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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: 游客未登录  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 statex 02w/fjjp c 1dct21 mok+ea.zment?

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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 thylpmyl1b3 7litv c ),.sjw3/brough

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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 *m):bqbd zhm +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, what happens to the velocityw19cez 3dt ix1* qz-vu of sound? (Assume that all other fact9-3viw c1qdt1ezu*xz ors 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, tvzjpnx-d qupdfx.on30y*6gfm+.s/; 7n, ceahe velocity of a 200 Hz sound through aiqn.. xgnpx0n,jy;+p*c 6/mefz-3 o7f adv dusr 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 wavelengtzexvb6(c0d *oh of a 200 Hz sound ie6(zbxv*oc0d n air 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 fr b7ihiq *g cg7/9bcya1y7+pdxequencies 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 (yn1k-ityn)yhgw)8 g 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 unifor3v5(bf(4lc 7f abpqeomly in all directions. If you move to a point twice as far awl a3vpb5fb4( fc(7o eqay 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, intjy v1n3/uae;l (u b/gun27 jrsensity 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 dk9/ch7 jq/)z ozvy;l listance d from the source is I. What is the intensiq9hvk llzzo//7 jy );cty at a 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 fitr+)m f.*zwi. rlpv7rom a sound source that is radiating equally in all directions. What happens to the inli.v p7r +*t.rmfiw)ztensity 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 radiadh evi3h apw5:)2rpv 8ting equally in all directions. What happens to the intensity level of the sound? It droph ):vwdrp53ih peva28 s 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 becomh +: 8 yj*ftlxh 2aubvqk)q97-ljm*zyes 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 tonevw/e 9my*-zglm 0ae sm.qcvd1zqz3 73 . What characteristic of the sound 3q1 awm/vd-l0z q7mcg.ee 3zvmz9 ys*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 ni /is 4vhp8//)btkqu fote?

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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" o f3 ;q dz46ulvvds:jt 6tu8k/mf 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 fro8u,:9. oc:vlb) mgvrq rch hl:4abu p;m 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 displacementttz 9 9h*ihe+2 s2eal1 zycbh) 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 generated by tziilmx fw0qt /cun-5 0yt i../he guitar as a result of this vibration. What do these yn0i- 0ficmut/i.l q/zw5.txtwo 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 i6(+ddcf jxq 7ts open 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. Wheizj ee dl ;708-q5dot3b(oulat are the wavelengths of the three lowest tones produced by this pip5eqltieoeb(-zlj ud 0d 7;3o8e?

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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 Hz. Whichbjgfh 8x+ h4n7 one of the following frequencies will not resonate in the samjh+8 hfbx47g ne 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 fundamentali6qv)wbkc obr.7 xw./d /6dy**bihy j frequency. Which statement.7 /6i)v*rjhdxwd/bbb i*w.cyq y ko6 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 cjo*wrz5,vouv -k 44nand 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 wj9)( z/atlrxiavelengths of the three lowest tones produa(lrt iz)x 9/jced 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 clo9tl6p lks3gb3(r)4uaguzv 8 6y7boy ised pipe of length L is 200 Hz. Which of the following z7ogyy(4k au6) ls83urbtv3 i9glb6pfrequencies 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 resx4*wwpfa;aw5e*c 9 ap onating at its fundamental frequency. Which statement is correcte9;a pcx4a f awpww5**?

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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 the same source. lw pd c5m*pa6cz :*eh0 Each speaker produces a tone with a frequency of 200 Hz on a day when the sawlph0ec*mdp56 :z c*peed 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 bea,*vtk17el 8is fk2 ikots, the two sound 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 sound 5; 48acrv: -7ovb igczjejut de-cg. 0uzba,.ed together and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one o bc.-5 .bev74uj8gg :t-vdc rz 0azajeicou;,f 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 explains spp 6-c/6m/rb/+. v dz4 bwe 8+8gukvnlgbvoj

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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 obser h;k o)u6r. h(yqq1elbver. The frequency heard by the observer (yhk bl uo)qqr1.; e6his

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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 obseruaaqe 1bdpmic64 t1 09ver. The frequency heard by the obu6ae cq910t d4mbpai1 server 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, f,gsf* e)un4aits half-angle will decrease by a factor fu)nfg*4e s a,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 pi8wee4p.w(5 : aioke1h /kvcfrequency 45 kHz in air is 352 m/s. What is the air temperat4kkie. :hio p/(wce8we 5vpa 1ure?

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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 t0 e6bac5u2nabv+bd;s he 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 of someao3m)a +m l/ 5mo,vfund in air is 340 m/s, a bat emits a shriek whose echo reachesol3ma+ mv)/5fam eo,m 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. The tfq9r(nth5k-jgi l7m, ;b7i f h-re(owemperature 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 d) -p . zm2mt2dy6pjzmof lightning, the distance to the6j .zd m2mzpmdt)y p2- lightning 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 s from a cliff on a day the temper+bkm b8ak4b;qndah9s 1 h6 f g8qnv1byqbq7 2,ature 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 splao*cjs2 w69qo rsh 2.5 s later. How deep is the well? (Ignore air resistance, and assuo 2r*woscq j69me 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 wav i s(p9 l6ysm/r9x 92iq1gsaape 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 a)3vw) mubodhxk/3d; 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 sfo fx6:7lxfmb.cp4 uzqp 7 ;x,ound 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 hnybou4m.zp8.d,8x c j( us6 fof 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 intu.-im ren 6s0densities of two sounds with intensity levels of 70 dB sn id.ur-m e60and 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 av x3jnq2. g/k8 zfqp9oki q :a(hc)4dr garage is 100 dB. What is the intensity level generated by one engine?v r8xhpo3 4qk9 gknf id( )j.z:2/qacq

