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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 following is a false stateic 8*xio8 x-wwment?

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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 conduct ,wu-e6q;whp eed 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 ste561gtl 22mp pxhg c;ehel 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, whatnbj)+/eq q qpd6sg: ;g happens to the velocity of sound? (Assume that all other factors remain consgjq/peb)dsq+ q6g: n ;tant.)

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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 ev15v 6si .t5 et2szzcxo /iw;of a 200 Hz sound through air ixvi2tz/ .5 se;6 e5t1wvoi szcs

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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 sounvfy6 i;3 6l i(d)+rmlbslcji)d in aii ) ysf)r63b l(ivdc6+m;llijr 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 frequencb7gi,gf.8umhxu r 2- ties 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 lehcehe-/ al b2m hdap9 -*oj(,sss 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 emittinp i0oq73idu,u i fd/3bg waves uniformly in all directions. If you move to a point twice as far away from the source, the biu/iid f0p,o7qud3 3frequency 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 wavesrhxek; 6:a pj-ujeawo217 fp-, 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 distance m/ax7jy:m7j kd from the source is I. What is the intensity at x7/amk: yj 7jma 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 equallyq -/a)qec wg0 gym)m,m in all directions. What happens0q) cmaygg , ew-/)qmm to the intensity 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 radiaa ytl*a djeb 809bhw 9tw1*7avting equally in all directit *a1 v ewabby097* w8h9jdltaons. What happens to the intensity 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 sou4 6q;cp+wri k p/dx7unsv f+s9nd 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 emitti/4cadca.y r 6;zgsf92z:qm 4opv b5htng a pure tone. What characteristic of the sound izqp2y h t 9;4ccarz om4.v5sb/gad6f: ncreases?

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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 musi4pb 8 0qbqqk3jcal 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 "pit2q lnjdvno*zkjwo (k :9t; :e1ch" 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 into wk;jib lld93+t2f +st r q6fedeyisp4e:m ,v70ater

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displaceme+ fj9svkf1b-i as;bse u.r6/int 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 gui lex19ewcxd 65tar string and the sound wave generated by the guied9 x 6e5wl1cxtar as a result of this vibration. 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 ohv*(eugfui4k d +e*dv *do,r3 pen at both 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 tdw5y l )qzon*3he three lowest ton )o*nylqw5dz 3es 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 leionyrofr ,/gybsmp m9xd 8-khi+l7-2) 8jrh8ngth L is 200 Hz. Which one of the following frequeryr yo/8-7j9mr f82-+d8psnh hli,omx ) gbkincies 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 9q1qy .p6haoyq2etmtz+g0h2(p8px 0zzk.i pits fundamental frequency. Which state+o . q0ptph8 ztaz 9pyi2mk p6y.q h(xqz10g2ement 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 open at one end and clos,v qw-xx+ik (oed 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 t2y. qhux i(eb so4r/a4he three lowese/.ay 4x(42rsiq hbuo t 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 H9pqsk, 5 ylk9-b, crmyz. Which of the following frequencies will not 9 kksply-cmbr59,, yqresonate 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 clopv igy814h+(z,n*zmo lpbaf ,sed at one end is resonating at its fundamental frequency. Which statement is correct?fzhya +p zpm*(1vg ,o4b,8iln

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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 th0)6ovi5s:uihky5v ochwsv6)gm2u l1 x 6-g the same source. Each speaker produces a tone with a frequency of 200 Hliy61) vcv2ov) shkg6ht6i -u :xumo 5hw50gsz 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 w2ft-i5rnw9gl fh1m6 kmnf-7p aves 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 /dwe0r*f* kin-3uvb y)hq0/a+vc5t zjp ( hgwfrequency is heard. What happens to the beat frequency if the frequency of one of the tones is nh(jp 0/uvew/3 *-kb0cgdy z w)h+v *tqfrai5increased?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift expla 4-,d o0ok ui,.pxe n2t4k*nag; ryzrqins

