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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 fs x 0p)hm,i bo8xo+dn4alse 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 condu a+*/4h pe i3igsed44hxg1cq* nhas8ected 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 st5wo*ihii fu/*fem8r+ - symo +eel 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 ob0+ 8sx grm:ktf sound? (Assume t:0t rk8 sgm+xbhat 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 soun8gnr6hb)bzug *9va wy(g 3b29z syfz7d, the velocity of a 200 Hz sound through airb*rfv8gzy2 ny au 7w)hg6 zz3sbg 99b( 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 r/gsx.c so rjj0g 61g*f6eo(l Hz sound, the wavelength of a 200 Hz sound is6/c lj 1seofg0ro(.j6rgx* g n 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 frequen t 5iwef6cw+d eb*52zqcies 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 ar39n3a jg- vkm,embow()ly4qoe 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. If yp3 e4+ :e2,k0kz vlybqn gysc7ou move to a point twice as far away frzs7 p23q eey k+ ,y4ckb:nvlg0om 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 proportwz oyeq)e +bz 70lo ,53smio;wional 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 I3m;ho b4/ 5 duu2dzseq. What is the intensity at a distance 2d from the source?4h3eb25d m;ds zu /oqu

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distancew (oon7w u;bnr(.jt 5e from a sound source that is radiating equally in all directions. What happens to the intensity of tht b5jo. nou(wwe7;(rne 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 al 1.7 qrjz*vre nmm.(from a sound source that is radiating equally in all direction ermv(71zmnr*ja q..l s. 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 ac7:f;fg xkbof f)ivo vk /e91,eja:s:s 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 towar)h;kigpkd *jx3nx. 3bd a speaker emitting a pure tone. What characteristic of the sound . ip*kn3)xgb h3 kxj;dincreases?

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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 noh r8t (nxw ;fim-qq+ e2w7xjm4te?

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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 mu)ou huyi9u)v. sical 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 from air intop 6f4irc api-, 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 waqw u.ri50awxu (yeo+1h ty 4)wves 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 strivk(,u(c7d,q:axmg( r wm5mn mng and the sound wave generated by the guitar as a result of this vibration. Wha:(vc w ku(r( qx an7d5m,,mgmmt 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 i ji2iep sq hq.l*oypt,vy;cyp5xr7m7 4o78 0which 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 wavelengt/3pt :6yv/ xzpmpyoj.n x sss2a-z *+shs of the three lowest tones produced by tov6yy2x st3zs pp-s+mxj*s:.n p//zahis 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 length L is k1wy8 pz10vrhsjh2h up 7/n2 w200 Hz. Which one of the following frequencie y2v71wh w1np /2 uk80sphhjzrs 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 frm8pi*kx:)lwp, lop8 o equency. Which statement is correct,m*):p pllwoi8xk8 po?

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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 closed at the2/wq g6./bt 4 8y3tumi oz but66znaue 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 :bj dqudo ;o0vkxb*4 0of the three lowest tones dov0xj uo;q*b0b4:dkproduced 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 20 zqa*l+f 0wze40 Hz. Which of the following frequencies will not resonate in thaqwfzal+ *0ze4 t 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 ong y+gi59xlx+ ue end is resonating at its fundamental frequency. + ly5gx+gixu9 Which 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 s7 hhhsd q j8 6*unsq-)l4d5dxaame source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound4*d5xh6s7-a8qdd)hshqjn l u 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, t: acq3 o4 kbl0am6.bpwhe two sound waves 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 a gw ksg lp c)a5xn;sui,jf(18-(,vgtind a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of thevg k (t8lsufws5(ig-1,igxja ;,cnp ) 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 explaina (zc5qr)oal-ndy :- vvr ):ohs

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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 mh9gxy6h19pc37 w cqdk q3.w jthe observer iw9q3gphh.jcxc 7kmd3yq6 1 w9s

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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 fbs hpa3k rb0. jo(57mqrequency heard by the o3q7mj(k rba5 s.b ph0observer 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 will0j6e.3ki,*owx qd dr+vrg/ ti decrease by a fac*.irkiq+d j,od3xegt r/6v0 wtor 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 c 700lg)wwcv nsound of frequency 45 kHz in air is 352 m/s. What is the air tempe0 vwc0ncwl7g )rature?

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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-u n3hm k*2wkn2a4ugk d2l)ei 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 spaaeu*b(x i3 0eeed of sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. ex0(e3 aai*u b 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 tempehumnryer q8+* ( 0g.lv:uh2cyrature 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 to kn tnz9k-:f7 5z4nrzxthe lightning strike is aboutt94fr 5knzxnk-:z z7n

