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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 falsv (g 5.:a/bafysqsq5we 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 c:bh fg01o 0htdtt2g;p hz /:lponducted 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 i+: u(, jsy;ee-dhup fmn 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, waxv/7nzrtb bs5a) s-+)kl 1xs hat happens to the velocity of sound? (Assumebxx)s)s+a1v s75t n/-lz kbra 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, the veltg5lv2y:w ag:+a j6g aocity of a 200 Hz sound throug2+lawga 6 j t:yag:5gvh 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 wavelen t*l:fsnn2 3g- u: wn zpprc2/uuf5no1gth of a 400 Hz sound, the wavelength of a 200 Hz sound in air is snft 1/ cuu2pz 2wnrpglf3*5 no:u-n:

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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 callem9;/y0tcug p ad

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequebe byp,5q ;vi3 2ikuz.ncy 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 unifu:5 6xn(k n*jll+yiw qormly in all directions. If you move to a p+ j*w xnql6ny5l uk(:ioint 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 proportional tsa j)p 96jyxr*) qusy6o

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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 poi4fca;fr )mz l-nt source at a distance d from the source is I. What is the intensity a f-claf mz4r;)t 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 tq8h vtuzn1v h4ntjg 5:fd1(+ohat is radiating equally in all directions. What happens to the intensity of the sound? It req h ufvt+4(1jdgz to:5vn 8nh1duces 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 thab 8g+yllr o.cqjjkw- d66dmk /y( 5h,jt is radiating equally in all directions. What lyb mgo, (5+d-k.w8rh6lyd jqc k j/6jhappens 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 increh(0 sa:rhp 0wux o-awwcm22d vv ru7+1ases 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. (j:mfx;p1dhy*1z h + jpejhq9 What characteristic of the sound incrq1p1jjhh*z jd:;pxef yh+9(meases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "louda /t*z)abo gvx140.sxmp+ uzuness" 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 a musical notefi -fwf(2fcj7 int*l2?

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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 , q4wks(* bdj z5dl6fpq32txj(u. tyyair 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 displacn,cqul jk8)3uzf) vd 0cdm :0sement 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 by :x,s-t 82srxp33b 3 rswdiwumvtm:5uthe guitar as a result of this vibration. W :u2mi8sp3ru :br , dstsmx3 wxv5-t3what 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 wh 9hzf2ql5m o5yich 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 wavelengthyo,kg p c.wo,:qpefeb;1,v4c s of the three lowest tones produced by this qoceev ,y b,,c1:p ; w.ogkp4fpipe?

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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 an7cnam 638purd open pipe of length L is 200 Hz. Which one of the following frequencies3a8c d6pu r7mn 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 resonatin.n6 f-*n1r xjh9dzhwy g at its fundamental frequency. Which statz .hn6n*hj9-x fy1 rdwement is 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 clk4r zp5i9xrvi ;w3hd (osed 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 t(j.8cek nl .bchree lowest tones produced by this pjb8.(kc celn. ipe?

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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 o27 .h+natu 0qlw- hcsif length L is 200 Hz. Which of the following frequenciqtc7.hh2aw + lnu0-ises 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 fundamental fl)yy -/sz 9i;gxz; yq4s(smq tfx;m8krequency. Which sts4k; )(mi zm/ s-yqxyylf;sqx89 ;tgzatement 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 cbga5wfms08: qjz: u1speakers driven by the same source. Each speaker produces a tone with a m w1jg8:cz ua:fsqb50 frequency 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 should have8dd gei;s emm, 43tej(

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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 s.sj j6r1d9ibj;a q(c dounded together and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of tds9j;( 1ca6 j idqr.bjhe 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 explaa f i0eq0/vu5ains

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approacl97 l29abz j*-wn(syb7 kzzh ahes a stationary observer. The frequency heard by the obserz 9*9b7jh7n -balw(zy2alsz kver 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 stan.6n , docuf:zd idmoy4l9)k4tionary observer. The frequency heard by the ob d)yn4kf.dl4 o,: dcm6 no9izuserver 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 decrik;h( nky(d-lw+ fd3m ease by a fact+ wkin3d-;( ylkmf( hdor 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 352ip;8w obt8 t;:xlzu q- m/s. What is t; ;pquzo :twbl- tx8i8he 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 soug /gz tof)vc:mbwc;ox1) r( -pnd 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 emits a shriej opi.kv1jqka+kkb 09 l-2cd6k whose echokcaq06k.+9ijvlkb-j p d2o1k 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 the echo i(v enl0tome0+ n 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 dis1k0t- *xdo mictance to the ligdt mkoi1 c-0x*htning 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 0 (1hcwuluu cda;w, p1a 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 splash 2.5 s later. How d8etks4 dzb+;as/ lkgp1+3kx weep is the well? (Ignore air resistance, and assume the velocity of sound is 340xka l 81sbwtd+e4 kskg /3pz+; 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 wave of frequyvk 9a 2g7yt u)dzllh1gx 03xu/o -br/ency 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 axp k5n 4)4reghogf.u,t $23 \; ^{\circ}C$ 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 dt wgz kxd+4q2.m9zb+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-- 3 aok3o+ ypv2qzun-bdB 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 intensities1 d dzmoad1r2gp o7g aebl3usz(118h9 of two sounds with intensity levels of 70 dB and 1ez d1 192mrbpzugagl8a(o 71 dods3 h40 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 enginesuzeeegm;g1k53k 92bw in a garage is 100 dB. What is the intensity level genere39ue kgz k5m2bg ;ew1ated by 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 distanxmt; *t8*og( 8gbu+-ohm clg dce of 6.0 m from a source that is radiating equally in all dilc8gh(b*-mu* d+8g; t xgomot rections 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 froz5:eh*n )wmxqm a source that is radiating equally in all directiewh mqnz) :5*xons 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 pve,*:/ji huj c s:r*k y9v5srlower, which is assumed to be uniformly distributed in all directions. What is rr *: lus/kv:jse5hc9, jyiv*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 from a barking dog. What woul. pqsx-z3qt t;d be t -qs3zpqxt t.;he 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 sz;smn4pj8.u.vcbm 2lp/z 0dfrom a sound source the intensity level is 60 dB. What is the intensity level (in dB) at a p./spz l8 pvm 0bzd ;jcn2ms.u4oint 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 f0g0 xgwc5 vci2.5u us2xtr fsn-(1sfvrom a point source is 95 dB. At what distance wil(.t 0 ufgssuv51nfgi2c 5x v r2ws0-cxl 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 comple;qbvgd z+2jehv+ ut7:x tone has a frequency of 1200 Hz. What is the frequency of the fouuh2+q;bv7+gd zj ev:t rth 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 .k2t eb ga9i 0ea16y3.8btrd-gfs veeopen pipe is 900 Hz. What is the length of th0 s6gtde32e9 .vge. kb-eaiy trab1f8e 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 pipe of length L is 400 Hz. What isz l(mehbhy27xaqeq ;i1 nr2qt-j5-o 5 the frequency of yq er;qt (7mzneb-2q2 hjhxo l5i51-a 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 bot wd0hv 99n:jfdh ends has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the h9 vdn j0w:fd9frequency 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 ng)ohp hw(i*hx6hrmg6h0r5) 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/l/ 7bgb ku5ky in a pipe closed at one end is 330 Hz. What is the frequency of the third harm/ulyb75g k/k bonic?

