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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 statemen;yy/pge dgo(4q42t lpt?

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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 fxfk: eiei4 8,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 of8pvr40 r7 qu lhhp6o9m sound 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 ainwt:zdp :;,o.b)hgitr : p,lrr increases, what happens to the velocity of sound? (Assume that all other r:t.g):b,dphw ;p,l oi:tnr z 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 velo)l+b0zohsxp7jh86 * :uzxc -vjay )m-y hmf: ocity of a 400 Hz sound, the velocity of a 200 Hz sound throuo8lho+7vx zzm- xbp huh-60 j)f:)s:cayjy* mgh 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 400 Hz sound, the wavelength of a 2ury qp),wq:p4 00 Hz sound inqrpqu4wy:p, ) 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 thj 9hfp*7zv.al.xm3 js))us-b* ftec wan 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 7ub/c b 8g:l0vg aloo4o+75wedo(u1hbnz o6bcalled

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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 sourc1q ouphp6 k9 dcvd2g50e is emitting waves uniformly in all directions. If you move to a point twice as far away from the k 0ddh v6pcq92 5up1gosource, 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 propok; pgq-qr*f7 jrtional 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 z js2od69aoe0 (* 4imvivswg( is I. What is the intensity at a distmjiv9sd2 w((i40eoozg *asv 6ance 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 zf- r jlmg 3(rs.+dedx80;(kpb t-lqmthat is radiating equally in all direq(( xd.kf+ p ;mtlm0d- g3l-ezrsr8bjctions. 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 radiatxvbm)hy thz5a 9q*. w(hh36k 6 7odtqjing equally in all directtd(v a3)hhm9zb * qh.jwyh 676 q5koxtions. 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 souyxwk0awz 4pyt: 5lw+ eb .c(q3nd 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 pure87tq / vtbo4jaw73rs buk79wc tone. What characteristic of tc /wtbutoa8 79j77wk 4qs3bvrhe sound 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 musica3ei 2,4vhuw iihle2xeh 7 :qg6l 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 aepa /g o a94c9z4(5ntpo: chjt 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 from10 9lev8n htqv 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 wav4 8f;gnhw/pyvypuufa1,+ z m5:(r e1 hlc,feqes 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 the soufvg .n 7b-cu7knd wave generated by the guitar as a result of this vibration. Whatv. c7fkbun7 g- 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 which is opkdt4dbf a2qnn1x 3i+x:hef, (en 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 are4(o3k m/i;,*azp 0 bz bxtxvcf the wavelengths of the three lowest tones producevf3z /x*i0;b(cpbkamxt4 oz ,d 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 p ;hr/*eh7w(*kpa) z k*eyauff ipe of length L is 200 Hz. Which one of the f uf7har) fpy* whe*ke *a/;kz(ollowing frequencies 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 it5/pj1wl:mzbk s fundamental frequency. Which statement is cor5 w/l zbk:p1mjrect?

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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 cc69d/ z ak(:qsit7qx)bgs,ah 8i m/hopen 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 ofelew04jev(f 0 ;nobf- length L. What are the wavelengths of the three lowest tones produ;ve0n w(e-be4 0lff ojced 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 d3-t y6owkvooie 8a6tl8k h32. Which of the following frequencies will not resonate in that p3tl 2k8h3w oo6vdaeyi-6ot8k ipe?

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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 resonyxex1lgp+v mf4(*s r t 7(vx:gating at its fundamental frequency. Which xv*1vp+(4gr f(ymgs lxx:t7e 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 twod0p vz n ip9ru:)d:z3x6;qdb o speakers driven by the same source. Each speaker produces a tone with pdun3 z)q:p:;zvrdidb0xo 69a 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 o4p.w,qw(4 xdk rx8y u;9ksrftwo 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 and a particular k6olvyxz y9zw r:iqh 019l+lv8g3 k2r beat frequency is heard. What happens to the beat frequency if the freqlov+rk: hvk8 ywxyl9z 3 i09621zgrlquency 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 expla)if3z0 s*5x5:hxpovu pq cr 3cins

