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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 false statbzrh2ej0 .lv /(bkq;xement?

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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 througe ay3htw(kv* -h

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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 s .:nladgi,4jsfl-d8vqj z / x8ound 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 increases4axou,vxa x1f8 .s bhznf88 m/, what happens to the velocity of sound? 48aso mn/x,xvuxfb8f8h1 z. a(Assume 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 yq( nc hyb;in5huun8- 16 poo3400 Hz sound, the velocity of a 200 Hz sound through aih3u 5b(-onyq8u1 yihc po6n;nr 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 v+,o.p 2*rt xz5x.srg dn*p wfHz sound, the wavelength of a 200 Hz sound into*g r*5fsx r2 v p.pn+.xd,zw 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 frequencie), ddqdr kn;5us 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 casl+*dwkk /c x6;p zet;lled

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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 emittix-;**8pvg;r7kj1/ui4j- gmrpzzu 6r l uo hdzng waves uniformly in all directions. If you move tv 41uj6*dhmzj;-z/irz 7 ;p rupg- r8lxkog u*o 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, intensity i ru4/7oi69kk w)nh3b abrr hg7s 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 sobffm26( p5x)ot2wi z1*k- 0m ap ejivzc (a(pmurce at a distance d from the source is I. What is the intensity at a distance 2d frof*pm(i0 pm1wx evfcoa(z k6 t ipb( )a2-5mjz2m 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 sours3iic rk*x :do e(i5u4ce that is radiating equally in all directions. What happe5idrok 3uc e*:i4 (xisns 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 wi;th l/vmx 1-radiating equally in all di/;-h1tvw lix mrections. What 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 a soc lbztfwa3 bc149rz50 und 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 charac-9px.ur0x at yteristic of the souurya pt0-x9.xnd increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudnesx1 : dj0da9vj 4dx8hpss" 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 "pi.*ioh 2;k;endhedex 3tch" 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 froqnhh6 0v 3n hklge9d,wd *bgjg)z -2.fm 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 displace b7h3e/ck7 1ss 2ftgg-tcp+s rment 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 2j pv.vbohi.: the sound wave generated by the guitar as a result of this vibration. What do2ip:j .bvvo h. 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 o7my(/av4 5jj;pp cl2qwuw k)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 j0r)+rqko.r6 32us oqdmi 1skai5q7 lwavelengths of the three lowest ts3r 2qmj. dqi7k +uiar 0o5sr61 )olkqones produced 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 fj/y 6kdmxmi32/hd y1ic sm)- of length L is 200 Hz. Which one of the following frequencies will not 3m y21c)m6i fji/hxm-kds/ yd 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 i4fsf -)v cr;nats fundamental frequency. Which state) n- frfc;sa4vment 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 cl(8x 26fiebi -u- fzsl5qqkon 7osed 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 wavel ;vus(/huzuh3pa 9*ks-m5uxx engths of the three lowest tones p9/ 3vu( zsuh*-puxs a5; xumhkroduced 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 i3d9 hpq l(bc8ln a closed pipe of length L is 200 Hz. Which of the following frequencies 8ldq l (hb3c9pwill 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 fufb-sxy;zx, n4 ndamental frequency. xz,x-bf;sy n 4Which statement 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 by the same 3qg f(2m ll*l*z g,4jb 7vq*mlldmf3fsource. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound imvf* ldbg(*l l3qz 3,4f7m l2m qf*jlgs 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 havr6- g4ya;vhj3 6rajore

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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 ton2 ie0)z fkx.hgether and a particular beat frequency is heard. What happens to the beat freh.0zi)ef n 2xkquency 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 ex76+lgezczv 3(b,ixhz plains

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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 frequency heard by the obswki( -iej8g) bbm7v ,terviek)7v8w b,t-bi jgm(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 stationyc8 o4-ztq gb4ary observer. The frequency heard by the observe -8ct4bz4 yogqr 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, itlrp:q* ft eq1azc.u88dtbap,zmht:, rzp;5 1 s half-angle will decrease by a factor az,tc.rlqm th d*tue::1z88b;a q1f pz5prp,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 4qoggptz2q,6 p2vazot2(,g- f 5 kHz in air is 352 m/s. What is the atv2gz2a2p(p 6oqfq- ,,g zgot ir 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 sound tc3wccr eu4pp/38f z(d fzd*mq) rh/2in 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 shriek w offz+dz5ze*nse m2 o,j+ *z;qhose echo reaches it 0.0+z*;fo zqe2 z,deo m+s f5nz*j250 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 tgls- w z ez314f-zcmz4emperature 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 dg0 vn x7.;e2dy3rqfrhfyj 2 2*wxmr8 a flash of lightning, the distance to the lightning strike isgmvd fwrnf 28hj*q .x27ry2reydx3;0 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 dayyys -(/nj h*1kv2wtoqb0 2hox 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 splas/. srwf8mdmrdyir3:7 h 2.5 s later. How deep is the well? (Ignore air resistance, and a mrr.w i:m3f7ys/ddr8ssume 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 sound wave of freque+7sv :u1lsty. dou 6zrncy 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 cfx.q ,; qxew9t3x b1yat $23 \; ^{\circ}C$ 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 of9 *,as5 ga ctak* l*rpqxobbwke-8-y8 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-doqa r62n+cd gxh;/*dx B 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 qco;8h /j m4vrtwo sounds with intensity levels of 70 dB and mq o8/4c;hjvr 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. What is the int yf2rw0iz vljb84l n8:ensity level generati24wyvb0 8 8jnlr:zfl ed 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 thatyf )ps:wxtxhnt) 60n7 is radiating equally in all directions i st6th 0)nx):7npfxwys
$6.0 \times 10^{-10} \; W/m^{2}$. 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 equally in4nosr3 jaz q8. all dire8r4 joqs.zna 3ctions 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 uniformly ,zt 9x6ty:e-kdl1 thodistributed in all directions. What is the intensity level at a distance 5.00 m from t ,k t91e tz:dox-hyl6the 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. Wh4z 6mrxpf;p j-at would be the intensity level if two identical dogs very clo rzp;4px j6-fmse 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 intensity level is 60 dB. Whq nat53jq3ech+6p 89s pasr 4wat is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source rss986eqr33 4j qnhtwac5+p apadiates 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 sourcef //h plq*08hcoc9l ew is 95 dB. At what distance will it8lchqe/ w f* poc90/lh 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. , qgu6bmt19g* jo yl6iWhat is the frequency of the fourth h,9 b6jo g*1myq gtl6iuarmonic?

