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习题练习：Physics Unit12: Sound
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://autoconfig.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 70，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://autoconfig.51fly.win/test70.html  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。
 作者: physics  发布日期: 2022-09-26 09:56    总分: 87分  得分: _____________

答题人: 游客未登录  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 statemf nxr2k gf0tp6qc906qent?

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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 c8u tcg)u9eb1j onducted 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 steel r27jph bsf8:t;epdup * ed6s6 tod?

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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 increa6k3 do rndq:+kses, what happens to the velocity of sound? (Assum3 d o6krd+:qnke 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 400 Hz sound, the velocity of a 200 Hz wmt1yxb 09yhmzbr967 sound through y6b91mrw0 b7myht9z x 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 g-55soahqm6 rc s34 sx/wm nr9a 400 Hz sound, the wavelength of a 200 Hz sound in air5cwas r q-gr3 h/4m69x5o smns 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 are cv4k 9caw1da 4ralled

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequnv. ;ftf( psax3e *6geency less than 20 Hz 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 uniformluqlx x1ux 2,,ny in all directions. If you move to a point twice as fa2xxq nx,lu1 u,r 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 is proportional tottn(5m(8h yig

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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 r h+xnfi8t hc8- )lqpa)y m4,rlof- l(source at a distance d from the source is I. What is the intena+lr( h)f4yfxl)-8 com-p lih,8ntq rsity 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 x 7jm9uwrgd;r)q/8jdn 2a wk 5radiating equally in all direckjw /r q9ndm5d2ru)7 x; jga8wtions. 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 s+hau0xyn - /gf)mv3h sound source that is radiating equally in all directions. What happens to the intensity level of the sound? It dropxh ms+yvga3fn - /0u)hs 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 so mse8;qnn hb7e, h2tp1und 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 tonq0 vtg9 ocmm6h2yk8i:3clm q-e. What characteristic of the sound incrqc mmm9khgo06l: v iqtyc2 3-8eases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" w*r o,dgca4jrl 81h7fz se6q: 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 note?oj+cuwrm2 0p6vp5xs k*7m5pb

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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 wap.(fzlv 6; yyxter

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement w+hpvf6 b+cl,rb .czm 3aves 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 sound wave generated bciff.sd j5 5h*y the guitar as a result of this vibration. What do thehf5jisc5 .fd*se 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 gx0g r8.oo(y5o xlkp5 which 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 wavelengths of the three0n4vd-yw xg/mrf4 nx, lowest tones produced by this pi x-xwd4 /0,vgnyrf4n mpe?

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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 200 Hz. Which oneoshk19 5b vv51phig8f ofpbs gfoh8vki v5h1159 the following 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 its fund uzhiti fy-tp4f:i,( h/bs/vmrl6(+ramental frequency. Which statement is cmfb (ui st/ilrtv:( -h hi4y/,p rfz+6orrect?

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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 of uw uib3xf/.4ne 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 m8g)c.) +wacw( dfup b c/i/reof length L. What are the wavelengths of the three lowest tones producm8w(/ c)w iu pd)b+ef/. raccged 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 resonateudtxwj f we+*7yjr (:9 in a closed pipe of length L is 200 Hz. Which of the following frequencies willju9 w7f*wed xt jyr(:+ 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 resonatir )ui 10roxuruo- )2tmng at its fundamental frequency. o-m2u10ur )t xorr)uiWhich 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 thew xe3/hll/1 ez 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. The1 3z/eex/lwhl 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, th 2fpb q0l-rw at84ft-ie 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 and a particular beat frequencehrodflqjb xx 81 4k.1e6;rx(y is heard. What happens to the beat frequency if the frequency of one of the toek6fx;.ohq41 lxdrr 1b(8x e jnes 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 explav 3e2m s(j8zp-h*xccwins