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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 f,nq*x,f-prr f1z/an closed on one end that will have a fundamental frequency of 60 Hz on a day when the vn , ,px1azrrn*-f/fqfelocity 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 i9 h c xqen6p2v*lu3)jms $20 \; ^{\circ}C$. 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* ; ukbzk4wtd6ure 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 played4.-2 f q4vgoo 4 z5pis 0h4m5 upas,m6abitqqm when the speed of sound in air is 340gaoq5qf m ,t - s4ov44zm4si5m0ip hbpuqa6 .2 m/s. What 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-7lxzq/ 6s0oe6e trpefn+is8 l 40zx4ofw2 gx the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the-r4e 40nq/owexs gtp f zllfo e02x86s+ 6xzi7 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 velocirto-,j* cs 1 d.pkl2kbty of sound is 340 m/s.o1jr k*.,l tpcbk- 2sd 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 placed side by si,d,d:z 8o vu,hz (pvu 5xez+rsde and driven by the same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the pdeouv uzdz, 8x :v,p+(hz r,s5erson 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 4403 7d rqoi2bdo1 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 tze4-z6e ce1l qqh(-rs he frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is ts1rc6lzq- 4q (eh- eezhe 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 twon1vdx w8mukm631b4q e horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day whemwq3u 8d11x6nk4 ev mbn 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 found tzp1zf.w5 /1wclrqe1lc1 g c 6io produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage chzw ef6cpglc r1 /c11zq5. 1iwlange 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 sound source at twice ,(p84l 0ezcms2hq(5 l,tyu gkr1 qsfdpoe7o/ the speed of sound. The obser/pq0(h de1 ,qo l ucp7z5(e4mgyrk s2tosl8, fver 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 frequ4qw bf:qa t+-z1h+x5jlxft9cency of 1000 Hz) approaches a stationary observer atxjqh4a- lzx :+tf+ b c1twf95q one-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 1000 Hz. If a listener moves wit(0lw rr9 yb1nxh a speed of 30 m/s away from the source, what is the frequency heard by the observer? ((1 y0l9bw rrxnThe 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 gsig 7hkvo+wmkmn)8 o +uip0n4n07 t( traveling at 35 m/s on a day when the speed of sound through air is 347tsmig0n0 ngui7+nhok)vw kp4 m8(o+0 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 observe3.* /1 7/c twl,wlsfrlexjw rn gmmr/7r 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/we7 r * 3 lm,wgls /1mxrjtnrlc.w7f/ 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.5fp 35p:z4uxhz k7zr7uq)u hk;mjk ( r The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. Wrhk(kzz x7r5;fuq u 5: h4ppm) zkuj73hat 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 6v636dcrxcaw stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/d 3x66arvc6 cws. 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 blob *(8y:irxw98a, ojyitys: buws its 400-Hz whistle. Take the speed of sound to uibo ry,w i*j9:txs(yay 88b:be 340 m/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 whistle, and y kxka*q-7s6thjn *cc0ljh46 u ou hear a tone of 400 Hz. nc04h67q6aljk cjh* u tx k*s- 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 *1wdu2 totg)8gn,.p17q9 q ic jnspha500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an ob2.9 npn c1qwpga)u,sijg1tdt *7q 8hoserver 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 t0+ +rfca az glz7zs0i8rain horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an sczz 8 ilrg0++fz 7a0aobserver 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 anqe stj9eh 35j t6z+ 3pgs4ffv4 object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speeghej4t q93 e45j zstf3fvp+s6d 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 prxr1nl)zsz8mr2k u5 9e oduced 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 ofqv :e9dshap /1xm.;jl Mach 1.4. What is the half-angle of the conical shock wave fo :xpa;/mlsd1jhq. 9v ermed?

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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 j)a(d18d,xf6 .ugaf gws wb*gEurope with a Mach number of 1)gx.bj aug6fd s*daf1wgw( ,8.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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