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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 d3mis9psu)9hvk xq)4x 2xb9ez istance of 6.0 m from a source that is radiating equally in all 2e x ix)k4pub)x h s99qv9s3zmdirections 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 dis9h,zemosz -2 ).vv+zk1objl wtance of 6.0 m from a source that is radiating equally in all di v mewo osb,hkz.92l-zjv+) z1rections 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 uniformiqu1i m.p 76+f9fu8ucx2s tmrly distributed in all directions. What is the intensity level at a distance 5.00 mfiu r6 8um cixfms+ tqp917.u2 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 s g)4frhe*7jxdistance 5.00 m from a barking dog. What would be the intensity le 7h*xj)rfge4 svel 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 from a sound source the intensity level iniwsofvt; 9) l ecdj6u ,,s1ip4 :y0iqs 60 dB. What is the intensity level (in dB) at a in uiidcy1l)st:69; o 04psqf ,,e vwjpoint 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 x38gzn zm1w3t) waqm o2z i1w*qxbi3)is 95 dB. At what distance will it be 75 dB?* wii8wobzxng2az) q1 mxm3q33 )ztw1

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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 1e) 1dz0hlkh:cj 75yk 9nr7caf 200 Hz. What is the frequency of the fourth harmoni0dke)n1:c7ylhh fk ja9z r 7c5c?

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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 harmonew(-ofydz-85(zmbes2f 4, ql.nzc uaic of an open pipe is 900 Hz. What is the length ofl2z,e. -fzm(oea4cu sb8(dq-y nz5wf 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 a8 p l6/5j eob1u;qzhtcsi*f5ln open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonatfb58q/chjlu z ;61 otep*5isle 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 hlgcki 4v+ /v4gas a length of 0.80 m. If the velocity of sound in air is 340 m/sg vkg /li+v4c4, 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 tempera 8+j4zltt6 wa *qk6tjrture 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 is thekslby24z/1r ; lj(d 8sxqr )ls8 ckfh: frequency of ds;y r8)2zlj slcl(4bhqk xf: 1/8skrthe 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 end d0 rv8i o7(oxkthat will have a fundamental frequency of 60 Hz on a day when8or(7o ivkd 0x 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 m6baqd z:lg1baq p7+5zqb-* cin a room where 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 in a room whereoaw:6ag01ax kj6 hzf8 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 w hs kndp) xe)7,0s9oajhen the speed of sound in air is)oksjn0 9,)hpx7es d a 340 m/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: on q0,fzoerc;l-e is open and 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 closedocfrl-,0 z;qe 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 emi ee,g4 xynmh5-t a frequency of 800 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 woul-ne,4 e5xgmyh d 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 g(9s1kg9pus0wpcr)l:dzd+jby side and driven by the same frequency of 500 Hz. If the distance fg (p) zrl:j pd1wku+cg ds99s0rom 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? (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 frequenciese1d+ +nlxvs;*4zd zq o of 440 Hz 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 fork to tune thgz:t , 8geim+fgj z2z*e frequency of a musical instrumenttf8g * :jm2iz+egz,z g. 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 s *qln6: gen3otounds 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/s?3:q ot6n* nelg

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The corresponding violi 8ky9lsnc:)/wbjy ada :3in 3sn 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 98ncsb /:i ya:swk3 3nlad)yj 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 ats 0,bngesq1o7q p*387r3kv pvqfn9md twice the speed of sound. The observer hears eq9nr7 skmqvdo8bg qfpp*0331,n7s v 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 stationar dzr vq5x)xz,;y observer at oz qr;zd)vx, x5ne-half the 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 of 30 mp8lb:k zfafsypk4 v;hzrtm 8n 8056 f4/s away from themtsv z8r 0pnbh6 a8f 4k;:l45y8zpkf f 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-p *s*.tb -ljvw,c: o.vq vql4;xrg:lmHz siren. It is traveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the rvvx:o.:*;*rgc-,lv.l4lq w tj bqs pmoadside. 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 approache3k 4 quv;s1nkns with a s43kq nkvs1un ;peed 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 traveling toward you at 120 km/h. The train blow y c49qjrj2,9t0ckcc v6f bl5ss its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hq jf,95 lc42y bcc6tvcj09k rsear?

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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 statior)x n9rre 2ryv)7:jv enary train. The train blows its 400-Hz whijn)x 27 v9erry: rer)vstle. 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 120 km/h. T-tk3yn)5u qfh3mt :rl o kfg9el5 f*;ihe train blows its 400-Hz whistle. -fl kyt9 3r:;3g5qinktfoh*l um ef5)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 sg ij+7l;p +fzvtp,;akm/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequs,fpvp tla;+gi7 ;j z+ency 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 scfvg0df596f ho gc, z3 hi5z;round 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 vf,cz3 gzr f 6 d0c5hh5i;o9fgspeed 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 i(2v d7b wz1 -hra) zjhdg+z,mis 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 approaching the train w1hdj+ghw2 b(vda-zrziz ),7mith 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-kH+y 8zucax0;zfoib(s:hoq n0 0z signal is sent out, and a 42-kHz signal is no0+foyz8hc :(bi q; sx0z 0aureturned. 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 prwwsnn 99 2aa.j6 kbfupo*ly 3/oduced 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 tezu0w;(c)lo1q nrrcj * y ;w nki -6k-(3afeshhe half-angle of the conical shock wave formok( frz-easy0;crw6i1eh*c nw ) 3 jnq(l;-ku ed?

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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 Uxtt-d,t9tl .pa x0km-bio--s nited States to Europe with a Mach number of 1.05 where the air temat-o tt0.,-ps m -9kxbxd l-tiperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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