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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. 7; 3k urwme0ixThe frequency heard by the obserke mu3xw ri0;7ver 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 frcme1 s ogv8w lt1y+1u5equency heard by the observ 5lvmetgy18+ ucso w11er 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 doublk)4j-a uk-2r s kr2ph5kk2qqme its MACH-speed, its half-angle will decrease by a factor of:)uhkqk-akrkj mp 45 q2ks- r22

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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 45tnhf*n3jdta7k.b(* og 78p xt kHz in air is 352 m/s. What is the air tempera t7g*.n(kttpf dj*a3xhbo7n8 ture?

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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 yzvij:3g4/ enxj+it ,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 ofpk hq e08;on 2/:ujuzg sound in air is 340 m/s, a bat emits a shriek whose echo reacqh8/ejg;pz u nu2 :ok0hes 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. 1 ktm q3bya6ig*7c tfhefh7p:0p ;l b;hey97jThe 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 distance t+ x oc: snzo+yb27a5v2yy:5 puzxhh6ko the li2 o5 p:+b2o vh+xxuka:7y zh65sczyynghtning 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 .*zki nq,u6gjs from a 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 hehh 44/pu mh4xff,h *: n;nmtnvar the splash 2.5 s later. How deep is the well? (Ignore aipn* ,44 t:fhxmnfmhuv4h;nh /r 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 frequency 500 ay v3v ,,bj/3 *dpqiwo6qehw; 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 a k4lyu*m++ wpq*qt3 snt $23 \; ^{\circ}C$ 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 wi ,fm7guudzat) rtdw +7b 7m25ith 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?co z/( io qrf6f(/z6i.qdvao-

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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 t c4ig6. mn38pnwiw. lpcv(obdh3- d-o he intensities of two sounds with intensity levels of 70 d-(nwc3i3 p 8n6 .v gc lpi-m.hd4owbdoB and 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 100 dBwv d7 lq2 mc66yww:6yg. What is the intensity level genq7 2wwyl: 6w66mvgcdyerated 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 dyhs**;zxt/j w5dc *f m from a source that is radiating equally in al*sf*5;th/ dcwjyzx *dl 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 sourcewnzqfoop8/ .7 that is radiating equally in all z/opw.on7 q8fdirections 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 pow)o 8pc xba *vm-wwm9;oer, which is assumed to be uniformly distributed in all directions. What is the *w;xo o8-mp)wm b9cavintensity 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 ey v4 :,6cg 08zgaxqwtfrom a barking dog. What would be the inteyg, a0 e6zg:cvqw tx84nsity 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 frgj3q ns3h), ogt m3mfk:e-n7g.3cbshom a sound source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from t ,mho-33ns cqbgf:njt3sgm 7 3g kh.)ehe 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 lev w6i r:lzfdb+zau629t el 5.0 m from a point source is 95 dB. At what distance will it be 75 drbi +zl69 zd2at:fwu6B?

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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 1w0ll;o) evrhx/g iv ,is the frequency of ge); hvo0rv,l /il1xwthe 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 pipe is 900 Hz. What is t,/(xw n:bzd nz y4pr(uhe length of the ,uzxywb:(nn 4 (/rp dzpipe?

