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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 statement?, :c94crsp j t pp3w.i8ekss/z

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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 fastest*zc9-y 7gf oxi 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 steelg6ja9 as1(kh l,mjkb ) 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, what hcr,qu 432e0 a1vw: yakvn3jsiappens to the velocity of sound? (Assume that all other facto c1u ky v0:aajr3sw42inve,q3rs 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 of a 20.g, dtai;,yqh kd/uz1n9xb/l 0 Hz sound through air islxa9/yzu.b1t ,/hkqnd ;d , ig

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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 wavelengthzo i6ui2qev*66. yoj j of a 200 Hz sound in aijy z q66vu6i* oe2oj.ir 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 greater than 20,000 Hz are callyetv,lw06 ddu/ m1epmrtqx2. g;e3 2 ved

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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 lceb/v o,h jb r9:qqgg nb(,uuc/k23w ;(vb*b 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 uniformly i39-b krtgir k e:qef++n all directions. If you move to a point twice as far away from the source, the frequency of the soriqbkkt e93:ref+- g+und 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 wavey7yve, 5azf1ts, 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 dia,j5pgw:9 qn2z+bdvhiid/99p6 qm p nstance d from the source is I. What is the intensity at a distance 2d froniaibqm p+ 59 h9g qnj:29,vddpw6p/ zm 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 equall0+ +wp 2k nkhtw cdzkl5y5t4/gy in all directioncz4+pgyk+ 55hk0 d w2lnwktt /s. What happens 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 fsqv lu;. ul /;wa5djd6rom a sound source that is radiating equally in all directions. What happens to the intensitwql5d; v.sjd;alu /6uy 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 louderoh7basb,8ul r7 /okr- 0cwoa/ ?

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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. tt x1 ft/+)pghd6/dbi What characteristic of the sound increasesiptg1/+hdf)btx t6 / d?

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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/bajgv0/. (;0t kqzej; ivfjd;0dtyx 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 "pitch" of a musical n+6y ;nh uk .(ce7zc- wi9zniimote?

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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 waterur/c2zjd o65i

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacemenosml),ng(:nu;kja * xt 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 genea y9 l6c l:*zelodz0bs*q rq;;rated by the eo60b q : *szrczyd 9lql*;la;guitar 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 open;+fm2mw/k8 a-diofhk ; dr5bg 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 the three lowest,6*,il -m *onjdbiqh z tones produce joizliq*-db6h* ,nm, d 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 resonayidakxxf5 p uo lj;byj)o50/wf7 091cte in an open pipe of length L is 200 Hz. Which one of the following frequencies will not resonate in the same j1 0ykucil7 bayo5/wp0;)xd f j of95xpipe?

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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 c.: +w)tted(f8xi kra d0rm;mL is resonating at its fundamental frequency. Which statementk0wte c :.rr maf8d(d)xmi+;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 open at one exx pr/lgg u hzj681;q2mrylt;4*x/ig nd 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 tpk1m/ az).oo phree lowest tones produced by thia)k p.zm1p/ oos 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. Whichhngw) t hsa1av *u7fa:e8 y+vixz(j.: of thef*h jg:x .y87hvu: aavtws 1)z(ei+na following frequencies 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 resonating at its fundamental freqk moj5y dw2k/-uency. W 5/mo2kkj wd-yhich 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 sprtc 513z+/c,s ti7ixhfkr- uq eakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a dayrritc1z +x,7 u/f 5c 3i-qkths 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 sk )dp7u-y-:jw+ ohss 1lllc t2ound 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 sounde84f+xqk 6oqikd together and a particular beat frequency is heard. What happens to the beat frequenc4qfio+ kq8x6ky 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 explaa2gy.r d 3zl s jinfwf5;r9;u ,h0o:muins

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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.(c:oqf(;, foilpib md,;t 9rl(gb1pk The frequency heard by the obser, ib ((;p(ic: blqokm;,9orldpgf1ftver 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 sxe; 0f9i 7ahmztationary observer. The frequency heard by the observer iha7 zx0mi9 f;es

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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 willa-w:qj nj8+*dd-ge s4w .v sec decrease by a factorj-dc.gw+w*de8nsj q v- :4a es 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 freqqbz k:vw/*)dfl bzi 4/uency 45 kHz in air is 352 m/s. What is qz*wvi4fb lk/d) z/:bthe 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 sound fy1 +bh,.qxvmihp,f: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, a bat emits a shrg9g/s- kik 2qm(qs 2luiek whose echo reaches it 0.0250 s (2gqsglu 9km /- ksiq2later. 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 echou9l4dtg 9eb- s in 4.00 s. 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 5.0 s after seeing a flash of lightning, the distance to thbt7-9ww1 sw :u3naywz1c / kche lightning strike is abucwshwtbw7c3 n: 1az/91y w- kout

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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 clpj*.s 4ctb*. jkju4fgiff 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 an;dt0e 6hvq1(k3dwh qh7vvr4 dd hear the splash 2.5 s later. How deep is the w0vkdv6qd hw 3re7q;t 4v1 (dhhell? (Ignore air 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 wavebsx a:8* vm ytc7z6ncm8:cqt vg+y+2ab7bw0x 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 d:)dhay*g g94r p,qan ,n,clk $23 \; ^{\circ}C$ 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 intensiwpf: c)3dj4ma8c f1unty $10^{-3} \; W/m^{2}$?

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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 sou 95vt a /tjlhxbmt5ciq;,iw;j u66/vwnd?

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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*qt, 5f rns.j0ccrud4eq 7fnk )-u/xx he intensities of two sounds with intensity levels of 70 dB and 40 dB?t)rc cx/5n7n*qurf 0ekd.4s -f,juqx

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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 8qxhzx/.i -cnthe intensity level generated by one enginn x/i8x chz-q.e?

