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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 fygzggc56 ;x8w *wlp i.alse 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 thro b: ev3/nz2.nivus0k 1tzrl 4hugh

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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 stee*x3a2jufxozv o j1v5) l 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 us t) / 1glses)z k7w;hl*(mtwthe air increases, what happens to the velocity of sound? s ;g( ksts1 7/tll))w w*zmheu (Assume that 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, thb+05:uw 0zil lqswnnbd g:rb7m n50p*e velocity of a 200 Hz sound througblp 0bd5u: zg+rnw:0w n n 5msbq*7i0lh air 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 400fr..fav6zutej3t 7k0 Hz sound, the wavelength of a 200 Hz sound in0k6 veaft 7 uf..r3zjt 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 frequencies greater than 20,000 Hz 7ij.ob llvi-wj+r8: ware 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 H nc(b9kn*z;f*fkjy31jj9 y hrz 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 in all directions. If 1 iph:1nbsuvi6zvl98 you move to a poinnuii11zp 8 b9l vvh:6st twice as far 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 is propqg;yo t) 77sv 55yeypportional 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 d from the sour.nwh*q 17 )xmwnfoob 4*(wj uxce is I. What is the intensity at a distance 2doww b* 4m(hqx un7nfx w*jo.)1 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 distance9m;:mmo bn+i f from a sound source that is radiating equally in all directions. What happens to the intensity of tm mfi9mb n;:o+he 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 equall ff1y)jgrq zs)fna+,/y in all directions. What hapzgfr,qf/n fyas+1j) )pens 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 increasho4d 0 4vp) 9:mqxtyttp *a-cges as a 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 speak49.9sff iyj )-ldjb/5ljx*0 d 8bvohkuqy4wt er emitting a pure tone. What characteristic of the sound increases?hiuyfd).*s9bo4 8/d4f x-vjjwq ly t905jlkb

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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 musicj+g0frmq. vo1n ,;gpoga*w:( r+ bnn fal 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" o1wxv n6aj.u:vceheu :04+opf f 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 frot zaema*+ e.b4m 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 displac kjt gmi e9x2,v6a6kdm ct79smv;y.n1 ement 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 wahez5m8 fp4u82 fnwik*ve on a guitar string and the sound wave generated by the guitar as a result of this vibration. What do these tpnfhefiu8wz 8 42 5km*wo 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 ends, thk6,()cgi mxrv ere

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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 a,4y h3inb48natr hc6 h 2jbu8are the wavelengths of the three lowest tonh,yr4c2ta8n6hbu84 inba3 jhes 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 pip:/qds5v btte :e of length L is 200 Hz. Which one of the following frequencies will not resonate in the same pipeq t b:d/evst5:?

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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 vkhjbgi1g n) r j/*35(e4jqn xfrequency. Which statement is correr3b*n ik5jx1e/gnv)j(qhg4 jct?

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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 skw2jo+);sb 89w dfezmfbiiun;1 3c6 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 three lowesko30m7 n ie3rx g6ewe5t tones produced by this pi3ie3me7r xok5n 6w0egpe?

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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 cjod1u rp2;-z 200 Hz. Which of the followingr2jp d ;czou1- 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 endl)nw/nim q-q-/v jp;iqfxi59 w1 mq1s is resonating at its fundamental frequency. Which iilq q s-q-nm vjm5//;qp1fi9 1xwwn)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 speake,94l)u uxt vy ubrn2je8f.7i lrs driven by the same source. Each speaker produces a tone with a frequency of 200 Hzebux 8l,j uu. lyr)7 2t4v9nif 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, thehtpcoj+ j5xol9bk9q qn9rl. lb(z+ /, 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 sounded together and a particular beat freq u;,7:k,grjvvlwx+kb uency is heard. What happens to the beat frequency if the frequency of one of the tones is increas:lb+gw;k vvr ku ,j,7xed?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift exj1 wi/vi +)ibz)1pw+5cwmmc bplains

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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 frequen *rf,xu)s(+ x xwlsy+wcy heard by the obser+yw ulxxw ss)r,x*+f(ver 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 by 0o, gu 3n5m vkw*lw.tdthe observerlwu d5n *k.m0gw,3 ovt 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 d0,+7umv-ktq yumox l( ouble its MACH-speed, its half-angle will decrease by a factor ofk+vy (t7uu0mx -q,olm :

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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 ai,x4-, z*h eq ur f6rsfmtvy0c1r is 352 m/s. What is,y06m1ves4ruf,xqtz* r h f-c the 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 sounqv5qv r ) kko;pry74 vmq ayion4*e35 qg:4-ycd 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 spsujqk4dyu,c 3* *xfuo1fjkt :e x,. i*eed of sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflectej:ikec 3*4 o,*udutf*j ,xu qk1s.fyxd 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, )0bs z-e)(+sx11qij irbitfgand hear the echo 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, th zdp*ij5szbtv3o m .3;e distance to the jov33z*;s ti5zd mpb. 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 cubjf3a,q9lx 8g e r3o0au*b 0from 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 the sp( o6q9 r l3tcnghwoiz t:1tz3 mdey33/lash 2.5 s later. How deep is the w 9e:w3m /z 3 z(glcqodyhi3o1n3t6rttell? (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 spl qciv)z z.vk*f(a;1 ound 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 ah4h ec02n;nz sy/m2n$23 \; ^{\circ}C$ 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 intensityz,(dsk l hx,e35yaa ek7 1wfp0 level 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 of a 70-dB :rxewzsguf;n5y/+uce(9a2 r 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 fobgn 56h+hq q s7+ f jz1gb/*yvn4no7fo/ i:vintensity levels of 70 dB and 40 ngn5v /*sb +:jvzf7no7o1i 4h q6h/fgy ob+qfdB?