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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. Whudg ay-l06yoe- y 0e.cat is the frequency of the-y6d-o.ye0e 0cgalu y 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 of 0.80 m. If z 8o2q9+xv+9 qhlbirk the velocity of sound in air is 340 m/s, 2bvo xz q9+r98hql+ki 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 temtirijge ;wi0 ast/s-v6 +i1)aperature 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 7 (.dq0jiopp:mm8ft apipe closed at one end is 330 Hz. What is the frequency ofa(p: opmm jdt .0f8q7i 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 en:bk-kf1asi,lcbv;oksvf;5r g . 6+cod that will have a fundamental frequency of 60 Hz on a day when the velocitvc,.kl;os1f : ra;os k5 gb+bick-f6 vy 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 te.q7p)f8/ nbr raxb2 xhyxzthq 9kn9:qab + q+4mperature 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 teg4ab1 j.b2cw 4kasd 7hmperature 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 r8arc*/v)fe iz5 ;uk8qha2gnwhen the speed of sound in air is 340 m/s2ca8*kg)r aviez5/u qr8f; nh. What is the fundamental 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:h.al l69mi kt jvt652i22jb ua one is open and the other is closed on one end. If the fundamental fra2tl26ju5.2 kl9t ijvh a6imb equency of the open pipe is 300 Hz, what is the fundamental 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 (2 -vac8vywpgof 800 Hz in air where the velocity of sound is 340 m/s. How much farthervyc(p2a wvg8 - 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 500e3a ddupk1dms ad .;q*)u,0tf 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 speaker? (Th3udamdkda0 .tuse,q p1)d f *;e 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. Whatnk sfg7m3yf8 s mgcxj6y,6(h: 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 in/t dy2(rvxb2 /8wcdxs0jhqc,-bp1m i strument. If the tuner hears a beat frequency of 2 H/b1dri -chjqm20db2px s8y ( w/vtxc,z, 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 respn(lcc* ju 4e gf-3 et0ojiq)(4qv cwf1ectively. What beat frequency is heard when the horns are g fe14c( (vl qn)qcj0e- u4iw3fcj*tosounded 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 violis 6jj9z64ai 90x, fi7hazlbm jn strings on two violins in an orchestra are found to produce a beat frequency of 2 Hz whe i jzm0la i7zs6x4aj9j9b, fh6n 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 s1s)b. dg1,b l 8d jud9j6ifre2 jti2va stationary 1000-Hz sound source at twice the speed of sound. The observer hears 6b22ts ul sgrj.d)dvbj1dj,f8i91i ea 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 Hz) approaches a stationyexryl i7ef39 x06h g*ary observer at one-half the speed of sound. The observer hears a frequency xrhxi3 *yef 0697lgyeof

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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 wiqjg t * zval*2of1e()ith a speed of 30 m/s away from the zi oe2 vt*fj)g*(alq1 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/s on a day wha/8aoeni sde-/ r.336oz gm mfen the speed of sound through air is 340 m/s. The car approaches and passes an observer who is -.nis6ag zo 3or /mm afd3/8eestanding 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 5h+bu1ji r *i4vlger) stationary observer when a train approaches with+ hj5vlu*ri4r ) 1iegb a speed of 30 m/s. The frequency 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 travelingq6 u,j /z 9vy; gsnl-pphxf;q. toward you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 3;. h lnf, qqyxz9g/p6;vju-ps40 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. m v .o6wjuurkv:eq) -1 The train blows its 400-Hz whistljwe um.vrvo :q) 16uk-e. 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 aj4n fm 1gclbkm:,- d1cway from you at 120 km/h. The train blows its 400-Hz whistle. Take the spee 1kc4mnbcj1-d:,glf md of sound to be 340 m/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 at 120 km/h. It blows its whi.(3l;s eoc ie f-r:ycbstle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency o-.(e; s cibec:yo3flr f 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 8yg:xkgkq +8 ei ww.w;horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an obsi + w q;wgk8kew:gy.8xerver 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 5beea* i m+r ezg0eh43vt z 8y+s.ozn/horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What e. zre*+bzees/80o m4 5vnght3+zi yais 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 q,7 vln 7+ngkxspeed of an object. A 40-kHz signal is sent out,xg 7, +7qnkvln and a 42-kHz signal is returned. Assume the speed 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 wave p)h of3hf i++4g ihbiuwy8tq5 5roduced 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-yq+8sgl qt q;rj2dz (8 qyef;0angle of the conical shock wr 8q 8 jylqtsd;ze;f 0g(qq2y+ave 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 a Mach nvmzfv +j )hc-(umber of 1.hc-)vzm(jv+ f05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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