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习题练习:Physics Unit12: Sound



 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 fali 1tgm k8gdwbf+syu9c 6*d* ju:t*i+ bse 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 conducted fastest t0k6- 8,g eef i3i2qsp/ss otmwtk2fo*hrough

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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 s,ge0vd/ qcm3-ss3xvn .y),xm rk g3win 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 v lm88b(q1d6n cjzaq7c6- ibvtelocity of sound? (Assume that all other factors remain constant.)dnt-q lvaqcb 6j zi8c(78 6b1m

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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 velor29t q8+mf/fn cv 0mlecity of a 200 Hz sound through an/+ r8 90tcmm2lfqvfeir 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 H ;2rxrv,yfs1,f:uri-dtdv ywg3q +i8z sound, the wavelength of a 200 Hz sound in ; ws vrv 3,ri:fd-1uyg2fiq8 rxd+t,yair 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 called41i440dur/ t ivlfqxyu eu:k7

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequendi, +bebto0yov7. ,0i i p, tpg0dcuf8cy less 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 uni)gy77 xjt ob ea8)4lz.zy6yiz2k4 jifformly in all directions. If you move to a point twice as far away from the source, 28xtl gz4zij. )7yej6 zyi4oyabkf)7the 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 wavef4skmts)/upbru+41 y s, 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 sour4a qy0 io(mr) i;mbvza+ei ;;om*es6vce at a distance d from the source is I. What is the intensity at a dista;ei e0ay ma qrmz4 s+;i*ov6b) im(vo;nce 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 equally in all di o6;+e0os( :urskpg.3 lx3mj(ddmy29cxbbw brections. (20 m9ujo+ysd;d:c. bbx 33pge6xbm osk(w rl 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 from a sound source that is radiating,xh3vf7 hskx )e jqy8kdn,e9 ;cm9m0c equally in all directions. What happens to the n89em ehhqmvjdxyck 0cs,;3k, )9x7f 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 7s(io ;(k-q :ksfi fss2eqb9l 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 towardl,tox 7n*nm0 2t m0yvi a speaker emitting a pure tone. What characteristic of the sound inomt2 m,n0i *xy0n7 tvlcreases?

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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 musics3 rj*-ftmixj2 2d:wi al 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 "2yeni2;; /oa0w bu jpqpitch" 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 intoq3t fnty:: fk1xi20 a.vtd hu8 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 waves arr1lxz7 p :8g 9eambw3ie

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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 g 3 3x-yfwzwz(zja8c5z y im4c.uitar string and the sound wave generated by the (c-83miw wzfcy .zxja45yz3zguitar 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 is3apy3mv+1adid c s6+x 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. What are te(ba3p mjhz.-he wavelengths of the three lowest tones produced by thise.3-mpz j(bah 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 length L is 200 Hz. Which one ofvmxvvgwpoh5; , +g1m( the+wo v 5,m(;pv h1xmgvg following frequencies 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 its fund m l:/ho.ofa *xh,u(mfamental frequency. Which statement ih:*m (f mhl,xao/ou .fs 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 j7 )x +ulvvznc6240d:r.osdx1h lscd end 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 waveleng,d( j5s,:b s5vevo sn9rmjw-hf w,ab9ths of the three lowest tones produced by thiswsr(b ja,9jds 5- o,s,v: fwbehmvn59 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 l:a:2ld2-xm82,y7i xcnka zphdh. b wg ength L is 200 Hz. Which of the following frequencies will idl2n7g.hx myb8x2az:p,:ac- 2k dhw 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 onwq h27pv yw7wltjl.e22 .ov 5me end is resonating at its fundamental frequency. Whj vpl2tw wem v hl2.w5.q27o7yich 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 the same source. Eachffkqd5 80g amh/na*: s speaker produces a tone with a frequency of 200 Hz on a s 0dfk/8 ma5f:nqh*g aday 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 waves should fwnn,k4ic 7ecg7 ( bs*i7 j9wghave

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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 f84t :s7orbspl2 suy8*4umr lf requency is heard. What happens to the beat frequency if the frequency of one of the tones is increased? fl8poul y8mbr7s*ru4ts2 s:4

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift exinc*-l 7ofi p9plains

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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 freqn 09wqg -/jvd,jev 3akuency heard by the observer e/ wjkj0 anqv39,dgv-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 frequency heard (pkg jrqh6 9uk5m6lm :by the obs5pu6khq m6lrgk:(9 mjerver 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, its half-angle will decre kjk45n)3co q;f4 khipase by a o4n5 hfik) ck34kjp;q factor 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 i 0/-rrc0wrojcs 352 m/s. What is the rc-o 0r0wcrj/ 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 shr 0i +n:1rmpr3fij )lpeed 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 is 34k haelz /(j6h8hh 1t-edhi)5 g0 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the g(d5j1haizehlht 6)/k-8hhe 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 7fp fw*j chc)mp733rux /mbu: 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 ,2)dwecqruz 15.0 s after seeing a flash of lightning, the distance to the lightningd, q)2u1cze wr 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 fa0q5vvo34bje;* q/mlam(mk r qml(v g *in:f-rom 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 hear th*)rc 2om4s9 pzf(n gwne splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of souno(9*n zmc grs4 w)2nfpd 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 ofawp0)/,+w nfv1ug bt z a sound 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 sa skzf/3 ry1 s.j;6tmat $23 \; ^{\circ}C$ 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 soqd yp98ytuqr5t*h-dgt - 2l4 tund 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 of ihoh.-m)*x a ha 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 of two sounds with intensity levelsh(qp(n ewu jmoi(7izapt n49)8l e46x of 70 dB and 40 dB? aiue8ht x(owi n9pj(m4p)ezl74(nq6

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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 b m. q4fwwtaha19r+, win a garage is 100 dB. What is the intensity level generated by ,hr af. +qmtbaw1ww94one 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 equally ik.b .y pc2psw*n ask.yp*bw. cp2ll 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 sour(gdh b)wtcz l 3 5sjru-/s:*ahce that is radiating equally in a h gw(ds ):ruaszt*- /3lj5cbhll directions 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 / x:d:w) u+hq5 8gbr6lcamdamof power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from the doab)86 cqa+x r/ l:mwdd:m5h ugg?