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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 observe:-1w rxz/ztdtr. The frequency heard by the observer isdz1z-: /w trxt

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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 frequencyull ed it vpv8u.9l./2iuzy39 heard by the obse.v3vtl/l dyu2i 8.u i9ulpze9rver 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 will d(48vkt7qa5u pvema/s ecrease by a fe/asvv5p4au (m7t 8 qkactor 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 soub62(bfzow9 t wmfqc.am:e *-l nd of frequency 45 kHz in air is 352 m/s. What is the a o(l2 bqcz .e-fatwf:m69bw m*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 wf4gi,qd/9 9ljrx- / 5z+ar q9pecbppof 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 emits a shriee( 6l wy;5c.msyorfr)k whose echo reaches it 0.0255yo )rsce(;fl. wm 6ry0 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 tbw; e.2(opd9e-n gigkhe echo in 4.00 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 flashc)rg/ko6gcym4 ;p k5r30yrz x of lightning, the distance to the lig4o5yr)gkg6k0; c x/z3 c rprymhtning strike 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 cgc5o9,dqfn yn, 1vk l3y 6jurkm..6ss from 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 splandrnt a* j),y4yh5z8 aih7zt5sh 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sound is 34)5nyh58az *7t,ajhr y4n tdi z0 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 oq s3hv5 e2mo58*dwop6i (uz odf 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 nl/5o)mq u1+ j3ubxapat $23 \; ^{\circ}C$ 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 ay *wr5mnjj1 a3 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 ywd2qn5 vcr9 4a 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 with intensity lee:bapub2a hxl4/v.c ) vels of 70 dB a h:ecv)a4 l 2a.xpbbu/nd 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 intensito x7ea f 5+sr mq(af,7yx;ib1xy level generated a a7yrf oxx e;x1(m7+f,5sibqby 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 radv zob24:b23.dcma * ivibw,jz vu4r 2pr88lcr iating equally in all directzrrovbz: p *wivbrl, b 8v 4mj4a2c2c2.du i83ions 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 c33+y/kwutsx9t 58s8p lyfxk0u fxb( m from a source that is radiating equally in all directions wxs3 tbc088 kfyx5y 93u/t+kpu( lxfsis
$6.0 \times 10^{-10} \; W/m^{2}$. 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 uni1z+v8wu0m 8l )l s8ztalko.d nx+ty*nformly distributed in all directions. What il ak l.zt*v8xwu0o zltm+nd n+1 8y)8ss 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 bn.4 7a(chrl la distance 5.00 m from a barking dog. What would be the intensity level ifb( 74rllcnh. a 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. What njogc. gkc e:g/hkei 4(+0 2ghis the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equc:20k.h /gog gineg(c je4 h+kally 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 frl7a lj3: puq+ y-hnh:nq 0gl)j*iu7mfom a point source is 95 dB. At what distance will it be 75 d a q:70lqj-l 3uymgufn hj:l pih*)7n+B?

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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 freqk wx7r b9*nk9r7/ fqnvuency of 1200 Hz. What is the frew7kqnx n7k9 b9rvfr* /quency 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 harm ++8db7ne /sd.n w8k7 3bzyzzgrxy ej(onic of an open pipe is 900 Hz. What is the length of the pje+y3(y ezrk. z8n78gdn7xbzsd /+ bwipe?

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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 they z8*69 vkszyp frequency of the lowest tone that will resonate in an open pipe yz6 p9kzsvy8* 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 0.80mjbokuf 1*6p1i f 9khqv (t.1f5 zgf4k m. If the velocity of sound in air is 340 m/s, what is the frequency of the second harmon zp11 k .ob q1k(kt5mujg* ifffv6f94hic?

