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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 false stl4fyhb-smf/ 9atement?

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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 condkd1.ro2k4 7s cdqd 4rwucted 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 soun-e 2q ct6cu3isd 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/zy1ckz1p( 3zegywxmh.6n f 1, what happens to the velocity of sound? (Assume 1z3ey1(/fg zy 1nmk wxp 6zc.hthat 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 o ; .in4s/0gvyb ) rizczeki9x)f a 200 Hz sound through air iy. nbs vk9 c;zi 0zg/ix)4)eris

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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 Hzh* h,;ms x+vek sound, the wavelength of a 200 Hz sound in airev,s ; kxh*mh+ 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 frequefr 55pgm9;ahrncies 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 lessh-j 6+sgnp/.vgw * eq7ajc0ow 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 emitting2oh+)yd2dm(8 n tuo ff waves uniformly in all directions. If you move to a point twice as far away from the source, the frequency oft +8m)hf2uod2dny o(f 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 proportionalffyk s h35)6ts 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 l s2j *bd5)x nk/y3-paxncvt) d from the source is I. What is the intensity at a distance 2d frb5k -n )nspal*d/t2c3vxxj y)om 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 w ;yrl7 :eij(aez0z-mis radiating equally in all directions. What happens to the ;j -r :y7z(m0ezeiwla 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 radiating equy jrzo5cv55m3n vgws,u7q53nally in all directions. What happens to t5z 7gnjy sq ,w5v3nv5ruo c5m3he 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 sound becomes lo v:tq99h * k*yic0zvczuder?

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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 cbp cojjz17.9z haracteristic of the c j1 9zpbz.oj7sound 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 musical norz ;job/0 )rzote?

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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 ac27);-yvx h ;ecoat;xo +cde b 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 fromqnth(w,z //re s den*s(.:lgv air into 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 wav t2g 1mokrttcr-6. uz*es 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 wavwa4t1m8f9k mo e on a guitar string and the sound wave generated by the guitar as a result of this vibration. What do these two waves have inf w k89t1a4omm 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 opn:hpm)bg dbtd1y9s4 .en 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 4 f 9fp-i:xus ,)qdli-7bsh bbf :rv)cthe wavelengths of the three lowest fx4dsu-v :b:ircifb7p)9l shb)qf-, tones 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 length3 iwe)g3c;psr L is 200 Hz. Which one of the following frequencies will not reso3scw3 ;g)pier nate 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 k 83eiscc t l/dw)+sz76u aj7dfrequency. Which statement is correct?ec w)d3+6clsikutdjz77 /8 as

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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 closed iaj, 8tb*mahz2(t e0wat 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 tr1.on jjls4f8whtq1r9pw8 6x he wavelengths of the three lowest t slf6hx88rw 1j9jqt4 wp .1onrones 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 re,wvijoph 6)b9e c).w isonate in a closed pipe of length L is 200 Hz. Which of the following frequenc).iwji6hoc ,ep) bw9 vies 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)o6sma fu7( igoqq7bh+5(r gs4sx6z d end is resonating at its fundamental frequency.g6saor)gm6qf(i7 bq(sx d5z oh4+u7 s Which 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 tso tb f+.ernz2f3t 1(m7xne(ehe same source. Each speaker produces a tone with a frequency of 200 Hz on . xn1t3o+eebts(7nz 2(m ferf 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/.iv ae -gylm) waves 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 frequency is hear2jp2*yy 3i+,sh*vr9 owx2ige df wlw1d. What happens to the 29ld*w r2*yyw +ifpox1 g,2hse3jwi vbeat 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 explainexa2zodm z .m 19g5gn.a: /6diz;*bxp cui; ems

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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. The frequency heard gb.*vm2k oi x qybp sl,-:k;h2dkro:1by the observerr 2-*s ;v,ohqbd:lp.g1 mx2 :yokkkbi 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 freh; sfp rul y-zo72zj64quency heard by the obl2 z;6f -s4pzor7yhujserver 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, lx5eb6f 89pr fits half-angle will decrease by a ffprlfeb 856 9xactor 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. What is8xy d06svymf e. -1rhmfi r83y the aifymy . e6hfy 31sir08v-8dx rmr 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 sound ino6hh 1a .oa1,xroecz) 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 emihr8 gk52jyf a0ts a shriek whose echo reaches it 0.0250 s ry5gk0f2a8hj 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 ty s f*h0 v(wpkph7o(i4emperature 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 dis 57ewwutq 3t5dyfs)3etance to the lightning strike is5f wte )d3t75e3uwyqs 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 0v3l w d9 5hm( pou 6muv03vsfljk1j3vday 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 9bajb5o+ -h z0qe,cs ows7)v5tj*x xq the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assu 0 )7s*jx5b 9 s vxbwact5,hoejz+qo-qme 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 souncr+*3 f68*44i tfry zja xwujed 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 air at;az18s qumx9b $23 \; ^{\circ}C$ 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 intens)ebn;ta 8sw8 uity $10^{-3} \; W/m^{2}$?

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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 soui- oc0vck* h0pnd?

