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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 statementeg 7 (;k0cvo 1ai+pp,df e-yfs?

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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 throughs5 6d9ykvarx2

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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 pp ru te*kf8dp2em xzy +4:6faku t67.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 ha gc +o;lgksnq570ygq-ppens to the velocity of sound? (Assume that all other fa 5+ggy0q;q -gkcslon7 ctors 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 velov5l /wa8 b(aokcity of a 200 Hz sound through (lkw5abo8 a/vair 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 wavelength of a 20y i/q;n svd ;:mndk(0j0 Hz sound in (v d/:;nmnys;i jkd0q 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 52d*a h9po+w3 negdvegreater 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 thiz sel/zc46s3knx ; +qan 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 hp r8x 5q:g.7acuub, hg5yga9is emitting waves uniformly in all directions. If yoqhh7 gg:5a py.uxr9 cag u8,b5u move to a point 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, inte4:px5ql0j,ao2 xs*vyp- ysegnsity 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 distance d fzs:ruhmlht6 h42e+tlr19+1j z. q ehfrom the source is I. What is the intensity at a distance 2d from 9 mts2++t11.ezhjul lhe4hqh: rz6rf 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 evvml/z,r e2 fg x(v,k(+sv 08rhws6ibqually in all directions. What happens to the intensity of the soklsbw( r8r6hgivxs2z/( +,vfv ,me0vund? 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 radiatingima7htcp81lw 4 1p cw, equally in all directions. What happens to the intensity level of the sound? wcha m17c8p p4,tw1i lIt 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 )z d 6t o4 k;hx/ffvm)ky-n9pesound 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 charaf1 f- :sy if u 38al07prrmd;i5q0zpfrcteristic of the sf fr7z0:8d-i3; i0a5rf sq u1prlmpfyound increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loux .,; t6cbbmpidness" of a 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 mpouqip6 g p-b*n d04y:pl:r4 "pitch" 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 inpyr fr:97/h yt:cgf c(to water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacemenuk 6q u- e5k*f*zvn8w1le yz4nt 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 generanjtn r6 4oj.pbjp zvzc)y.l ;4: )jrzji19ok(ted by the guitar as ay.j1z 6tb4 p;zo roj klj(i4 nrjv .):9njzpc) 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 6me gx5u/ v wcwjg;k10which is 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 the wavelengths of the three l;a/ o4mc45shys xrs9d owest tones produced by this pipe ;/x9oy hmcs4s4sd5 ar?

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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 resonatpi3l9 s d7(x p6y ohad9jyt:0fe in an open pipe of length L is 200 Hz. Which one of the following frequencies will not resyas:x7d0ltd( p fh 6i 9yj3op9onate 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 re)wr y.5wb pdi9sonating at its fundamental frequency. Which statement is correcy.ip9w b)drw 5t?

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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 j) (h .oku8qct9 e.fxuat one 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 areaqqhhj3 t8 w-(2tyuwu-h agh9f:h*+m the wavelengths of the three lowest tones prody8w9 2q hmtw-(*+ghj hu: tf h-uhq3aauced 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 200 Hz. Which h)ttca6 *r2tm of the following frequencie rmt* )tc6at2hs 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 fundamenta8-jsny35 n8ao pr,ovt+rjan 8l frequency. Which statement is cor nn8j pny,j vaa5+s-or 8tor83rect?

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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. Each spe(-obq8/a ubvuc1p 5bqaker produces a tone with a frequency of 200 Hz on u b (1cbu/o-q8bqap5 va 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 should hav78zw)k4;qcxevfu ya 4e

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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 soundeouk 192t p6ibpd together and a particular beat frequency is heard. What happens to the beat frequency if the frequency of onek p6pt1o9biu2 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 explainss sqch. f)oi6;bz0ww)

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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 fre/ 20e hjr *px5dliy w2. ;mrxp(lxfx;nquency heard by the observeryexp(jf*/2;ln xwp;m idr5x2lhx0r. 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 +w .8yhi: uuz5w . kayp1-- codrba0wjheard by the observer isdw a5puc- a-r+0 w1w:kyb h.ujo yz.i8

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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, t)p 8a 5r;qagd-jeeqk) :;ftvits half-angle will decrease by a factor of e);-edt)k; var 58ptgf q:qaj:

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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 is 352 m/dr pkmp..1z q-y b:e0z:hgc8 cs. What is the air temperatureg1 .czzb0-ydrhk.::8me ppqc ?

