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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 false22r2g pq.j nuaec57p)1dg 8t sha *org 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 thrxt mkq+3(cdb8ough

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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; se4:qofe q ups9zun.0.v s;rl 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 aief; xjz: y 9 **fz:3ypuahi;ldr increases, what happens to the velocity of sound? (Assume that all other factors remain cyluz i;e9xy*hzff*p; a ::3djonstant.)

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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 efsbl/r9e(59q6j qom200 Hz sound through air ijs 5e(b6oq/elm9q9 frs

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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 b.5e .o ,;u8noxv c 5gzmfh,vg400 Hz sound, the wavelength of a 200 Hz sound i ec ;,.uo8 xgvf,n.z5b vmgho5n 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 xj1.sfr* c hc(frequencies 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 Hz a p1a)iqd9f -gxre 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 unif k 2/kyu +k-qlrvwrh)9ormly in all directions. If you move to a point twice as far away fk uy+kql/9hw-r 2v)kr rom 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 fy*jxukh ,c:eh-e54i fya 86vproportional 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 source is k/0bf0cc5gkk-gn x6 dI. What is the intensn0/c k5 d6 kgkbcg0-fxity 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 from a sound source that is radiatix*356 gns9ke ;hrl piqg7c d4vng equally in all directions. What happens to the intensity of the sound? It reduce73c49pegn lkdhv xq;65s rgi* s 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 fry ,, e4l6 wh++pq1cuf5pzfxneom a sound source that is radiating equally in all directions. What happens to the intensity level of the sound? It d yq++xe ,6n,145 wu effpphlzcrops 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 followi a 9iw vwf lrqpdf1.hba4-.62lng increases 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 speaker emitting a pure tone. What characteristic k hzg4gs9vm --. t3btvof thet4z9mg tvhb-3-.ks gv sound 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 musia v.*)uu(t6p 7z uonhzcal 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 "p i87h0g-*p h;z*+thwd rw irmwitch" 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 fromm9ur9(p wgy6c 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 displacem6k6g4lx6 y w6 w1wlosjent 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 bmbj /zlpo-8842( ilfr ghk8*zj gkwy:y the guitar as h-o:w8jyklk8 zb2(/grfp*4igmj z8la 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 isx/w6l. cy q4ubkn9rm,*qr.qw 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 skse)4c+( gmmi bkj(y 3k+ fpr(im22cL. What are the wavelengths of the three lowest tones produced by this3pkr mj+c(ksi22si(bc4+m( e fmkgy) 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 +mx3cpxqh mdhc*vl4.y r+ a*9 one of the following frequencies wil al+c**vyxhmmch 49+rxd 3.pql 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 e7;;efy2u whq-l ,qj3 u2idppat its fundamental frequency. Which statement i3 - d;yw,fe2 p7uqp2uijh;q els 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 and closf /dhcv.t53fved 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 889lybosx2i1y me8 cilowest tones produced 1x8iy8oy 9c bim2s8el 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 closed pipe of length L is 202r:c)32t wohpwn-pt- hervxue1 jr7 +0 Hz. Which of the following frequencies wvtnw o :r ere-hux)pj1 w3-c2+rht7p2 ill 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 or6e. :ly,96h *t5mgzylkot efrequency. Which statg :y l y*5,zor.ke66mo9h tlteement 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 t;o5b pjpu8r p3yl/: zwwo speakers driven by the same source. Each speaker produces a tone with a frequenorw z ;p ypbu:/p8lj35cy of 200 Hz 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, the two sound waves s)h.,jvqq *;zxnu yn0qhould 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 par3j22 zkb wqc*fticular beat frequency is heard. What2f b*z qj32wck happens to the beat 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 explains,hu hsl(wks+661vbks

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source appro2 g+-f4gei7akl471 19zm 4anrc8phsx k ocistaches a stationary observer. The frequency heard by the observer ig fk9 r+1c4k axo n-za8c12i l7s4itmeg7p4s hs

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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 +, n:odkvrvc u;8sxm) zx*;soa stationary observer. The frequency heard by the observern omxz*x;uc:sv8vd )o+k ,;rs 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 itsgf0b +vu3eh kjm 9w0z9 MACH-speed, its half-angle will decrease by a factorw0hbe fj 9u3vz+mgk 90 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 qk7 jhpo0l-o 05 n(hjpof frequency 45 kHz in air is 352 m/s. What is the air tempoqjp7nj5p h (ho0lk-0erature?

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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 7 /r9m/: bkd35jqpfbx) ,xhsl 1kjblfspeed 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 340 m/s, a bat emitsgm 29 x.qvei0bmsj:9w9 z1qfn a shriek whose echo re2qg0v x j1 9 iqn:msb9wf9z.meaches 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 svfu0ae7 kk/4 j. 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 dis 9z /eyn;e487pa6; f mcm,wnd ar2qcsstance to the lightning stcnc ;74yn fsap a2 q9sr ;/d86me,ewmzrike 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 clifbm03 w+id :i0vel3zx ef 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 intor gjy;me dl.,. a deep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sound is 3g y.,dr;mel.j 40 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 wae mcb, 0jpsu;a 7(fabdj.)a+vve 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,jq*rwthltsaw378h2fc w r) uq.r/t 0 $23 \; ^{\circ}C$ 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 levelrev n 2-idv7e6g:s7 ht 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-dqcz43wvw-7bn mnq64 pcf z5i:B 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 levels of 70 tly1g*z1gzmpgxx 5p) ut26x7dB and 40 d17 lxxt 125p x6z gyug*zmgpt)B?

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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 engiobv.1vi0,l0e1xq/ fmlvl+ * 2kyfg rbnes in a garage is 100 dB. What is the intensity level generated by one engin0klbv xb mv12+,o/0y.lvfle r fqi1 *ge?