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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 th dujuvp7cck- xd -a8/1e 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 )li uz12+ydg dwell and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sounddig1)zly 2 +ud 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 frequency 500 b8hu3bo 9c krl6zn(ujbwf :) 1Hz 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 ai 3 er:edjd4: 8k x/ajqchsfm(3r 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 sp.uzr lpo94p(hzs 1.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 a9rdeh ptnzuug(,okt/ hqz.2+ 49+vvr 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 sounds withb)x4g7 )zi; yo0akd ej intensity levels of 70 d) 7e;i0xkdyz) 4gab ojB and 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 intensijt8bticn e d. )epg(kt2u*dr)6ng)/hty level *( n.) jepk8c6n)gdhettdu irg t2)/bgenerated 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 radia 9p3/i owk5ygmcbbgn34p o-0cting equally in all directions is05my-ig c b bw3pp93o4gko/ cn
$6.0 \times 10^{-10} \; W/m^{2}$. 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 di8nj0 5iuo nte)ls6zwb( y3c 9hstance of 6.0 m from a source that is radiating equally in all direc)cy 6uzj58 9ontbn sleihw( 30tions 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 delive6kbw3gxc4k y yh, u.d j(3lhc/k)n3yars about 1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m frokjygk , (b3wx hc6yad/3.n yh3lk)cu4m 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 8f.nbm pspfius*,8s )barking dog. What would besnis .*sf p )8pf,8bum 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 i* rafc;7 56vndp w-b4hfr3t yycr(5s zs 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiate-rc( 6c4b;5 ysr*w 3r dz ffpynvta75hs 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 frc 2*0aeo, wpjpom a point source is 95 dB. At what distance ,aeo pw2jc0* pwill 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 +5ec.na0 p*a ha.,orss1k djlfrequency of 1200 Hz. What is the frequency of t*ao,akhs.l+p0c j 1asde r5n.he 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 harmonic of an open pipe is 900 , ww uy7x7vuy*5sd-fbHz. What is the lengw *y-y,77uuvsxwfd 5bth of 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 length L is 400 Hz. What is the wyevuv8 8a 1a7a6 6yls6ha;ywfrequency of the lowest tone that will resonate in an open piaway7h8ay l6ua6v v;w y8 se16pe 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 velocity of sounom)d8 fm::ut;c, pg4*ft ir f sc-eqb/d in air is 340 m/s, what is the frequency of the secgqfmtm)ci- 4* bo:f,pce:/fu;r s t8d ond 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 thnza f(n:t /yd1e 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 i;k t0wbhh 6/1zacgu0 mb3r(y5gv pg8 nn a pipe closed at one end is 330 Hz. What is the frequer g0y1/8tn g35c;mpgz6kbw hh u0vb( ancy 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 pipe closed on one end thw 5p zpue (;.h/hkbb-rat will have a fundamental frequency of 60 Hz on a day when the velocity of sound is ;z. eubpwhr/ (hkb-5 p340 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 ia,5z /j tit26uiah2 i-jt2 qqns $20 \; ^{\circ}C$. 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 ry)0i( bpq3,a qiy7k ltoom 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 ord;g6s ms2)awkoi ;; 4v9gtx yf length 0.75 m is played when the speed of sound in air is 340 m/s. What is the fundamental f;ogs4vx)k ;y g6ts;ri w29dmarequency?

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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: gw 0ips e.6+bsone is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the funda6w sp bgi+0.semental 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 pply6 n-)bz(z3tq:rfho f pp(4; z ad3frequency of 800 Hz in air where the velocity of s zh ryta6d;f)fzp4np ppb(lqz3-(o3 :ound 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 sameah7gu1 +krq t8 frequency of 500 Hz. If the distance from a ph8 uqt+g k1ar7erson 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 frequenc5y4j(xq/nm q nies 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 frequency of a musicahrd0kkxub:)77n wbu -l instrumenb7)d xr7b:k0u -u whnkt. If the tuner 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 m respectivell; )tvrix y5uuv oet,d*0e(x:lq5s 2oy. What beat frequency is heard y*r25e x ;xeit)o50ul o,:lduvtqs v(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 are fk- 5ucmy7t+8 tq 2owrx0bbs wt;,hbfz 3)bhp: ound to produce a 7so;0zb-xmtb 38 , t+2b:r cp)wtw5hy qbk uhfbeat frequency of 2 Hz when a frequency 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-Ha388:)aa7-wvo g fzmof ;5qrf w weajkj)b6j0 z sound source at twice the speed of sound. The observer hears a frequency o awg3fa6: k;orj7af)qjf -8je) aw8vb z0wm5of

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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 stationary o 5al4eiewfq0sn ey:b ep-: /m-bserver at one-half the speed neawme:-0 5bi - sep: e/qlfy4of 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 move mctvs hrq *cp9h3:2xw;(f.tymn 5f+x s with a speed of 30 m/s away from the source, what is the frequency heard b2thw:hc( p;3*nfs .m9f m+xyvqrt5 xcy 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 siren. Ii+cbh s+ci6 )ymjy02 at 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 6 0+2ai) y y+ichmbcjsobserver 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 wqu)gsk2xinmd*-j .a bdy ;wzb7d *n36hen a train approaches with a speed of 30 m/s. The frequency of the train 72 3dd;iy nmk-q6s) ng.zdwx*abb*ujhorn 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 towar+ya z lmrno1(np -3b8bd you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What 3p (mb1-raz8ob+lnyn 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 staxn* d3, auq m.azyvk(;tionary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. Whxku*. ada,; nvy (mzq3at 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 trb 3k h5 kaq1l-c1chp:main blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequencyhmpkbh1c:lqca5 3- 1k 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, andkpd03lx-tgda--ao+ yr,vr1ah dno45 you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequencdad lv4 h ,p --3oayrn1tkag50r x+o-dy 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 H )nz.pws0x g7h oqpp)y.k )f9h r7cp1pz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from0 gr9spc 7.wp fp))xzkph) npoq. 7h1y 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 wo /qg/5kn:l2snb upimez 090 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an obse:ki 5se wzm2b/o/q9lpn g0u 0nrver 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 signal is sa24fcy iw9qx6*hte7p ;0vlr vent out, and a 42-kHz sig0l 6 yqevvcw*p 9a4 r2f;ixt7hnal is returned. Assume 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 shock wave prod sqh4c5 +tna,yuced 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 half-angle of the conical shocn,31(ssarhv y k wn ya1vs 3srh(,ave formed?

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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 Machy5ba*clal6 +n number of 1.05 b 5a6 l+nlc*aywhere the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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