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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 speekx uaw/h7 7/ocvu(zz omuo) 7,05rroqd 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 inpwe 3n3,9o cq2izjl7d 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 reflected balq,io dpc jn32e93zw7 ck 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 temperature ispwbns(, ; xl +vn)hjq7xih8 c. $0 \; ^{\circ}C$. 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:j ;h7zz;rvz6w )xk c0cfg-r c, the distance to the gvfzkz c: c r-c;6;0zxr7w )jhlightning 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-kmezv-- mw8 e 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 splash 2.5 s later. How deep is mclui+cdimd7 7 v08p8the well? (Ignore air resistance, andd civ087m8+m7d l uicp 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 ssg7 m m e8-enwd+ 2re.4,tvezround 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 aircs)os )1 1wp:jt5upa sv(1csx 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 leve6 sa0w/ .0i/kbsbg+5xua yavkl 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 owlmh4:8sf wa -0xfgv ;f 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 intensities of two sounds with intensity l ow:dh1rg6k2jevels of 70 dB ankwh2odj6g1r :d 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 71ym94ehqbcia74 or q oeq--nud af58a garage is 100 dB. What is the intensity level generated by one engine?obqae y 5don ic qef-ua1-4rm77q49 8h

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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 source3 ti/6ckut/dk;d4b lcie:; vk that is radiating equally in all directions is;:cidu v/cit46 kbktkle3/ ;d
$6.0 \times 10^{-10} \; W/m^{2}$. 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 6.0jemm hg,1m3ra78ws /z, sbjy/ m from a source that is radiating equally in all directions i1g3jm/bh,ms zwsj8/ ye,a r7ms
$6.0 \times 10^{-10} \; W/m^{2}$. 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 power9rqlrkm:/e/5j e 6x nr7:lbx 2agt9nl, which is assumed to be uniformly distri7r6 eb/j9e: lr xgma x: l5tnkl/9r2nqbuted in all directions. What is the intensity level 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 f8k) e.nxjv sy spx7q5udv/f02rom a barking dog. What would be the intensity level if two identical dogs5ev/d02 ps)8jfx7qvx us. nyk 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 thew( 5, )kdsjn0zsc /grt intensity 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 directions.ds0zrsk5 jwnt, (c /)g

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The sound intensity levyc 3 *mrjp.y1zel 5.0 m from a point source is 95 dB. At what distance wilpr*1y3mz.jc yl 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 frdt *3k2/pa bg4oyb)of 1200 Hz. What is the frequency ofba/by) 3r d*t24fpgko 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. W.erzi8+ hxge2hat is the length of the pipe i2g.e hrzx+8e?

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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 an open pipe of length L is 400 Hz.ayas-lt 4)gpp 0 o+i;ydr 6ow9 What is the freqsl+or d0gpt4y6w;yoap9 i-)a uency 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 length of 0.80 ,m9tsz fed9ge/ hsa m56 *6tulm. If the velocity of sound in air is 340 m/s, what is the frequency of the /6zhtldm5t*,sf9e ms 6 e gu9asecond 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 - dj;bq4 l*x+m596heptdi cim:o- wv fthe 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 330 Hz. What is tnxosiht4 -9 ;d y-w6gahe frequency of the third harmonic-dgs46wot y -axn 9i;h?

