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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 followiq*16bvu (9 lou-igptv ng is a false 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 faste ygcs i(w1c*/jjo u5k4st 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 sounvs )d)g w4h8bnd 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 happens to the vel 2gpm7o ja0-i0yox d( fap4z(hocity of sound? (Assume that all o(0m - oa4ap zijfhpd(y7g02 xother 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 velocity of a 200 Hz sound th l6gjbn85, 89zwuoimy8k3xgarough axg uy 8wl 5in386az bk8j,mgo9ir 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 ah. l,kd k6 o 8ojhr:-szym/q.k 400 Hz sound, the wavelength of a 200 Hz sound in o k./r-lzhy6sok:djh.k m,8qair 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 frfw8i3mv18q saq 4*qzeequencies 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 are calledu/zn1r7s k; rs

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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 d*. h p)wzv1n,kcr su*mirections. If you move to a poin*) vc1p.hs k nuwrm,z*t 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, 52ub.wrm0kr8hs. 1aa l hf.j iintensity 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 from the source is I. What is11v k.a z5 hbxpcchk5ms1+d, s the intensity at a distance 2d from tm5s 1dk 1,5 xhpvack.hb+czs1he 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 thaygl (6f(+icwb 9 z/kbvi9kh*st is radiating equally in all directiovkgc l ib9w/hbf9 *i(y6z(s+kns. What happens to the intensity of the 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 equg:l9t (sw/7lkiv) utd-w c :qkally in all directions. Whq t9(lcd-t/ )7klvgk:wu: s iwat happens 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 increases as fua4( y.5 hondhts0el1 m16nha 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 purah19mvdy8 (qme tone. What characteristic of the soun1hmm9yv a(d8qd 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 musical note?z1 7a6tko6a8oqsrkb5.o 7xwa

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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 n6 biw4wl4k3e1gmz5wkepvh8 67q 9 fofote?

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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 into kk-ykr .p5w*4jiq zp4 water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacementk- mc0s:tq qebksi; ; r1me7:h 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 g.hcxp91hiaz+ uitar string and the sound wave generated by the guitari1xz. ah +hpc9 as a 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 0za bvz f/siw;+ :ny2xwhich 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.+hzl6sxc -178arpmd2+mv szb What are the wavelengths of the three lowest tones p 7-+mrl6 chb ss1pza8xmd+ z2vroduced 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 pipe of len2u3,hbh eo n,qgth L is 200 Hz. Which one of the following frequencie,oqh ebh3n u,2s 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 fundamental frequencg +i+ jrdkt q;dr y0cr5*sh,9wy. Which statement is cj*+cdy t; w,dq9s+5 h0 ikrgrrorrect?

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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 z,c-e;3 n6(t gtu mhamopen at 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 lengt 4 yc5 xyohzo/o5 y8cc)ycgb.6h L. What are the wavelengths of the three lowest tobcyccyo55g6.c 8 oyh) x/yz4ones produced 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 of mib.ejvh co. +n1a/ o9the following frequeb. + njaoe imh.c1v/o9ncies 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 fundamental3*sp ktxbkp:1 frequency. Which statembx *pk skt3p:1ent 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 speakers driven by0hxvu ii1: u(f the same source. Each speaker produces a tone with a frequency (xuiiv10h uf: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 *aut0un:ix u6qzn 5al v/-e b6should 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 a,y91p9v mtm3h+de) kfqft-siz ob/. dnd a particular beat frequency is heard. What ha)9h+id/v9ekmmf -d, szf.3opyq1 ttbppens 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 explaiirn;j9y.k cy7qp-ew;a93hex , gp 6swns

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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 f /pnz z o:,m-vtpc a8n74pu6ghrequency heard by the observc6zhn8 /,-mvpz n:opt 4agpu7 er 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 ;z0 -it0 ts/ w:o nnz,esqhigim7/sd:q-xuc 9observer. The frequency heard by the observer oci s e;9m:t70 uqi z q0w:,nshx/in sz-g-/tdis

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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,babjv2n4x 6w lp5k1e2 its half-angle will decrease by a fa52v bk61xa 4jwnl bp2ector 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 sov 7+ewwn9 bx:eund of frequency 45 kHz in air is 352 m/s. What is the air tem:b7wne9exv +wperature?

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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 ofia0ee+sl 3lo+50sgri the 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 bat n3g4zo xp4dm0emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back the soun3p4 nodzx0g4md?

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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. i-uou69 ) y 2h iop1fnxymda13The 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*q,fnw n 1bqnchi2x8t2 gs/ k/ seeing a flash of lightning, the distance to the lightning strikifn wsnkg1b/ 2qq hxn /t28,*ce 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 tem f.d(ucr qf:pi8:p/v sbi-czi2a3 -w ;gab0 wzperature 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 d sgkcwg-z*1bx: g+s6 edg (wq(eep is the well? (Ignore air resistance, and assume the velocity of (g:6gzsb q *c-s+wg( kgex1dwsound 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 sound wab7vpnzez; *wb nw(d9,ve 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 am 9c vn/y1pon:-edp 2ht $23 \; ^{\circ}C$ 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 le6 -gzlk-b:9ysgre s: 5zwt:elvel 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 70-8vt. lkmz 0 8hwlt rqat)q330ldB 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 themh8ad1qe t2 b /dpnil6,eaf9+jlu7 :l intensities of two sounds with intensity levels of 70 dB and njpq2i deadlb / h,l6l8atf eu 179m:+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 a garage is 100 dB. Wh:lid7q ds3km- p8bf5i at is the intensity level generated by onisk b58d:qp-m7di 3fle 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 source2;nlneicys 4 g.tu. v+ that is radiating equally in all di.g 2 cn .yvu;iesl4n+trections 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 fvxt j.jim k3;(ys2q(crom a source that is radiating equally in all directionim(j2cy j;. q3xtsvk( s 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, wh14 .-hzri 1ay9klgf8lu 5 zdw ic;1exoich is assumed to be uniformly distributed in all directions1od cyxuli;ae.zzk-i 541f9 lg81 wrh. 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 iscm52f5u,g jt n 65 dB at a distance 5.00 m from a barking dog. What would be the intensity level if two ide tg 5fn5mc,u2jntical 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 al(v fw1en)t/qe 3us(z sound source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from u)e s nwz/t 1(f(elvq3the 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 source is 95 dB. x7i6 wom ,zkpas 24*bzhsqk:* h*vp5y At what distance wil i7a 2kbzvh,4x6wkysmz : 5op***qphsl 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. Wdri: 4x/ x90y nz.jqbfhat is the frequfxbz 9jn:4xdri 0q. y/ency of 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 harmbwe,vk 57-+xhc e f- y0a33zqaax7xm wonic of an open pipe is 900 Hz. What is the length of the piw+,hfc503 am7xxaeb3 axe w 7vyzqk--pe?

