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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 /v w ;iqg07l5hohzes0a 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 conducted2p(4/n/s.r etbhusbo 9f4nq h 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 s.)2zj g7rmh mxbwgc :z6mf 1;ateel 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 soux0jn*p6.1wre ac cu 6rnd? (Assume that aj* 1e6r.0p cr acn6uxwll 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 s-q6r)zha l/ sxqi6 w 7anx;7w+ 7tcd6kmb4vkwound, the velocity of a 200 Hz sound through6/ ixa ;v 77ts4nrlkq mw67wqxa) -+k6wdczbh 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 wavelength of a +2dtzx0v ; /nulky chp qru9;1400 Hz sound, the wavelength of a 200 Hz sound inc0; uurk/t1 ;hz+qpdxv2n9ly 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 greater than 20,000 Hz m uk9ct sm-*f(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 are1g x(gqivv+ kyc25 w;i 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 em i+9po gulksv9uxbif 02428 ua)y*f hiitting waves uniformly in all directions. If you move to a point twice as far away from the source, t u+vg9hy u f 20ip)ka*i4xf2uob89ilshe 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 to+ ls/9luitutx(. np(n

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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 b8vlt ax*tt-8source is I. What is the intentx 8t8lvbt* a-sity 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 radiating equally ina l3c)2rd0sbd a,5g vk all direcdv ,0a5kdlr)23c gba stions. 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 ra; 4tfky*tk m25xfe t-lx4*caudiating equally in all directions. What happens tlu;* -xy k4tf m5facx*42 ketto 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 a sound becomej1i) 7wxw1buws 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 ch;u:c+x9im vdq*yn::o m-byu faracteristic of the sound incrx:+ ;:ny o myq -iuu9:mbdvc*feases?

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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 mus3tvh7px;ia-y l3zpk 3 ical 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 "pitcqkvbhd/1sj s/ dn e0cm,fz,1s,(p rj1h" 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 froh+,ha 5td(g *4ep cgww p3/vpfm 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 displacement waveblu4 d1ipyt 1).qh uw0s 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 stringoo5)j( w :zndj and the sound wave generated by the guitar as a result of this vibration. What do the:oz)n (jd5ow jse 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 whice)w* .m6q,i56s rkj e rij5ckfh 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.xma.tye*cqgc(oi0 .+ ;qipnsx6 d)6: y pe*pr What are the wavelengths of the three lowest tones produced *epseqp;y x)rqi+ . am*gc6y6o0x p: tdi (cn.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 resocls o/l+.nb6 v7j 9pannate in an open pipe of length L is 200 Hz. Which one of the following frequjl7 nnsp ab6lo .9cv+/encies 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 rez;olx8 hop z,eho8 *r+sonating at its fundamental frequency. Which statement is corre, eo88oh*zrx;o pzhl+ ct?

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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 ,surbq/f1g0 lw3 yf:d which is open 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 leng mxgcv 06ai1wb3t. b6ath L. What are the wavelengths of the three lowest tones produced by this 6gbav1c6.t mwi xb03apipe?

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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. Wv :aaocv31x lj;xzp .kl:f 5:dhich of the f lz5jvc;:do:.3pkax vfax:1 lollowing frequencies 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 frequeysf5zp*3 gm59l dy tm6z es.w;ncy. Which statement is correc 3ml st9pw5medzsy 6 *yz5f.g;t?

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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 thm8fzfy6 tsv) -9d9ta pe same source. Each speaker producf6at98mtv)y9f zdps -es a tone with a 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 wavesk;fh0gy s-c p8z: l7 rg z.hpzgd.31b85dgkqf 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 particular 2s n)keny 4llekri; vf27x:g8beat frequency is heard. What happens to the8y vfel:rens4xnk k7l ;2)2g i 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 explai rbvp)gq2 s0pko :imqy:0jp/1 ns

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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 st mfy p*/3iq bptu1-jrth9al72ationary observer. The frequency heard by the observ9 h/pymft qiptj7*a-1rblu 32er 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 heard by thef1 pwc:;k fe8d89hfl q ob9wlf8 fchp:d8k1;eqfserver 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 wiw;lnnkej6w;yn0g.i m0 6q8 gq ll decrease by a l0knwgqw6j6nige 0nq y.; 8;m factor 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 ultrasmst3rew txg-8)k4m:*ct ta9 t onic sound of frequency 45 kHz in air is 352 m/s. What is the air temperatte )mc *:4w8akxtgs9tttr-m 3 ure?

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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 sound in a)poy:;wtj mf3ir 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 eoes+j,d6gldl h 0;,yv(y0zdqmits a shriek whose echo reaches it 0v0dsdy,ly 6dg,+o( jeqz0l;h.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 s. The temperatu0wqh. e veef9 (fs10mare 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, 6.ku wzgplcp/ 4,ss0v tp;dy3 the distance to the lightning strike is ap;u0p.c,4wy 3lvsg/ dpkzts6 bout

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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 tu6-j 9m2csrcc*093whkgv1 j ;sqe cpyhe 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()6 b kb,ncaqo s later. How deep is the well? (Ignore air resistance, and assume the velociq),bkabo( cn 6ty 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 sound wave of frequqj)/3 mb* jtjic x.lt3ency 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 aw im/9*t 1yifwq;v oo/ir 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 level of a sound with intensity 3.jzl7a 5 s hmr5i6tau,1b mmz$10^{-3} \; W/m^{2}$?