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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 o:g4v5 w+0jw;glx(jvjrz6 t za source that is radiating equally in aj:j vxo5gwtr+4gwzl(;60 zjvll 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 source that is radiatingvj)sm8aukot (e1 5tl; equally in all directiona tsvuom() t1 k;e5j8ls 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 uniformly dijvnb6y3:jci +i w,l0 ua2ej beo:6gv5stributed in all directions. What is the intensity level at a disevbl3o0j6gbvnu:iy j:+a 5 ijc62,wetance 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 dieyv:bzko,lo/gat05j ,c+ s5no f kgvq94t8 i0stance 5.00 m from a barking dog. What would be the intensity level if two i ,b o o lk /58vz9ka0+oef5ygt:q,0nv4s jcgtidentical 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 inafza9vl1 65/sbvtp r4tensity 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 alrv/sb56zf4a91 ptvl a l 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 le8rb9 5c jv *c2 enzc+c w6j8iplpfi4/evel 5.0 m from a point source is 95 dB. At what distance will iccbzwv 2*88p /l ri4ej nc6ce5fp9 ji+t 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 c9dau9x1m-ki u omplex tone has a frequency of 1200 Hz. What is the frequency of thuk99-iadx 1m ue 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 h ;k78k2v itnmthe length otm hn ;k278ikvf 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 wp+ y8du hv-o:2 hov,ain an open pipe of length L is 400 Hz. What is the frequency yvav, o-8u:ohd2p+wh of 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 6;/p54.cuquoa ae7r /jvxewt length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency ofe7;vx5uqwaa4j6/ oer .tucp/ 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 roh3uv4b vl45on om 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.z4 dnaz e+bf2 one end is 330 Hz. What is the frequency of the third harmondze z. 4a2+fbnic?

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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 willrk,k 8wb (zxzy ;*1im ik+:zno have a fundamezb:k;x 18m,nz*+zkorwk y( iintal 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 tem (8 n+dg5kv+h50ygeqsj fo7t xperature 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 wherej e)ibj6 o e8n l9pdc7ay1z;z; 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 speml 02q, vakmt,ed of sound in air is 340 m/s. What is t2, ml0tk, vqmahe 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 closed ,ibn1(nzc.bl on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequeznlnb, . bi1c(ncy 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 evu:9u0wnrhnic-:mzw c+i: nf 4y1vt)ach emit a frequency of 800 Hz in air where the velocity of souw)+i9r 1c:i c:0vwn nuf ty4hmnvu- :znd is 340 m/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 placedw3uhbvtx; m5mh,u*q/ lc3+grp/d y3d 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 possible the distance from the person to the other speaker? (*m;3 dqlmyw/5,b3hh3 p+cux tr u /vdgThe 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 6*/v x*(4 c2kepdzgdcluo e9cis 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 .if-fz2z2q0s uq7iwhet vux y(3ej9 + fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of tfjhu(2.0xv 3tsw-qe yi 7u 9iezzf2q+he 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 m7j,emwg4l : 6nc eq7ta respectively. What beat frequency is heard when 7m t 7ncjaee4q, :wgl6the 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 s )wr9( xvyya/3ze+nk orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is player+v (ns /3aw9 y)ykzxed. What 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 tcp gl(;iepyj(v;d::+*ai g:u4re cd sound source at twice the speed of sound. The observer hears a frequency oy;cd c:vgup4d:+g pa*t e:(e(;r ijlif

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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 stationary observer atnhm6 j)d 0j8o b0 m6*f,lsmlhhpx(h o9lo1z+ v one-half the sob,d f8 9 sl+10 z*)hohx0 jm(p lnhvj6lhom6mpeed 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 li(ne2mf+rmq k 5stener moves with a speed of 30 m/s away from the source, what is the frequency he+n f25m(er mqkard 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.bp3 rh:e4 i*dbqc+ -gi 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 observebhgi-*b: e+q4i pdc3r r 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 observ 24oicqae70)nxwi0w her when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of i i)0 2ncaxo7hweq04w 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 12bj3vr4.t j 6elde31c. fk c3ow0 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s.jfd133tve6.bwe jc.o4c rkl3 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 blows its 400- 0s;kxp nipo:*Hz whistle. Take the speed of sound to be 340 m/s. What frequency do yo pinx;kps 0*o:u 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 its 400-Hz whim/sp/) e6pq).o 8cyoq/h c atustle. Take the speed of sound to be 340 t) q6/ soq/pyepmcuc o./a)h8m/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 wh8 ;8g9rdn bp7k qdr6l ekz6t.histle, and you hear a tone ot8r7hz.qeg l 96p kb 6k8d;drnf 400 Hz. Take 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. Assumepwqsh +*-vodj)g7m 5 rs3ftf) the speed of sound in air is 340 m/s. What is thet3 dm+vow*rp)hfqf-s75)s jg frequency heard by an observer if the observer is 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 500 Hz. Assume the speed of sound in air ibwj yh:35boa,-,r rt;w ahbx1zlj -u 5s 340 m/s. What is the frequency heard by an observer if the observer is approa5bwjx-bl1,ra y-t,b w 35 zh:aor;uhjching 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 sig 6 -gpm+lp9m 3xvndos)nal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the object movis3+v6mpdm gl)9 -opxn ng?

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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 producv1ep:( rt )s*1xcfmyg ed 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 ofd wf/+(+csil(l1nzg:ix fdu2 Mach 1.4. What is the half-angle of the conical shock wavi+/us:l xg+ zi l2nfdd (c1w(fe 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 flieape2t, blk +j1;), dtwaci0ycs from the United States to Europe with a Mach number of 1.05 where the air temperatp1 ;)lkdaj ct,i+ywe,2actb0ure is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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