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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 so +p nk* wzn10o)ttlwul dt*c+sx,9i h,urce that is radiating equally in all dttt x w,id0s nw *l+)u9+ *hpncolk,1zirections 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 source that is radiating equaz nb sw.johr-l2+l):u lly in all dh :brz-2.nl o us+lwj)irections 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, which is assumed to be unifo3 )*gsbiw0 - y48y2mfivfeje prmly distributed in all directions. What is the intensity level at a distagy4wevjy 3mbf)8 e*-f pi2i 0snce 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 fn6wnx/s :-gp +k)yxyorom a barking dog. What would be the intensity level if two id - xsg:y n6y+n/wpo)kxentical 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 intenxq (//fc:gokqsity level is 60 dB. What is the intensity level (in dBkq q/(x gfo:/c) at a point 2.0 m 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 level 5.0 m from a point source is 95 dB. At whav 4u lcr*;jg kyj(4(vbt distance will it r* (4vjj b(ckvu;yl4g 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 has a frequency of 1200 Hz. gmyz)ie4.tlpz w0 nc 5.m,s3t What is the frequ3lnigpw5yc0m emsz 4tt..z),ency of the 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 the le5)cb7 npjzkvpk4 6l*4+ bb jnangth of thenkbc p64b 7l)vj4k+ pnzaj5*b 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 in6m psn 5z1jaj)hv8.zi an open pipe of length L is 400 Hz. What is the frequency of the lowe)mh5pjznz 1.i a68jsvst 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 leudhplns+hujnhmpl/r *8c3 29+* v:czngth of 0.80 m. If the velocity of sound i3pc*uz 8lv9n+ /ch h 2r:umnjpl+*h dsn air is 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 r ;tudtr pnl0.o 1j+lp-oom where the 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 s17yrk428jpwi2bfn 4kq (j mr330 Hz. What is the frequency of the thn7rji1pjr4myf2(4 q8k k b s2wird 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 fsa 4,r :qfp6;q8qql7 scw zjo .e-dk3have a fundamental frequency of 60 Hz on a day when the vlsz: .jwq48c6q- a f,rqop;d qe7f3 skelocity 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 t8d20u cdqo2 q5dkiw1 whe 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 i30cfqc;4(hv ds2g f fan 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 wt2 ko wah:np32d;0cv lhen the speed of sound in air is 340 m/s. What is the fundamtn3cvpd2a hl:;w02o kental 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 other is:rky.hc 8mpb; closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of the clo :mykh8;.pc brsed 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 wh/tdwr ofqjdtji;yw,k y )jv 2:27 qf-(ere the velocity of sound is 340 j7vq ; wkqft/ w,jt2fi)doy(-:2rdy jm/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 frequency of 500 Hr9 2ew of03dfkz. If the distance from a person to one spea wd r2kf9foe03ker 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? (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 56-nu+0znlwhxe,+m .a l tf of444 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 fork to tune the frequency of a mj8 ab*;yu; wr 4+wznsyusical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the instr;+s8bn arw y; yz*w4ujument?

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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 ww upl**q- : p frvc35es1lvcmo,y+4y two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the veloci w:rcw qlp, f -vvpl+moyec4u*s531*yty 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 vifb qtw+qbm0jsd 32 v2-ubb 7;u5gdqn8olin strings on two 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 bring them to the sames +qbqdu bndj ;b-3v87f2mbq gt2 5wu0 frequency?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An observer approachejc( h:xxjt*zcx+. :x 64pjq7br yw ui(s a stationary 1000-Hz sound source at twice the speed of sound. The observbpzxjrh+( j c.(:*xu4x: 67ywxqtci jer 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 frequency of 1000 Hz) approaches a stationarywack6--vgp i. observer at one-half tgc-iv ak6.w p-he speed of sound. 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 ofh cuddk 0c/scnww:66( 30 m/s away from thwu6 0wkd(c :/ncdh6cse 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 vn vrjr ;g+h;wr 8cd l0lf.tz,xj139ctraveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an obser0,f8d; zjvg3hnrr;+19 rl lcjv c.twxver 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 a train appri3s+ o- yu/.emhh7ettw6rp 0 moaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sounde 63 -rsmhhtpowi +7um0.tey/ 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 v.. . au7 ofx6j:p1lv eb(k jb3fni;uh120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency d k.xnv( pu1 ej7fojuha :i;fb..v3l6bo 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 train blowshvu+s3 k0gq v8kc7g0 ae0qmj6 its 400-Hz whis3 vkgeu0 q gmc h8k07sqa+60jvtle. 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 away from you at g,-3sfbwb5:gvpyc) 1,* dgwikmxf0s 120 km/h. The train blows its 400-Hz whistle. Take tfysw:m 5g b3)s dig*bxkv- ,,1 cgpwf0he 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 itsbn/ e/k bmt. /d77ugwm whistle, and you hear a tone of 400 Hz. mb k/u/ / bnwmtg7ed.7Take the speed 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 trr j)2vdx9 onr/ain horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is movijr n9x)rv2 do/ng 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 968 n v qbtsv dl4kb-aav9b*z.horn is 500 Hz. Assume the speed of sound in air is 340 m/s*vzl6 abt9-ka bbd9svn8. q4v. What is 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 *7b,wgs aox a6sent out, and a 42-kHz signal is returned. Assume thb 6,x7 owgas*ae 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 supersonic aircrafte8e5zoql mq o/ o7ko ,n93x)th 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 )7-8atldk3ku a8nz bcconical shock wavea88 ukdzc7) 3 abltkn- 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 Euronc u1k7rb)m7hwwcqg8yz39 ;m pe with a Mach number of 1.05 where the air7c9n ucb 8mwrzgy7mw ;qh3 k)1 temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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