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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 false statemem f (7wye.ge y4d)ps(dnt?

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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 f9qvf/sy 8hz 9iz fqt4,astest 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 soun,pfy pkwf5 dj*s/ig6,d 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 velocity of 3j)y1m j ivlktsa*21d sound? (Asss321 j 1kt)i jdvymal*ume 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 40drykw yhxoba0f .*+570 Hz sound, the velocity of a 200 Hz sound through a5+ydk.fwhx y 7 *r0obair 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 Hz sound, thjv,sy lvbqk;-2. jd 3oe wavelength of a 200 Hz sound in air -s2djybv o,kvq.3;j lis

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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 qyy+k1 8 sz.maHz 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 vroz7e0+ ur7t f,:zo+m ft-k wpv/fivcec-* 1Hz 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 uniformly in all directions.t jkyap9i.v)5f,4g wt If you move kyp9.5t f,ga t4v)ijwto 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 wavesn;j6j9 our(w g, intensity 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 f6mx:zx ash4 rgmb-j8+rom the source is I. What is the izm4+mha:bxr8 6xj s-gntensity 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 in allmo3gt)mel yj(qd: )4 f directions. What happens to the intensity()4q:m f jlt)myo g3de 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 equally qi53xfmzc *2 x+8fv b-euc2 *e6bn bfrin all directions. 5erfxqixvu28bfc *czb3e+ b f2-*6nm 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 sound becomes*pszcy2 e r0l ;ua*mo* 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 to n,)dmbd7d45ql mn3/l l;lazbne. What characteristic of the sound m /)5mdzlllq na 4nbd7,bld3;increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loud7bt z0ho1xw,m he2l)pness" 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 nic,j;d9j9 vye- ivs8g ote?

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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 water97lan 9 h6 j 1kx.mu1no-viwyz

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement waves aes 2s2jj(w x+e; ,3 u c3uokesvj/b-ihre

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider the standing wsmt 6j 2)0g0t4 hlrild olj77bgsbj1/wpi12tave on a guitar string and the sound wave generated by the guitbl0jb s 6j prji71il 2tt h lg1t)d7/s4m2w0goar 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 whiv7 zujj09r1v9m4ku bech 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 a83m xhmlyqt9 *b b: ,5nukq/xof length L. What are the wavelengths of the three lowest tones produced by this pipe:9h ymxk3lnb b tqa,q5 *8mux/?

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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 length L1(qbwiv /f7 u7itpwe c(xyg*4 is 200 Hz. Which one of the following frequeywfv / p(7q we(xi b1tu4*7cigncies 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 frequency. Which statcd-c eq,,u w2iement is correct2wu d cq,,c-ei?

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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 aq/8/jk x ek5llt 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 length L. What are the wavelengths of the three lowny4bv,wi.r.udnu h) :est tones produced by thi, w dh y)b4r.nui.:nuvs 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. Whi+l t8ow gc w:o(i :ful3)hchy*ch of the following frequencies will not resonate in that pig) hhoi3ltc y:l* w+wu(8fo: cpe?

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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 enw- 6 +7 hkun:0nprqvpy3 :yjakd is resonating at its fundamental frequency. Whiu3y k7p :h:+ry vnqp- wjn6ak0ch 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 dri,ax14crp/ ysh:pobcor/z l31ven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. Theoh:,b/p3pcys /x 4lo1 cr1zra 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 shoue:caw3 n+fmwz+o. f4ild 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 sou io(8 j8rennr3nded together and a particular beat frequency is heard. What happens to the beat frequency if the frn8jenr8 3(ro iequency 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 explasojk)af ;ysg mjn0, 94ins

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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 bf,4jyb1iv c .dy the observer isyij b,1dc 4vf.

