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习题练习：Physics Unit12: Sound
本习题练习来源于题库网 (https://tiku.one)，是在线习题练习的打印版，您也可以访问本平台网站(https://tiku.one/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 70 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://tiku.one/test70.html
 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 fal8 d.c (xjy6ymkse 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 co(knzz9g4u 6 5xa7h ypcnducted fastest through

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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 s9-zby yh0e -kdcp87 txo mi*z81bzgc, teel 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 velocity of: bwgb4 eb04j*i*d3cci+duqp sound? (Assume that all other factors0gip c*eb*4:q3cbib jdwd 4+u 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,f .5)y(da x)srs(d e*slc+yp n the velocity of a 200 Hz sound through air ip5sd r y*yx +sa)(cnls. )def(s

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the waveazs9)-fj)f/nst a)c dlength of a 400 Hz sound, the wavelength of a 200 Hz sound in ai ftfaa)/js )nsz9 d)c-r 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 gre r(r6i-p+sfzm ater 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 are edajlc51v: 6x dbw9p db4al+,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 mdad4by kzdd*n6s 1a5*um 3 4gna io)h *hoh5+directions. If you move to a point twice as far away from the source, the frequency of theh1dn) hbmu*moadn+dh5 y6g 4dz5k4sa*a*o3i 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, intenyg 9)7wsse ,kmsity 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 disrf77u/lw:v i/f j+xb ztance d from the source is I. What is the intensity at a distance 2d from the source+i:fb7 w7vuxl / rj/fz?

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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 radiatinr7.vr ,yww8b0mgw ,r gg equally in all directions. What happens to the intensity of the sound? It redwg 0w ry7g,b m.r,v8wruces 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 h2d; k6r 3zyazis radiating equally in all directions. What happens to the intensitya k;h3 drz62zy 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 :(1*d.cd upz by- -qacft:dwu:o,dy eas 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. zp.;l6r1lzsd What characteristic of the sounlr1l6zp.s d; zd increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudn5y:u/pn njm w(ess" 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 "pitch" of akxe*17tco+ :2mz x -x3o6snlojznzi 2 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 fro96ns9 p1/hz*ctuajac zm3 p59 xvj mc(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 displach e(y+*tofri:7w5n; xjl9 4f( vvnnqk 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 standin.0inw y 3nlferzh12x* g wave on a guitar string and the sound wave generated by the guitar as a result o.0xhn f ri12n wly3ze*f 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 is open at becw9c 7zd8 +qpoth 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. Wxxoaiv ,d9mma0: nm-, if,tx93 ew) f(l9e qsghat are the wavelengths of the three lowest tones produced by this pigtx:lx(fi909ndx-mm,viws 9,fae,qa 3e )mope?

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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 resw7dk;1 jxj5n yonate in an open pipe of length L is 200 Hz. Which one of the f j17;w5yxk jdnollowing 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 fubj5 b(8je*bkf *ekw4o ndamental frequency. Which statement is corre 8bw*bej(5*fkko4ebjct?

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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 at theep++dkbt7 3 e;5pm1psunn4 l w 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:*el j;,b;lk0jym y eq*au b:r lowest tones produced by this pip*l m:b;qau:eyrjbl,y;0j *k e e?

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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 gu2m+rac4yire 3p3b: Hz. Which of the following frequencies w rg4i+23eamr bu 3yp:cill 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 resonati(i) qs,. uvof3v;7 hf/aj sefpng at its fundamental frequency. Which statement isff uh/ ,7.3qvj)aipf vos(se; 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 spe6zx(rf xl 3ot,akers driven by the same source. Each speaker produces a tone with a frequency o ,zx( o3trxlf6f 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, io*- ny5oryl-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 sounded together and a partikud47siu lg5 st5 81ghcular beat frequency is heard. What happens to the beat frequency if the frequency of one of the toness8475 tsggku il5u 1dh 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*;3 x2iclvv0y 4ya noh

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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 staq:m *sxv+q noz/-wjs9tionary observer. The frequency heard by the observer iw+j*s:-o/msnzqx qv9 s

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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 bd l0:-m.zt ymnch). nbuq-v0e y the obsz.tnbq.ecm 0uldy:hv-0m n -) erver 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 wilho 6l-h 6qy. x:w6mklcl decrease by a facto: w6ch mx-k.yqll6o 6hr 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 is 352 m/s. h3bq c5+c g:p)qshl+ ld: kkw/ruqx32 1;ounk What is the/qqk k urox+ )g:l2b+l13c d;hpkw hnqcsu :35 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 thp ie(g. p+6 gp70emt o9bynp1ce 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 sound in air is 340 m/s, a :7now ql*/mlfof5.l z bat emits a shriek whose echo l.ow 5:l7* fqzmlonf /reaches 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 tfpw4 04f zkb*whe 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, the distance to td.hsjx c,+l,e;er(+yusbaxv d lguvn(6/- : lhe lienv s.h/srcgl,ub( xu(lv+ :l6jx;,ya+ de d-ghtning 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 temperaturcp +o3,ll6xu)xe qh v02o s(yve 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 he9u wrjpb/+4* rim09v;l ulevt ar the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity o9 l0w urp+ r9*vitb 4vl/emj;uf 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 aire8mo;o+uyh 2f of 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 g2ndu9pi 98 xfat $23 \; ^{\circ}C$ 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 sound wssbvr 2v wu:3;ith 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 sood1m93xy dqz. * n2y/py 0wpish-u3 dfund?

