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习题练习：Physics Unit12: Sound
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)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://51fly.win/test70.html
 作者: physics  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 oy1+y cf4va.c-b:v kjfalse 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 condwaqv;how6ggz; 7 u4:kucted 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 stee0wg edfo4f3x:rnq0 z*xs)x o3l 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 7pnd8or2bs bv c d6 2c-dna/8lthe air increases, what happens to the velocity of sound? (Assume that asr/n bc2a b d86lov72cpn-d8dll 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 Hefi *x 86g-zgcz sound, the velocity of a 200 Hz sound through aigcz- x6g i*fe8r 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 kt;j m97lbu j6cpz-h h1l4ck -of a 200 Hz sound in air bl- k;lt9h kjc7cuh1p 4jmz- 6is

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequenh 48c; b1mqfpdcies 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 call+j*k* z kn39*hkih esved

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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 unif7nfv8q kfxhl -n8 oo63ormly in all directions. If you move to a point twice as fo fq3 6onh fxnv7-88klar 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 tw;8(e zq gxhsb7+5dk4 8mxj c*eizt8q. 7 ogqis 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 fktiwgx; /c+7 distance d from the source is I. What is the intensity at a distance 2d from th;7wictk/gxf + e 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 mduaai1g;lk+04nuhh1x rc /m17yz9 tsound source that is radiating equally in all directions. What happens to the intensity of thzr mu1xya;1+c mh nl9170g4duaihk /te 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 radiating equt 3ef6hgp,a0a ally in all directions. Wheaa6th fp 3g0,at 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:88t.i8wz vzb xds in* 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 tr q v5ntrd2e)xj nqs3jv3). 5yone. What characteristic of the sjrn3 s )3vj5x5yn vt. 2r)dqeqound 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 musica.b1v 83t2m q cmsmr .adrz;l8el 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 musj k 9td1f7jkt(ical 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 intou; e6xnams/ytcm8-w;-ze8k q b en: c3 water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacemhia fqc fr -2pe5)bgapm ;u0+9ent 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 andt b0jtv.,re6y the sound wave generated by the guitar as a result of thisjye6v.rt tb 0, 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 open at both endsws5 .yib;f5djw59lkuf yb )/v)ns,ow, 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 three low2(7p(x d +quxyqumaq 5est tones producu(q p2yxx7u+m5dqa( qed 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 lengthkg*eb(z;+xe*q7pmq p.i q 1 c t0pl:ml L is 200 Hz. Which one of the following frequencies will not resonate in the l.t0l bmkpp1zx7m ;qeci pq +*e(g :q*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 resonating3on4s jmn:awc7sr a1l l3 q12 h0ibf/e at its fundamental frequency. Which statement is correctaa frn s2s0c1l 334qmijh l ne7o1/w:b?

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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 an qy xpya-7wtt.0 :7siwd 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. Whatwq z5e() +zhwz are the wavelengths of the three lowest tw5(hwqz+z )ze ones 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 osx)grxs 4 4x7e: *m. qck*nlwqf the following frequencies will not resonate in ths4we.r qxqxs4 7g)xkc*m :nl*at 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 fundam-8wxyn+*/pd9 rvzu7r vela c;ental frequency. Which statement is correl /+cnray 8 7-v r9xdwzp*evu;ct?

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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 driveo) yitf1z4zpff ade3 ..j8c r*n by the same source. Each speaker pr.fpz8*.yzeoc f r)fia4dj t31oduces a 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 wa1.2lqdtmc+g nsuxu-0 ves 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 frequenca/1uf tamzn*)y is heard. What hap*tnm1 /f) zuaapens to the beat frequency 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 exply 5f g8lf;tzf -cuo)k5ains

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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 stati m)cl:gkuxfn6ws*52 i onary observer. The frequency heard by the observ)5sk 2c if:gwl*mnxu6er 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 stationary34w dhw uge s1+n18jbw observer. The frequency heard by the observer i8+s gw131hw4 ewjb ndus

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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-an;g6b ktq h;/e1f4qlg 6hi /:1hydwpww* vpau3gle will decrease by a fghe;4h6 ;dfp / wqw1p/q1gbt3hu lwa:v6ik*y actor 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 frequency 45 kHz in air is 352 m/s. Wh-bt+l qd*k25zg gboh: at is b2z+dqbl5kt* : h go-gthe 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 sp/zb-yz (b mmi j r4-ko.+ad.tlbk(yn8eed 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 u;.1pfg,j)m x4tr;havkrd v. is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object thf) drha1tg ;v.;v.4 u jpmkxr,at 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 tempera4 5puyvd-hve52ei0we:a m+m ature 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 seei nl n+o;fue)2fwg,qw0ng a flash of lightning, the distance to the lightning strike is a ofe2)qu,w n0gw+ ln;fbout