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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.rj -jg3b/ l6kpp9e- oo00 m from a barking dog. What would be the intensity level if two identical dogs very close to ea jeg3pk9jr6-l/bo o- pch 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 thfgzs t* 10.rb9 ho4vq1kjx-e ae intensity level is 60 dB. What is the intensit h.4vr-0o1t 1s 9zbkefgq*jx ay level (in dB) 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. gw ryfvx,mpz.pzu2o4m86c+9f96ys e At what distance will iyum9.4vpwm2 r fe9f,6zc+ zxygs8op 6t 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. What bj0lip*u* ff*is the frequ b f*iplj*uf*0ency 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 zu3og1hl+*g j Hz. What is the length of the * uo3gzjg1+h lpipe?

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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 an2 4my9pg uug4y open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will res4puyg4 g9uym 2onate 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. If86zab,ot (dwlqcbdan4qp/ )y8(0ogc the velocity of sound in air is 340 m/s, what is the frequa0gd4,cto(db b8 (q z6ql cop/ayn8 w)ency 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 p il5o8q+xafi-rs9j;ni j :p2in a room 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 pr.i 5w y4 kt/5:xbgejlipe closed at one end is 330 Hz. What is the frequency of thxblrty. kj w4/5e 5gi:e 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 cloc0mq (mx,o g(d.p7aot sed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound is 340 m/s?7 mo0 mgap,((d.txqc o

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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 isubu 5zvz rw9e9gzp g /durzq**669eq3 in 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 where the temperat p 53a+(0 gtkyxxam*pkure 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 speed of sound in a88 jtl(l3 hit cu(dvl1ir is 340 m/s. Whad(jtli8(u 8 c1l3t hvlt 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 other is close0 u0k4up nz/gfgn28lnd on one end. If the fundamental 0g/znkf28p4n0nlg uu 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 in air where the velocitvi40yym)kft9v 5; tce+ v u:ygy of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in front of the sour m 4 ut0c+f;vvtvygy ik)y:e95ces 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 ant 73ecuf;.(ga lx (uvhd 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, .;tuch 73lg(fue(xv awhich 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 444 Hz. What is the beat frequency nvu 8tau/myz5dz: 6 2w:hj;ze?

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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 th j v) yzcfm (z;vm0yhyqf5m 4rz7-2-oce frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is thyc-(oq c5)m-j zf; vv z2 zrhm07f4ymye 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 prodl2fl5 */ )v c1oqowdvouced by two horns are 6 m and 7 m respectively./5v o fool*1dw)c lv2q What beat frequency is heard when the horns are sounded 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 violin strings on twoefe s 7 roz,m/ s-f;)6iszhhq9 violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage changeez ;sshs 6 hzq-i7m)/e,frf o9 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 mt/-gln(/q-5tp nouc-Hz sound source at twice the speed of sound. The observer hears a fq /nu5oc--g/t l mt(pnrequency 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 hioy+er-: 4:ew8 j aee1000 Hz) approaches a stationary observer at one-half the sw+-rahiee4 :ej:e y8opeed 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 off6nzxxr++k2 a; je r3-n *msyb 30 m/s away from the source, what is the frj 3x6r z;b 2rsk+*xyf-annem+equency 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 st,9vnp r,3 /g*-hprrg(tbapgiren. 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 roadside. What change of frequency does the vh/9(tn3 ,rgp,prgaptg- *rbobserver 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 statwno k9f6fq;u+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 u6kf9w+ o;qnf 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 400atv:-:olofqkga+g 0 nzepy9)fm b-,3-Hz whistle. Takeea)o,:z fmfv:lg93 a -n+by q pg-ok0t 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. The train blow5su+7 d1vxy+rd*bd, f9 czz 6tdx k8vms its 400-Hz whistle. Take the speed of sound to bz6fc x1bd7uyd k85r vvs,dmx9+ d+ *tze 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. The sb*8 0)k3 hdpvcfx/eqvgg d3wc8(g g,train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. Whatb,d f 88x)g( h p3gg/qvgsd0c*vwkc3e 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, an/xuloa4/ou:fm exi ( wj 1y8/rd you hear a tone of 400 Hz. Takeuxu fo41i(w :mo/y/8elraj/ x 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 train horn is 500 Hz. At8-icxy soey-mq 0s7-ssume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away fromc--oxeqs7-ms i yy80 t 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 speed of sound in air;4j fx)-gbtv a7y az:p is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speed of 30.0 m/: agbz4yv)j;7 pxt- afs?

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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 determinhbe j;9e vs1wm135+9elreell e the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is retlbj;1eml 93l w91ev5 se+ehreurned. 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 producedqzc4ba.9 w) cs 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-angle of the conical shoip0 n 7txtmu/ 2l2ir6tck wave /i 7 2rtn0iut mxp26tlformed?

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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 fcj6tnwi4 sne. o0xrp z5vh-jm o/68t5rom the United States to Europe with a Mach number of 1.05 where the air tempeer0 vj/om n st8hzt54.6i-6cnp xo5jwrature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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