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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 o+yi fb l8b8ptk 52auewb t;65of 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 sound+cyvxo kepu m-h012/ks with intensity levels of 70 dB cyp -k1/vu0+moe2h kxand 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 1fge7:(j - gxil,3opq e00 dB. What is the intensity level e ( pe37fgoig j:,ql-xgenerated 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 distance of 6.0 m from a source that is radiating equally qbcea6x;v,djz,l)kvw)6 1k xin all d)c qw x6bajk;xv)e,1kd6 l, zvirections 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 radiating equ)gb/ r3rmxjq 2)t 9zwgz/j5 g2bx1xsg4r b5hqally in all direrqq /bmgg9jr4t r2)1xh s/5 wx3g)zbjbxz2g5ctions 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 delive ktuw*)ph9(+l0 z+.ul rh:k+v qdw kders about 1 mW of power, which is assumed to be uniformly distributed in all directions.zu:lp9hwukk +t)0ve rkh(*d+dlw+. q 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 from a barking dog. Whsi:go 8 4igd6(pvj9 xuhg3l2tat would be the intensity level if two identical dogs very close toj3gd(92gogtuvlix8: 4h6 s ip 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 intensity levs v4g,lodb -f81*; kn;dnbftlel is 60 dB. What is the intensity level (in dB) bt g-1fdn;nskl,*f l4bvo8;dat 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 source is 95 dB. re6vy tu p r30ye7(k)p At what distance will6r)7rukee(tvp y0 y3p 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. What is the fkva;(hy9 jz 5my5k+ej-g uni)requency of the fhu9v5 ykygn+jkim-j;z5e a() ourth 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 leng u;t6 ryls0iekf3d q75th of tik76s qt;fd5eu3rl0 yhe 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 length0hh, 9/tljtpcd i .5c1cv ejm. L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of lphl.,hdtt.vc0 j e1jc/c 9i5 mength 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 v+wc a8q)/ ilx +zr1at4jmcpa7 1qxn9b+caa w1elocity of sound in air is 340 m/s, what is the f 9+a1zb7c1m+4 tpwjqxw)a/cal xaa +n18rqcirequency 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 i)(zc*v xkrl,-o t ;rmys $20 \; ^{\circ}C$. 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 6b q)k(5egxpndz-j k/330 Hz. What is the frequency k(zdpen)56 x b-g q/kjof the third 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 obn10xt)7l un( yq rlv6f the shortest pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when tt7llub0q1 yrn)x6 (vnhe 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 thed/.e+fd6h f tmixa16zl7 p2qc 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 a room where the te/z2w;zo hq. f.kvzv q1mperature 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 play2b0c/ x33r)wojq aq6gse iw 8ued when the speed of sound in air is 340 m/s. q8603bew3 r2uxi qcow)s gja /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 on3m cx*,96txd3agj as f the same length: one is open and the other is closed on one end. I st,j96a *3 cngamx3dxf the fundamental frequency 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 Hzpo27sc7ut .u j in air where the velocity of sound is 340 m/s. Howjt.2c u77pos u 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 side and driven by the same frequency.unm 6bp*ziy, lwla14 of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person detects little oui1 n *b.yz,m plwa4l6r 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 frequen b.(ir**glayvs5f5t bcies 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 frequenc l6e hal4y7vt:q5a3wj,y:lp (dum+ms y of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of tvmq yh(3jaw6pal l +4u7:tdeyl5: ,smhe 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 horuti- 69:9tkkc bb,n orns are 6 m and 7 m respectively. What beat frequency is bk:,9ic- t tk 96ounbrheard 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 tww4 xi3vgv3osgtspm2y.me* uj k63t01o violins in an orchestra are found to produce a beat frequency of 2 Hz when a frem t.wjpsi e3sy3*v3mkvo u 2x64t0g1gquency of 660 Hz is played. 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 sound source at twice the ya06ngqm ar91iio ( y9speed of sound. The observer hy1ygo9a9( rmi 6an0i qears 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 frequyol 5gs2mke,3 ency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a frequency y3 okes52mg,lof

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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 speelj /)x(h kb)+kw0i4cy rzy8g qd of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 340 mr ykg0ciwy/)4lxh (k z8jqb+)/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 8003m*h3-b jbaagv 8fgdb(bd-*e -Hz siren. 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 observer who is standing along the roadside. What change of frequency does the (*bj3gvbdeb3*a-hgd mfb8a - 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 b+sj 9ha0uikh;t dd rv5ol,dsey63.0w y a stationary observer when a train approaches with a speed;6iset.hv0r 0aou3 5kjs9 +yd,dl hwd of 30 m/s. The frequency of the 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 kes*a) q 1t-4/zfnq jztoward you at 120 km/h. The train blows its 400-Hz whistle. Take the speedk) /szjn1 t *4qa-eqzf of sound 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 blows its 400-H+j+ bd )mjagz-z whistle. Take the speed of sound to badgj+z+-mj b )e 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 ny ():abddbc t8 h6xb8km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequench(b ax8t) b:8 y6ddcbny 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 whist76qhk:/ v*rxh 9vbd xyle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/sd/vxrv x69*h k h7qby:. 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 o uu9k1fl 1e0b5lywy r4a .vr+air is 340 m/s. What is the frequency heard by an observer if tr0uykv bly5r +lfa1w9.4euo 1 he 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 i j.7x t,fwqu6axh t52os 340 m/s. What is the frequency heard by an observer if the observt.2au5of7,hxt6x qwj er 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 sp vp,3 qhu)s tdxqmjko9+qy2a,)1 +mxpeed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. um p++ 9)3vaj2,qky)os pdhx,tqq1 x m 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 con:kv auy:o,iy(kvv:d ) ical 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. Whg s;ct9c3ssjh:9,n+ xm z6lumat is the half-angle of the conical shock wave forj96zt:lsmc9 u3s ,cs+ n;xhgmmed?

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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 nktlw8/ dlky2r hr9k66umber of 1.05 where the air temperature is kk6t/ kw8 2dhl6ry l9r$5.0 \; ^{\circ}C$. What is the speed of the plane?

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