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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 twrfmunj8z;dm*sk t8g:/ 5i. ahe 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 2a5cv a )9y5bcj 5;upnz.5 s later. How deep is the well? (Ignore air res95anpy cc ;ajbu) v55zistance, 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 w. 2nyoo)wowi 4ave 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 acn9 vc7hcqg .*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 levehqpu7.wau ( 5jl of 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 1vebn9pxacj7 j6c x 79of a 70-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 ovps xms.3/z*d f two sounds with intensity levels of 70 dB anm .vpsxz/ds3*d 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 j+6a 6wg-q ajl100 dB. What is the intensity j+j a l6-qawg6level 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 sourc(bhtjou+ 5 9c mda. (0bi*oveme that is radiating equally in all mvi( 0*j (ec5 +uomb9od ha.tbdirections 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 sourcevm 4:)n 3kncrv. 5,xgxcgadmk 4gc6n ; that is radiating equally in all directions ism5; .,:v6kdxk mgc c)axgn n3v4 4rcng
$6.0 \times 10^{-10} \; W/m^{2}$. 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 q::k o:2k.p5 +jtnpzh)midmg1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distanmo:m:i+ pp5k)ndzkt.j q2 gh :ce 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 5l w 98e 9r3d5xa3sq)w f)fg9b 4wicryx.00 m from a barking dog. What would be the intensity level if two identical dogs very close to each other a fw49)d i3 sqcr)lxe 9rb3f9gwwyx8a5 re 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 d -lpk10*vw oum from a sound source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assvd0l po-uk*1wume 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 p 9ic-a + 4)ifopq0tt opx:lks9oint source is 95 dB. At what distance wiip-0k t:oc)xp4f+ q9 ist9olall 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 toneae xs.zgy 4l;1 has a frequency of 1200 Hz. What is the frequency of the fouzs;ea 1yg4lx.rth 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 ujs1 3 mw,,spxm / a6hw1bkyf(harmonic of an open pipe is 900 Hz. What is the length of t,,6kp(s1f absumjxmw/w y1 h3he 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 is tham19bkfv djca u0pw:( q,sj48 e frequency of the lowest tone that w md(,asfjk9 : pwju41qca08 vbill 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 osiic8rd )(i9di w) o6kf 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second s)i86d)(iwc idrio9 kharmonic?

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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 .f3r8 dw mor09n9baq othe 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 sl t9v3llk* h/(9bjhkp3 ri*lHz. What is the frequency of the third harmonickr(**l 9v/bllh sp9tjh3kil 3 ?

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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 c6(9a*,j-e k9gr8wv8sisgdhq6mpg a rlosed on one end that will have a fundamenta86p w,d rqim*krg6g9-89a esah gjsv(l frequency 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 the temsri7 dq3 l(hl+jk,q6hperature 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+r:t2izbi *3gp3i bn q in 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 m/zd(p2wze) sthe speed of sound in air is 340 m/s. What is the fundamental fre mew/d(z2sz)p quency?

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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 s1fr+ x-b0 bwlrame length: one is open and the other is closed on one -01rx wlf+br bend. If the fundamental frequency 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 of 800 Hz inp3 hzrj;+fc;5x cmosh0 d 2b-f air where the velocity of sound is 340f2 +h-bchcxdz3f5spom; j;0r m/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 by side and driven by the same freq0hzvk;mwv 2gd 3w6c)ruency 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 t6rdw gh;mvcv0wk) z32o 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. What is the beat frequency?vk o.u)a(e8f)idkz* s

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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 freqr8r8 w,vptv3- qj0 tsquency of a musical instrument. If the tuner hears a beat frequency of pt8-rvr 8q t,wq3vsj0 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 arfn+c kk1 jflxz2g5a8bz4+dh/e 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day whe jkk f1gxcb825/f +h4n d+zzlan 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 violin strings on two violins in an orchestra ared82 djrl*lj7n found to produce a beat frequency of 2 Hz whenj8dllrnjd7 *2 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-Hq dpqs b7rmy rour. ,h(qz.;; :3slcc;z sound source at twice the speed of sound. The observerb3qrzs:. ;qq ;cyr;pm7 d(r.hso, u lc 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 freq dxetz1dl -6w o- l/:3kwmc,fauency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hex /c3ktfmw,e1 l6- ladd :o-wzars 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.zy 5f 7) c2di.gtuvda- If a listener moves with a speed of 30 m/s away from the source, what is t 7 zd2c.udagf)-5iyvthe 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 when l,z ct,d;al5o the speed of ;c, d5oal t,zlsound through 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 heard bqz o *in+zl:anw ds,/9(mo2 tvy a stationary observer when a train approaches with a speed of 30 m/s. The fr dnzqo+(om2tn w:zi/v a,l* 9sequency 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 at 120 km/h. The train blows its 400-Hzdap3tm* nb/elcdi5*1 x 9n) bq whistle. Take the speed of sound to be 340 m/s. Whatcnxb/ m*3da5ldtbi91 qn pe)* 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 fw;n uku4a1.e a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear?a;.kwnuf1e u 4

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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 yoch txyx;mg ;:;u at 120 km/h. The train blows its 400-Hz whistle. Take the spcx; mhyg xt:;;eed 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 whistle, and ylq 0tx-4i/so2t wtrv8ou hear a tone of 400 Hz. Take the spr2tt 4i q/- vtw8s0loxeed 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*thu 3(2y--cdh8kp6fbpofj 7ush2d q sound in air is 340 m/sp3h(bd qfo26 t h-s2u yckjd*f-u 8h7p. What 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. Assume the spee2 hwtyedm;h53 d of sound in air is 340 m/s. What isewdmhy5 t;32 h 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 speed of an object. A 40-kHz signal is sent outu.h-q/v63y k9lkqc tz , and a 42-kHz signal is ret3zq9 /tkuhk 6- .qlycvurned. 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 produced by a supei.um 6:x. vv ec65:i6lkn brmkrsonic 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 is2bi(4y*ps3k x m7v03;id fndyka s1qz the half-angle of the conical shock p32f1sb(v s kmyqzxdkd7 0;3i*yani4wave 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 United9jonkvs55nzht w :eoh f6b5+7/ .krzc States to Europe with a Mach number of 1.05 wjzfk5ro5:cv 7whn/e5ksz 6t bo h9.+nhere the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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