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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 hea*/6szm2 *6 tets zmtq(0od kidrd by the obser i t6m zk o(zme2tsd/qd*t0s*6ver 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 bbc. ;/6yt oqodouble its MACH-speed, its half-angle will decrease by a f.cobtb/q y;6 oactor 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. Whda0mg+ ,e0 otgat ism+t0og,a0 gde the 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 ofx+b4tyr+y e 9h 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 isd q 13a5i7er3- hyujuy 340 m/s, a bat emits a shriek whose echo reaches it 0. qy37jr5dy -eui h3a1u0250 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.bpcm gi.p3btv 3-q3b :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 tl4xa4gac-9 jfnt;2gd o the lightning strik g -agax2jl;44ftdc9ne 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 fro.d c-,6mzt twgw 88aoum a 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 *s+hm6d pax7 34lg eea2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sound is 3 x* 7eap 63esdgh+m4la40 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 ss4i,)0g cyv h+ ho.tbpound 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 airbl3ik lifn-m 5o 2x*c,b.-sbm 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 intensvttxsvs1t6 5 -b w3v,rity $10^{-3} \; W/m^{2}$?

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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 sound?vhpt,rab)(zh(z)i ) :l d1okl

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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 levels of 70 dxxm x4 +et/;ypB and 40 dB/ m;xte+ 4xpyx?

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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 intef uh8j/zz/)8 zondk+v nsity level generated by onevn/hzj/ozk 8+duzf8 ) 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 distap938fbkayn 8 i2j ntsi+pb46cnce of 6.0 m from a source that is radiating equally in alpjb pb8 ai+3n48f6nk i9styc2l directions 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 df om :km+r*(3itblc+2ewpge dd+3 -q m from a source that is radiating equally in all directions i:-kwobc ft23e+ 3++l dreq(pm* ddgm 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 pivn-i(yf whwe: 9. *fassumed to be uniformly distributed in all directions. What is tfhenivpy:if* (9w -.whe 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. Whgoryt54 l lx3/2(z+wtd8p- wx vuce8xat would xcullptyv4xw o/ze8(d328tr5w gx -+be the 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 from a sound source the intensity level is 60 dB. l6 souku.7;gwx. avw +What is the intensity level (in dB) at a point 2.0 m from the source? Assumeuwgs lk.7u;axv.o w6 + 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 c6;a / /fynzc2e ow)zepoint source is 95 dB. At what distance will it be 75 dB?ezn2ezf6;ayo w)/ /cc

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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 m*f7h.j2 6xn2 z)r- 9 osnuwuqar.je cfrequency of 1200 Hz. What is the frequency of the foure 7-9o n6nj.q zcrx2frusj)2mw. hau*th 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 pipeibsyv;nsbz8 e/7p3nd 01(7 qwihte .r is 900 Hz. What is the length of the pipebyvzr7i(8 /qe;it0wdn 3 ss1pn7 h.be?

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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 pip6,4 xu 9 +p5v-a ee95tdmsghk 9sv2e*isxlzsme of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of lengtstvhei59x6x99emks laez 45u -vds p,s+*2m gh 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 0.8y r -1.ppnrv pqb+c nm /dn+ tx8p,j4+(o8cuyc0 m. If the velocity of sound in air is 340 m/s, what is the +,p ocyrrnxn+. v -ujc 41p8n8+c(ydmt/pqb pfrequency 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 is )b g*g-r k,zjaca d b -)8:6:l(j,ydr iuummhr$20 \; ^{\circ}C$. 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. What is tqu /(cl13l:uqqsbjy nfz.hh 3r8l*, ytool(( he frequency of the third harmons3ol/zlrh(1 ,fyjq. b((lu c tq nuo3:h8l *qyic?