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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 4 v35yd5wgj)vjqlke6t0b2xm r5+hopurs;m3000 Hz. What is the frequency of the lowest tone that will resonate in an open pi xgy26) 0vpjmkbs3l05 +u5trwd3 ;qv r hoe5jmpe 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 le j.; b/vca*y jr3lnzzc/wv0g:ngth of 0.80 m. If the velocity of sound in air is 340 m/s, what is tvr*ya;z v cg0. bw3/:jcjz/lnhe 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 wherrlzjvgj1pt 4 le,- hb g)a9c+j :+1pyhe 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 pip:a3idg9gr (z.z i.c hd2yhmxi87t, vp e closed at one end is 330 Hz. What is the frequency of the third har.9dz idmg:t zc72y h.8vxi3ah i,p (grmonic?

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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 enbj q-sl*wlsz;p i0h/u5 vt e(2d that will have a fundamental frequency of 60 Hz on a day when the velocity ojps /h52(ez - 0iwvs;tu*lbqlf 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 thxq eaj-vo(q8 0e 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 vm- :(rk yr hvrmj*ewg6m5dn66ryy 6;a room where 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 speed 9sd+)2jse9+k tm i ur3 jklgj- pw1y5zof sound in air is 340 1emjk5tk2zgdyw+ps)9r9 j 3 i+lsu -j 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: (9vjwfg vk -z;one is open and the other is closed on one end. If the fundamental freqfk9;vw-vg( zjuency 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 air where the 4fue(myx1-vivhw1 erzs *, 100owi sevelocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observee10zf x(im , 0u*y1 -isewoh4wsevrv1r 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 side and driven by thjra n6-c;,iun k14cv -loov*k e same frequency of 500 Hz. kj-oiuvco r1lna,cv ;46*n -kIf 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? (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 e;+xo,rht y4uthe 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 tunwv(v wo6ub*/ning fork to tune the frequency of a musical instrument. If the tun ww*vo/v6bun(er hears a beat frequency 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 mrn otdc 8cns:,lq3v:. respectively. What beat frequt3,r: d8.q nvlsnc :ocency 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 violins in an orchestra ayq:ux.go d/e5re 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 bringy/o .gd:qux e5 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 soundwps:++y4ac n /ifl4kt source at twice the speed of sound. The observer hears a frequency s ln+:apwkf4i4ct+ /yof

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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 gvfh-42sa wb5stationary observer at one-half the 2h w sa45v-fgbspeed 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 with a speec,fbac yp t 4 w+x7c+00ti3mbmd of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is w+t cix,a+btmb73c 0p4 ymf0c340 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 35 m/s on a day whe.78;fme/x u fz7lr/(wid qshrn the speed of sound through air i d /zsq8r.muf /(hl iw7xr7ef;s 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 wh ) xywv(sfzsg+mi v*y /)ho*rt2hkg 35en 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 340zxh yg 2)fyh/ vv*5)3ws ig(skt*m+or 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 train blows its 400-Hz xl xs.6/0k7fm:)w8d sqdn zvr whistle. Take the speed of sound to be 340 m/s. What frequency : .srd zk fxm/vqn)60sd8 7lwxdo 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 is y 5;yhno2x1cxl5o2ir 5pa7 train blows its 400-Hz whistle. Take the speed of sound to be7 y a5ycso;o22lir5x1hnp xi5 340 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 bl* 0: , +zvducmz.khol3akeq/pows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What fre*ol0pequ/.+am zdzv :h ,k3kcquency 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 wh(v3b 1e-qbc2 mmo0ru distle, and you hear3 rqb(12mc -d0mbvoeu a tone of 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 hvm rc9e/sltx,gk5 rx9;n *)hh orn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving v;nhm retc/r ,x9kg9x )sh*5laway 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 souculw9 ezq*alf8*+ vdy(e3m3i nd in air is 340 m/s. *e39a + dqlfvcm3u*w ileyz8(What is 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 sign02 dd/n3k0af mwez2konq ja 45al is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the obje002kow a2fkqdj zad nn 35m4/ect 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 co-ogogu4 l c jw+4ri::,dlkp3tnical 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 ha1de8gi97fwq( 1o. um ,ghc mmsq+;gpf lf-angle of the conical shock wave fwiq+1ceh( mgs 8 7;pgm,odq.f9g mu 1formed?

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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 with a Mach numiv3c f,fxm7m3ooqo l0 h c(-(tber of 1.05 where the air temperaturoh cmf(i, 3(lqvm7x-0t ocf 3oe is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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