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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 level;d r 6)g h o0so.7vqa50aeptpbheuf( -s of 70 dB a 0hdfso7rpe )6ab( oqpg50;th-uev. and 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 eqm1bgky.m00nr5ry k )ngines in a garage is 100 dB. What is the intensity level generated by one engine? r1m)0rknkbgy.my5q 0

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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 8fdv ezfc 5386k3uavuequally in all directions is e586vcud3u3vfak 8 fz
$6.0 \times 10^{-10} \; W/m^{2}$. 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 distt anue4j9yf d0 c61 ufxk41tr0ance of 6.0 m from a source that is radiating equally in al nkx6ufe 009 f41dr 4tujyat1cl 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 of power, which is assumed to be uniformlyujzebnk i97*ylm9;5 q distributed in all directions. What is the intensity level at a distance 5.00 m from the dog m9 7; zq9b*ynikul5ej?

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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 dmpy,c8)h++ apnxqhj jz. +5qb8 evez: B at a distance 5.00 m from a barking dog. What would be the int+avjp8y mhzb n5.+ ce),x qez:+p hq8jensity 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 int(kvwq5n -4 wtnensity level is 60 dB. What is the intensiqwn(kn v5tw4-ty 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 souw*v.- *iyv: 3czkbdrdrce is 95 dB. At what distance will itri**wkcdyzv-b dv3: . 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 r+y, xjqlqa 1wflpwy302d,q /1200 Hz. What is the frequency of t3q p /l+x,qfjaw 2lrwdyq, y01he 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 the lenlo);,cv ox0axd *gf zy:5sdn+gxz:gc5nvfo + o*yl0 ;sxda,d)th of 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 an open pipdzziep4 uxz+i;ny*8 tnl. ;j2 e of length L is 400 Hz. What is the frequ.x+8 du pi2y4jntzz* ;zlnei;ency 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 m. If the velocity of s*7/smrvpq/ q uoj/ kk,ound in air is 340 m/s, what ikkju/,/orp sqqm *v/ 7s 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 temperature +q)t i/dm:; j-yyqw pyis $20 \; ^{\circ}C$. 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. Wke vu* 2)rq/ushat is the frequency of the thirrs*)/uu vq e2kd 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 2j:02l:gk p(ttw xaqa pipe closed on one end that will have a fundamental frequency of 60:xqt at 22:aw(lkgp0j 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 temperaturlerb9l(1k gf7e 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 temperature 0n kzg /ofkj 8+(yruu1is $20 \; ^{\circ}C$. 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 t w. bm1n3ml 1ny 1s*llym+ttr/8cscz 3he speed of sound in air is 340 m/s. What is tsct8m/b m c*nz t y l+ys1nlm1.3wl3r1he 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 am/tiw,g9 ,vhj.jyb, same length: one 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 clo9w av,bg ,jmjty /,i.hsed 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 veloci 8vv4wl2oquu. ty of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in front of the sourc.ovl 82uw4 vuqes 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 and driven by the same frequency of 500 Hz. o9/u34cplvc )c-qtg2mye)z zb(k+kn If the distance from a person 9lk-2 (o/m4 c)bcvkpn+q ct)u3 z ygzeto 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 frequencies of 440 Hz and 444 Hz. What is the beatt hpyq4++ y 53qhno2d(uerbx43 hpj u5 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 tunh3q d9yyx/czu+s (e/ming fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the instruy( 3 smq e/c9x+zud/hyment?

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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 respecti s.5 gh+vkv(wevely. What beat frequenc.5s vew (+vghky 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 two violins7rl8 .qx+sir g tln;+le3d 2n9xr.qrw 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 bring them to the same frequs.wxlr+q;9 q2e7+nrg83nlir. ltx rd ency?

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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 i4lo g*mr,ivlx+ fiu:2ol g30sound source at twice the speed of sound. The observer heio4g irl*uvofgxl ,m+il2: 03 ars 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 stationary obse-sdh pxe tn;,)rver at one-half the speed of sound. The observer -;nd,xst) ehphears 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 H14/hhtwyd .+oangu(d z. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? udn/yw d( + hoh.agt14 (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. ha+ wo)uul+o ; It is traveling at 35 m/s on a day when the speed of sound th+o; auolwhu) +rough air 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 stati6x -xvl+zvob ,yq.av/onary 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 is 340 m/svqb-v6.x x ol,azvy+/ .

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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 atug8plbyr+q d;*/f h,fm48 wod 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you he4wfg; d y 8/8h+lod fbmr,uq*par?

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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 station-65 ua/fhaifo ary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequenc fau6/io-a5fh y 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 ;w;vsg +1bpine5 xce2400-Hz whistle. Take the speed of sound to be 340 m/s. What i2pxc ;+1gwev ; ns5befrequency 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 g.0)0c xrnevb ,) o2ijhv8 txuat 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take tc0o02n8 ,btuvvir))xxj .h g ehe 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. Assume the speed of sound in ai+k (a wxpmj:. (onbrv(*2 wetir is 340 m/s. What is the frequency heard by an observer if the observbn .prwi(tm2*e+ v:wjxk(oa (er 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 500bncef 6ln75w8 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer b7w5nc e6 lnf8if 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 sent outr qusw3 7fw+8(wwxmx.j0/hh w, and a 42-kHz sig wx8w 3+j.(f0w wmuqswh/x rh7nal 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 supersonic aircrau .opc08pojk6ft 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 a b:l9kxe) 8,cp v14zo uwkj+fthe conical shock wave formedw+f:u1kb,zo9akx cl ) e4j8pv?

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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 thq6b4r,- cf(g94 e h k4wa tu2letdn1cjg:mwu6e United States to Europe with a Mach number of 1.05 where the air tem2qc4rlde nu-4ua9g tk,wjcgw6b (me:hf6t 4 1perature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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