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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 on; xgxlonr9 st6to( asfkgha ,5 c:;,(ke end that will have a fundamental frequency of 60 Hz on a day when the velocity of sou x;t g r((5clxo,fgsa9t knsh6k,;o:and 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 temperaturg we 0a7cow uj:h)3vp-e 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 i/ wrvm8d+cxi 4s $20 \; ^{\circ}C$. 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 02 5.px/cszw5kq(.smc8n nxu5i icz d1.75 m is played when the speed of sound in air is 340 m/s. What is t2 .s5 ucci5xi5(1zxmnk8zcsdn.w /p qhe 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: g2n-mk :* dbd2gnd:hd/s t czh4wgf18one is open and the other is closed on one end. If the fundamental frequency of the open pig d -h4dsnmb2cddtk 2:g:wfnh1 zg*/8pe 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 emrecs3k,j3t(f0v,te hit a frequency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in fronttrhjev( ,es3fkc0 3, t 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 frequencl 8 f s;gnzzg 2-m0p(hn2yts:pmj20njy of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person detects little or no sound, wsz(2ygnmh; sp00j8 jp m2-l:z n2ftgnhich 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. Wha2dfp p(vnztwk uu6cvd360 7 ,ut 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 fohxpz 5u0f3b y61p0pk krk to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequencyf 0k5zp0hb6ppk x31 uy 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 m respectivekr/ztqe:ev 8( ly. What beat frequency/t8 rq:eze(kv 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 w+b;b zfnv t*yb8b r i16 q1z;8w0bmottwo violins 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 thb1n+ftz86b rmwbqvtwy;8*;i1 obb z0e 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 approach28-gohq7xl3wmi)ndp c ) p xn-es a stationary 1000-Hz sound source at twice the speed of sound. p-73c- digw)x )mq2 8p nloxnh The observer 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 frequency of 1000s/.dpztawkof/ :: y /3 l0jdkq Hz) approaches a stationary observer at one-half / k0jwkdp f.s::y 3d/alotzq/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 with a speer:ei/ ) 0 )ezfx;plfpvd of 30 m/s away from the source, what is the frequency h)l:;ezi v / pfp)re0fxeard by the observer? (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 sirj/ ofgw52+0dvdjms 5g 0va qjnb,cy *+opv1-ien. It is traveling at 35 m/s on a day when the speed of sound through+im v55 o/c0j,y 2 fgbgv1+wddjvj*op -qsn0a 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 stationary observer when a trl81q62 k*riz*: sjdw3twg aheain approaches with6*w jd tkileha2sr q*g:w38z1 a speed 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 toward yq bu:. ++pn-6csa(,lgwg dft bou at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What freques bl+g(ncu,.q wgd 6p+b t:fa-ncy 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 121x5 ih*q0twdg)4 qlg d0 km/h toward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound gqg*4tdh0l 1dq i w5)xto be 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 blows its 400-Hz whoqpjkf: f/n1r s)4f9 1epz h6nistle. Take the speed of soqfsfohpr/1fjkp)6 nz9: 1 e4n und 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 km/h. It .szt mrv- 8147vn8hgm r,fbtx 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 vt f,14n r.g-h8xt s7 mmzbrv8frequency 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 tm8s8,5wjhrrg+ rqy2 p7+mpoprain horn is 500 Hz. Assume the speed of sound in air is 340 m/s.qpr28 p++p gr mrjs,w5yo7h8m What is the frequency heard by an observer 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 train horn is 500 Hz. Assume the speed of sound in bc yilvw:h99 9)9 j7oxjk+8tahhe0l r air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a sp 9yhhw0ox89t7v9+ l:cble h9rj )ajikeed 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 senttpl (qpl8g,( m out, and a 42-kHz signal is returned. All(pgtp 8,m q(ssume 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 shocr,:w6wix 8yi bt b:jctqx 6 r*8py.k:yk 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 speedd;90xi yvpy7pj j8v0 v8ll yr0 of Mach 1.4. What is the half-angle of the conical shock wave 0yl xp088dv7j 9rlpy0; iyvjvformed?

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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 numbekt crcb4;ibb9q;/e9 d r of 1.05 wheree9 c;;bridbkt 9qb 4c/ the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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