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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 cloo+4p cgc ,/av(wh9 zxksed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity (a4 cczpoxhw+g k9 v/,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 temperature is5bt ++4skcih s a:qh;s $20 \; ^{\circ}C$. 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 wy41ai:vq00xr;gyz t w here 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 p qj.svdmy ff2*p1- 5:i rl59wbchx2km is played when the speed of sound in air is 340 m/s. What is the fundamental freque2 :cjp.ldrxi-v f m95q1s2fk*wp5yb hncy?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two pipes ofela0: pvy y; c vvom6d28u3(c-qmh w7v the same length: one is open and the other is closed on one end. If the fundamental frequencyd amp e 03v67yvvhy:l-(qu8 cwvo;mc 2 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 v9tj+) a 2lv lq:a.*;ql+/gcs flpnclair where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an obsec alvs+9 cl tv)alpj l+qq/f:;ng* l.2rver 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 a+mt(.+ f v*z0jmtjayd+t:r xside by side and driven by the same frequency of 500 Hz. If the distance from a p. ajd++ytxm (0 ftz*r t+:mavjerson 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 frequew9 0:n hmcnzq-ncies 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 the 9cl+v n h5nb u2 emae,v1sm,mb*l:8kmfrequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of a1vk+ m ,b,2sc5mn9mhl8en*vlm:e u bthe 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 souael 2l o,gmf*9nds produced by two horns are 6 m and 7 m respectively. Weg2m* 9a,ollfhat 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 violin5.o mdnujl,kn7x *:t a 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 brin uon:5,dl .nx kjta*m7g 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 stationksf 98sb s l)9t4u wx9zx5um.cary 1000-Hz sound source at twice the speed of sound. The observer hears a k89x 9wts ufm.xus5s4l)z9bcfrequency 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 stationary obser .x*jf.hpu3jx x1) fx jq:rzm0ver at onxq rfxmxj) hjz*30f ..p1jxu:e-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 10 cf/gvh*e x,7-gfyu* 6qmxw+m00 Hz. If a listener moves with a speed of 30 m/s away from the source, what is thy,*wxc qv ggh*f+- u6fmx/m7ee 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-d ) xp8rxp6zb 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 frequenc -r b)8dpzxx6py 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 d-9bmaf4 phg9observer when a train approaches with a speed of 30 m/s. The frequency of tma4dh9f9pb-g he 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 tr begcswe s2+(epuujj*3v.7 -hain blows its 400-Hz whistle. Take the speed of sounus sec72h(- ejp jw+gb*3u.ved 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 bz qlqi0uuh mtnlg9v. 5t8uhj0. s/;:blows its 400-Hz whistle. Take the speed of sound to be 340 8:ut5ni zs 00.lqh.vtul/ jqumbg9h; 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 train blows its 400-Hz w9h0yq52cvsn qq4 -uqp+r)ifr;-t ojrhistle. Take the speed of sound to be 340 mpu-;+y95qrvsq04ro2iq n) rq jchtf-/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.1/9gvf 0: xmp(d1ykbsmmxq6gwt y6;n 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 frequency oq6 gg/vb6 ymm(psn1mxd f1 0;ktxw9y:f 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 b( d4q ;u9 wyq.pam,tvin air is 340 m/sq ab(,dpmyq .vtu;9w4. What is the 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 asjlh8ad *06bx ir is 340 m/s. What dx h6sja8bl*0is 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 sent2 jb; inhpu q+.jrie s:d71ajacs9 /m7 out, and a 42-kHz;i:r a p72 b+n 9sm7dj.c qejja1u/sih 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 shock wave produced by a supeevvcv:1/ kyi4rsonic 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 1;- uitjkm vb 8fv6bhms.0h+7lwvuh)Mach 1.4. What is the half-angle of the conical shock wave forwkv ibus -v . m708+h;u hj6v1mhltf)bmed?

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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 Europe wj+p r(xkyx-:w s2w(hs ith a Mach number of 1.05 where (r -wwjsp+(hyx xks:2the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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