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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 94c+n7,q5uzg e oc3az7;+u ot0xcvscz,o3uvl00 Hz. What is the length ofc e,c7 z +uon sq uo4a 3tgv,z;lu05z3+cxco7v 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 pipe of x0 q0cy)b.myhjn1 en6: f4e-s g(.dai2vdcmr length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an 2 mbc .(jgq ei-neh cd1.vfs: a600dmyxn4ry )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 veloy;+ x c0ju3fqrcity of sound in air is 340 m/s, what is the frequency of the j3u c+xyf0 rq;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 wt+ ai dybx3e;0here 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 pipe closed at one end iyua)nha ,9r8a6s t xx4s 330 Hz. What is the frys 94at )a6nrhx8 ua,xequency of 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 of the shortest ps ..6 el(l-fusdaro8oipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocil eraf..so6 8sdolu (-ty 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 wh c.jbi a vc*(u77of/cvere the 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)k5y*enz7ti am2 kx.lg,o wy : 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 . 67pquoo3mhc(/ dasg when the speed of sound in air is 340 m/s. What is the fundament.m3d/6 (aqopohc7gu sal 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 saa5 zy2a:j4r4r s czf+ame length: one is open and the other is closed on one end. If the fundamental frequency of 5ac24:4r zfs +ajy rzathe 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 air8 h616 j1bgdv zqaxw:ru,v l-bto6; xy where the velocity of jduzgx;1w-bv ,q6ta8xh6o6:y r bv1lsound is 340 m/s. 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 side and driven by the same frequenc8gdy+a kg*/b,a;sriom dtl: 8 y of 500 Hz. If the distance from a person to one speaker is 5.00 m an:,;lr+m ygbdsa g8i 8od *kat/d 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 beat frequency8mxgge3 )( pnceki8n6 ?

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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 tunlu uwn2322+lu4b z+yboy .x teing fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is tw2zu2uxlb24y + bu+lynto3e .he 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 w6 w;z a;s db*5ki-dx8wkt5xj 7 m respectively. What beat frequency is heard when the horns are sounded on a day when ta;i5zkt*6db- wwx58jdkw sx;he 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 twow 7j +i0h8snyzb(pb0a violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is playeds8phawin7 by +z (00bj. 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 sour;g,i-id 6v( w3gaejxkq+ hx5w (kf4zo ce at twice the speed of sound. The obserojae(h-i (k ix3dfqg 6x5+vkg; ww,4zver 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 fr5*i -mr2qj)h( eznw znequency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer zh ) (erjqm 5-ziwn2*nhears 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 ma(:08tlajs h6p kl4r goves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sountj4l6g0ah r8kl a:p s(d 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 traveling at 35 m/s on a day when t+ww6.1vw ryh jo2or5id1py 0vhe 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 freo5r60 v i. 1h 1jyvdwpywro+2wquency 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 when a train appr+eb. o,/lapce oaches with a speed of 30 m/s. c,eba /o+.epl 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 towardq98:zls.oz s u you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hea9os.ul 8zz: qsr?

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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 t((u nqeu- +rgits 400-Hz whistle. Take the speed of sound to be 3q r(tu(ung e+-40 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 itgs bi )1mqwn.s22u(cvs 400-Hz whistle. Take the speed oq)vsb(1 g22usn cmi w.f sound to 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 km4otv3bpd4) 4ss (iuf u/h. 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 of the whistle?sfsv )3ou u4ipd4b4(t

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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. Ade*5 9vdzih;1e xnq)i ssume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observe)vz;n 5 9ex*qih1eddir 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 7( meu2 o4hrjf*o:usyis 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by af muurhs joy*7(: eo24n 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/o-4m8u . kbv ai6ljix. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast iso. x/mk6aji 4l8ivb-u 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 sumv nt: 1ttlm/g*c.o4 -ot,nz epersonic 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 half-angle of the conical shock j9ud9 n+f*l gkjf;ju(a1+ sss wave +9lg 1jujs 9s*f;+kan ujsf(dformed?

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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 Eukr )(dr+3 juk8 (pgwyarope with a Mach number of 1.05 where the air tempera+ yw)dujrk(r8g kp a(3ture is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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