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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 level f7d93zoh/-sca way*hs of 70 dB 93ahyws /7ad*coh-f zand 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 dB. What is the inn62xt z8n*(v 5 lytufetensity level ty(* uxz6 vtnn28f5el 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 source that is radiating equal qe30 uvm4kqu+z +,o9cg8e duely in all direc+ 4k, 3zeed v9mog0u+equq uc8tions 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 ag k7-cmds8/z u source that is radiating equally in all directions i8k m-scz/gud7 s
$6.0 \times 10^{-10} \; W/m^{2}$. 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, which is assumed to bep gn du8ms, sowhev3s)kp hogir(9+ *i: a3(l- uniformly distributed in all directions. What is the intensity leeg9 i3om8vpo3rhh (u, a)w n( :gdp+kl-*ssisvel 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 f*f(nawbb/d/e:mnz c8rom a barking dog. What would be the intensity level if two identical dogs very close to eaec:mwz fd b/n a*n8b(/ch 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 sou,4t 55zibo9jozocu tu22l ,jt nd source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m5j, z ot45tol, cu2jotz bu2i9 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 lk1 6l*v-d8h +0gqx 1 rq4jesln8fufkw evel 5.0 m from a point source is 95 dB. At what distance will it be d f wu fxln*je8s r1q+gq4k1 h0k8l6-v75 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 .x10x8vrnmia 7c tl n,Hz. What is the frequency of the fourx 0 lc1rntxm8,i7nav.th 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 hies: 3 m0/blxcarmonic of an open pipe is 900 Hz. What is the lengtc3x/embi 0: slh 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 pipr9sp v)8konn h/zq f9/e of length L is 400 Hz. What is the frequency of the lowest tone/ns 9 /qh p9fkznvor8) 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 lg6/f tgk2hfgbs:e.2 /a0 0gh apfn,nyength of 0.80 m. If the velocity of sound in air ih2b g/ft6a.akgp fn ,:gnf0s 2yeh/0gs 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 theo o1hkq4hk .4sh5gr)u 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. What is1p tqfq(vt r42 ha5+bh the frequency of the third harmo2b h+aq4pr(5qh tf1tv nic?

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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,il1ya)n0 - jtjmwy,x fundament jim),x,tlyy1- anjw 0al 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 temperatuv .+qvq6q/md1msg2n mre 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 roo/gvmyz)mj89y sq68z q m 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 s+w u3vca + q80v+vweojuo 2*pvpeed of sound in air is 340 vp*a o+j8ve0wocw3q+uu+v2 vm/s. 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: one is open and the othec.37 xch)d- vp)m i5nru g.bfnr is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of the cgmrbn)f3 cx v7uidpc5.n.h )-losed 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(a-kq jltg ozm*k+/)ajk 2;dm Hz in air where the 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 wouldljmt )do+z* k/k-;k 2qajag(m 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 placwch8p px-ss)egrm, 0 +ed side by side and driven by the same frequency 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 p8+-wxm,)0sc sp pgre hossible 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 6(ga n4.n wvwgz+s d;5vypkg* , ix:lyHz 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 fork8(4tywspmnb r8i3 jr2w0m 2vj to tune the frequency of a musical instrumet0br nyj 3 j84iwvms (p8w2m2rnt. If the tuner 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:g)ic . /aam*mkm 5lt,m(ewwr sounds produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a daw/* 5(k wrma,m. ecmtmglai:) y 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 violin strings on two violins q6tfi3dz8 l ujs;0sg.in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. fuz3g6 lq 8ji0;s t.sdWhat 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 source at twice the oo8is c jsf)s h 062dgnq+nt,basz 83-speed of sound. The observer hears ao s nbfn)8 t azs,-6i8qjog3ds+hcs20 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+d:roan 47-y6beeq h+avmm+y Hz) approaches a stationary observer at one-half the speed of sou ar- + eb6yn4+q:yvdem7ao+ mhnd. 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 1000 Hz. If a listener moves with a speed of 30 m/+ c93kmt)nnhvr5gp0 bs away from the source, what ic t+m0 hnvp35bg)k9nrs 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 travbzm)/7yw ho3o c.v x:heling at 35 m/s on a day when the speed of sowvo3:hbcmx. )oz h/y7und 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 by a statlafhcm d 8,/,oc6sp0m ionary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound is 3lf aomp/hsmd 6,0,8cc40 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 )vcl8qu8e agoa8ig8 + blows its 400-Hz whistle. Ta8gog8i+8aa)8u c lveq ke the speed of sound to be 340 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. tydmpi5 a3o st; bo2fcyb.16.The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. Wht.5; f1oydyb6 .macbt3ois2p at 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 km/h. The train blows iyv 3th p91a5xbts 400-Hz whis5yvpx 39 abh1ttle. Take the speed 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, andx k98y0brmkqgej 3r+ :kz;e.q you hear a tone of 400 Hz. Take the speed of sound :0qkk+m;r .kb9je8 rxzy3qge 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(o3mfntgir cs l1l+x1 r83t* sa6p, ab 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer lb +r,3sx(lmcit*gf1s31orta6n a8pis 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 5ihg;d 0zmiy /i; pv1x100 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency xm1 idv hz1i; ;/pig0yheard 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. Au6 ;9tt)c.p-efwj y kb 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 myuftj.tb 6;e p-9c )wk/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 sud(12fjdjaobcm:i), g7k1 yc bpersonic 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 i. p3(zltpsp(is the half-angle of the conical shock wave formiltpz(. ( 3ppsed?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Concord airplane +7jooo/.rnym mjs bq/1 u ;, lh,rld)gflies from the United States to Europe with a Mach number of 1.05 where the air temperature .mgrndq1omu l ylj;,ob)7o/jr +sh, /is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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