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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 temperatuma*3zhl ay/s)f /.t d50 gaejjre 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 is 33 yzvi +:m0l tylm)wre kz/06a.0 Hz. What is the frequency of the third hyi+ wm6/y l0.ae:t0klr)m zvzarmonic?

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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 thx;t b8joj0- s7vk-c5mcy;cmeat will have a fundamental frequency of 60 Hz on a day when the velocity of so-bvc ;y-mkc;0cm5e8xj7 osjt und 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 wherlrgj2 +r ,+ qr:yta:ute 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 room where the temperatur5ekd(tv2w5 ci7i ypw )e 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 pla+d 9*w-jlx 5bne7 ylrkyed when the speed of sound in air is 340 m/b9*y +lexlrdj k7 5nw-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: one is ovhe38lwjq; u5 pen and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of the wj58eu3;h qvlclosed 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 jyy d hjf68 x;o;.x/5fiknj2ovelocity of sound 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 j x;f 85 2khndyijyo.x /jf6;ono 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 pla 21mt d;lb-mgfq.pms)8 ;lwleced side by side and driven by the same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person detects little or no sound, w mw-1 2lel;tq8d fbm;mpg).lshich 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 frequecdt-6w l9ag8xf2wzh3 ltuw .s(p8r2 mncy?

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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 vuqq:(n0o3n b a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of t nu:q bvo(q30nhe 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 soundbf;xm7 r;p m) hanb.4bs produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are soundeh;mb74;bmnxra) .bf p d 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 tq3sn h3q-;u1 jqxin6uwo violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentaxi3uq6qn j qnu-;3s1h ge 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 speed of sf-9ctgv q0(lfho 73s wi;mdj,j nu1p6 j untq3 ,v9f(0fcm6p whdj7-si1 g;ol ound. 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 1000 Hz) approaches a stationary x +k80s 5ay:1d5wta o(qyz qv/zt:wwxobserver at v0xt51zw:z+wqx k sw q8ty/do:5ay( aone-half 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 frequevf6:3wje6 d 2ol ub,wq y57wd5yv9gme ncy of 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 3 d3mv:l ,bveqewg2u55w 97yojwf6 y6d40 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 trave .9amblt2lm0b ling 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 stlt 92mb.ab lm0anding 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 train approachdyt (.+.j2ucve pu5ojes with a speed of 30 m/s. The frequency of the train horn is 600 Hzyut.edjo 5.p+ (2cjv u 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 you at 120 km/h. The train blows its 400-Hz w6lrf3n6o 5bjkhistle. Take the speed of sound to be 340 m/s. What frequency do you hea5nrko ljf6b6 3r?

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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 tra jcq7x 8q1ahy1 dy1iar3-srw8in. The train blows its 400-Hz whistle. Take the speed of sound to be 340 8 hq1-s7xr38y iawq jca11yd rm/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 12h.rdtj(yp( r v:7r;k t0 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What jvr ; k:.t((rpryd7htfrequency 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, a .ib 3m m6gdtw5kd;vl/nd you hear a tone of 400 Hz. Take the speed of soug. mw/3ltd5vk; i6mb dnd 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 horn is 500 Hz. Assume the speed of s,v; rqi all3-gound in air is 340 m/s. What is the frequency heard by an observer if the observer a ql3 ,ilv-rg;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 trairwha -er/ z-zl8k i n0be9d5q(n horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What h0z9qi r z-wndak5/er-8( elbis 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-kv 2 27:5trkaydcla rj;Hz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. Ho 25k;c2:rvtaj 7aryld w 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 produced by a supersonic aircraft ie9i2u*7zbdnx/zw 0 mr s $60^{\circ}$. 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 hesoo)u s)y7i-alf-angle of the conical shock wao))so- y ieus7ve 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 .4 04izm1g+zrnfl- .axkubx hStates to Europe with a Mach number of 1.05 where the air temperature u.4z.lirzm k1+4f- xa nb0g hxis $5.0 \; ^{\circ}C$. What is the speed of the plane?

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