one speaker is 5.00 m and the person detectsy29x/nbn sw z/ 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 frequencies of 440 Hz and 444 Hz. Whojarkgb* wm3n3-cj3/j)y 0nz at 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 a musical inst. (sv,)fnglbnwr2l 0 trument. If the tuner hears a beat frequency of 2 Hz, what is tvn)b.r g(ls02n w,ftlhe 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 souhge5t8,(wbm( ) gccq4qq0 v qznds produced by 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 of sound is 340 m , vq(84c5qwbtz(hqg)q gc0me/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 tw6b* tr,7ntknjd-k /a2sb b-vg o 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 bn,vb6g t-krnb b /k-d7 j2sa*tring 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 sounx k(xd dj2 0ev6)q ukb5z max9g)a+:ind source at twice the speed of sound. The observer hears a frequen(u m2xik a+xq5k6d g xja)):env09 dzbcy 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) approaches a stationary observer a7 +h 70ohp9 -vmbh7m ) yfvv1fbasmt:mt one-half the speed of sound. The observer hears a f-bh:p)7m m shvafv7o+y91 m hft7vbm0requency 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. d. fh8guq(6 w imllq *a3fq-*wIf a listener moves with a speed of 30 m/s away h 3-i*qflmw * 8.uqlgfd6a (wqfrom the source, what is the frequency heard 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/g25mr nm nqv3 d*e7;bus on a day when the speed of sound through air is 340 m/s. *bn 5e;d gvqmr27mun3The 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 aj6p ,n)vu9 onpmr5r 4y train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed9nu4r) rnyvmjp6o5p, 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 yoilyj )gz5:f.yu 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 hejl5 .:giy)y fzar?

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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 zt 4xe-jss0/f stationary train. The train blows its 400-Hz whistle. Take the sptszx0j4/ fes- eed 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 awa: tops9 c*i3hny from you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/sip: c3oth*9ns. 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 at 120 km/h. It blows l. ;d; . (g0uo/pog,ahjpjw rbits 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 whilgub/pj0 odp( ,; roah;wj.g.stle?

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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 yhte- ,s wfj0av::h n rn,9bc;in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train with a speed r,:chf :,v9ysnn j0 atwe-;b hof 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 horo0dpc * l8sk9t6t* wdrn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is trk st08do dt*w96l *cphe 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. /;f1xv (f z(hmn2m u);bgjscbA 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of soundx;h gn/(ufm2 z1jbf bc(smv); 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 conic;(r9nw 1 ni8 gk,vs lpa1ylj28i nh(kxal shock 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 speed of Mach 1.4. What is the half-angle of the coi ocsycg:,.i/-8bgs tnical shock 8oi:- sytsbcg /c.g,i wave 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 United States to Europe with )* q,vgnhvc2d a Mach number of 1.05 where the air temperature isd*vn,q) vh 2gc $5.0 \; ^{\circ}C$. What is the speed of the plane?

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