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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 engin+ gar*hi-/.mbw foa -q7n3h ahhu-r7oes in a garage is 100 dB. What is the intensity level generated b+qw f--7a/.rh3ubr ni a-hhh m*o 7agoy 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 radiati 9n(:vctoam1f kq7p k9ccoj :)ng equally in all directions1:c(c k:t) vmqkopj9a n9 fo7c 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 fru5,p s8 mfjpcq.y 2a 7.wrme4gom a source that is radiating equally in all directions isgsq2j 5.upycmr 78aw,mf 4.ep
$6.0 \times 10^{-10} \; W/m^{2}$. 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 un )rsjqqnx(1o +iformly distributed in all directions. What is the intensity lever 1)qj(nxqs+o l 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 from a bauw bdl9 u2g f3y,-4lsgwm52uorking dog. What would be3u by9w2 fglu,o l4mws5g-d2u the intensity level 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 inten5b;tu:* +rvrfsg ::)x7da j osm+p ounsity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equally in all dirr:a:+ ugsfj 7n5 br)uo ;mp*v:sxod+tections.

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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 fo, a6yfiq g+j5rom a point source is 95 dB. At what distance 6 jqigao yf5,+will 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 tone has a frequency of 1200 Hz. What is theua 1;xsj(l -wm frequency of the fomawu;1 jlx- (surth 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--u es5zahl xd*u9 wk8 900 Hz. What is the length of-5k hdeaw zuxs89-*u l 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 resonapnow,f-)mf4 +v fu ypp51 me*jte in an open pipe of length L is 400 Hz. What is the frequency 1-pw)4n,5 eymp* uf+fjmov pfof the lowest 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 l2 9pks i06t t/kfb5yjsength of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the secopiyskt0jf/5tk6s9b 2 nd 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 m gg5e5t6az,n5bxj1snk7bl 6room 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 freque vuwrxrb1,. a(rig,3v d+3lax ncy in a pipe closed at one end is 330 Hz. What is the frequency of the third harm .ra+uw (rr, 3vav1gdx3b lx,ionic?

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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 pvbroqi u--x exy(;.z 23ro1w pipe closed on one end that will have a fundamental frequency of 60 Hz on a day wheuio3-w2v r;bpox q(-1zr y. xen 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 ab+(i2(zj 5 fj;uxn zaj 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 wrt6u1w aza8 +there 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 whenqg5v6yy,7 z hx9q i88 mbxu1)p w/wdnu the speed of sound in air is 340 m/s. What is the fu7)hxiq58xqywpm /8,b un1wv9 g6d uzyndamental 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 closed on one;92bmy7 a5 -ldesn9o3 -qa:cl0ll vrm2yf nee end. If the fundamental frequency of the open pipe is 300 Hz, wh;ar7 qym5fym-2el-la09b e9 e lcslnvd:3o 2nat 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 ir 1rnu3pkdh*-qs /j /6nx2g hen 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 wouldpq3hk u-rxg2 *nd6r/sje / nh1 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 H.yeqi+i ql )(cz. 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 to the otheei .c)+(qqlyi r 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. Whalb 1*c2 gks;xat 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 am) 7uhas r7n)cynnms -rlb*78 550-Hz tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat freq 8snrnc7-*7 m)nlhy)7bmsa r uuency 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 sounds produced by two horns are 6 m and 7 m respei j+nkn n d 3u4q/f.-oifiwq3-ctively. What beat frequency isj4 w3f ufk-i3idqo/n +q.n -in 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 two violins in an orchestra are adwk4he.4w c 8found 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 same frequency?kchdw4. e48wa

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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 s3q q, iogtb4 +*he-uqdt6*gsnpeed of sound. The ob6 +eqosq,u43-*gdqg*ttb n h iserver 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) appronk yl3;mef 9.oaches a stationary observer at one-half the speed of sound. y .;l3fe m9konThe 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 li3/8 qb 2qqcsun13 zzslstener moves with a speed of 30 m/s away from the source, what is the frequency he s8qusb3213 nzcqzlq/ard 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 3 /v jr .a3wkxd3bbs3 h3h5arq15 m/s on a day when the speed of sound through davr s1.khj a qbrxh3533 3w/bair 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 stationary observer when a train approached .(cnmdmqm*vs(g 3q 9s with a speed of 30 m 3mvmq( dqngdc9(* sm./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 a,gbjbubd 7rgm4 r3.-c 4hbxvq4 )o-k zt 120 km/h. The train blows its 400-Hz whistle. Take the sper x4dor-3b q,bg- ku 4bh)jvb74cz.gmed 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 trai tew- dx3- 4mxn-b1fpyn. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequey-x13m-fxdp b t4wne-ncy 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 127:w 3 .wmd by;)kykguq0 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What f y ;wq. byd:gum73wkk)requency 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 cyxi*qymf / gs,u9(g/ 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 frgcmf(ux /i/ *qg9ysy,equency 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 sound nrjtb 5cm /hahz s,3()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 speed ofzam cs5n jb/),hht3r( 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 au 4kjef2e 4 55;hjqgvs:rp o ift*s+/lir is 340 m/s. What is the frequency heard by5 sioj e :tpf2eus*4h5kf4;r gq/v+l j 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-kHzzfw iji )e6y:- signal is sent out, :iz j -f6yw)ieand a 42-kHz signal is returned. 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 xdbli0, r2c j*shock wave produced 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 hz+ cuyhy4m hbd; v3o9:alf-angle of the conical shock wab+y4mc ;oyv3hh:u9z dve 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 gognq.9e e0kyk0rwdt-nsr j9v 5)a( .United States to Europe with a Mach number of 1.05 where the aiqy950og snn)e g dk90(err. -vwa t.jkr temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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