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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 sth*q),9dcs orsmzxm9qd8 -v s+ationary observer. The frequency heard by the obse9dzvm dsc -rsx* q)o, 9+mhsq8rver 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 fre2 eoe 4z37r)s6boq myy 3h)nw.kssu)b quency heard by the observerweks.y7y)q)es2 3b nr hs46)3o bmuoz 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 ny1g9 i20 qrecits MACH-speed, its half-angle will decrease by a fact ircq12 yg9e0nor 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 o tg 5)m8t8atfi3bcf; frequency 45 kHz in air is 352 m/s. What is thf8o) i; 3tgcfta t58mbe 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 of the speed of sou/rg7vw5h t gok dlh 2jc:*yz:a04,px fnd 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 spe-u (nckhb 4x h4bzb9b4ed of sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that r4(c44 uhb khbnbx-9z beflected 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. /guj- e(p uqz3 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 yta rfzj5 4hso1 w8sk82-ywp, p mq)8fseeing a flash of lightning, the distance to the l ,wz12-8)fatsqp h458syjrfywm8kpo ightning 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 s from a cliff on a day the tempxpd27mut fj5.erature 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 -z- m1+ sogi l;mjw3widxz-e)deep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sound is 340wo-+z--3sdgil zx1e; mw)ijm 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 ete0;cyi d3v)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 at sno ;iapb )jvk,u:57c5-hmir $23 \; ^{\circ}C$ 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 inte n3.rnzq(-hcv ,6kqsxt aj9t,nsity $10^{-3} \; W/m^{2}$?

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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 so*o s13xb lwcl-und?

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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 inte8cbfvr n zd6--nsity levels of 70 dB and cr8 znvdfb-6- 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 7i yy6n vn9(dnkyw(/kis 100 dB. What is the intensity level generated by one engine?k ni9y6(ywv 7dknn y(/

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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-ee dd *-+(h-1s v :jnvev nr-xed5ntd.0 m from a source that is radiating equally in all directx:-(nt5 erjndev nh- eddvdv+se -- 1*ions 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 ibmx3n08/id-z nibs/2hi : thv ra:f7qs radiating equally in all directixh mv7zf: nsb38/i -hi0 q2dranb:/ tions 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 abo3qd4yt4w. :36bb q +eaw hvd tov8gxc6ut 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 fo8gb qwbd: 44vtc3+e.wy 6v 3dtah6qxrom 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. What woulv4a s5tem ;i n*4 rdb6-bw8vhtd be the intensi 5vb4*hr8sd;-n m tbtwv4 ia6ety 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 s2 -hdp- l ()jqj0, aodltj8alg tex3c p1j15afound source the intensity level is 60 dB. What is the inajoltp(f)081 xj25 d clej3jaa h-,p dtg-l1qtensity level (in dB) at 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. At what d nu+,et zav1,sistance will it be 75u+as,, ez 1nvt 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 thngjl +x7o,cr.e frequency of the fourthnglor x7j.+ c, 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 ,-8p9:tzse qvepi +luis 900 Hz. What is the length of the p ,vt-+ qip:8s plezeu9ipe?

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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 open7srca7ude y)/ pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in a er7 /7u)acdysn 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. Ifz1 ,w 2/ndgm9 g3f9dlh5v bnvn the velocity of sound in air is 340 z vvfnl /3wm 1n95gd,92hbndgm/s, what is the frequency 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 aa nzkk(i 441vc 5zhuu) room where 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 is 330 Hz. Wha722 lyg b 4jaqy c.rhrf,7p;cwt is the frequency of the third harclf2ayw4hc; . g jy7bq 27,prrmonic?

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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 onf c ;1a10(nyzbvdx9oy one end that will have a fundamen( 9noya f11zcb yd0x;vtal frequency of 60 Hz on a day when the 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 wheuj6njc3 hx o*,lju:/q83 awlpre 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 i u9p nk;7gdoey/je8 9wn a 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 plachq)o o/btps dh4u2 1u+vrvh7bd 9,v 0yed when the speed of sound in air is 340 m/s. What is the fundamental frequency?7bv othp0v vhr oud4dq1+hcu/ 2,)b9s

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two pipes ofx* z+zhl*,p ir :ivod* the same length: one is open and the other is closed on one end. If the fundamental frequency of thezohv*i+x,lz *r *p:id 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 8v t/ bwe/v8wda)lv o6of 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 front of t8lab6/wwo/d vv8)vet he 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 placedsn s z9 1hu46w00qomzza jr;z* 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 u0hsza*w r;qj9os z61n0 4mzz 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 frequencieso0: d jwv).+1c 6 pzvca3jndiy 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 tdfr 8v1si74gg6xu hrwkmj:) 3une the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is th36xrg)imd1 v7 gwfk4:j8s rhue 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 ;os*jvx l+:ee respectively* ojel:svxe +;. What beat frequency 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 two violins in an orchestra are f3u 63f 3s evpz*,a5 et,l2u5keidxkns ound to produce a beat 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 thspvk25 sf*3u,6 ual3tn eze,5 exikd3e 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 station rca4udwtj9 1fq7fh5+ary 1000-Hz sound source at twice the speed of sound. The observet4f qdaujch 1r+57w f9r 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 (normanlg 5f(e7hg:uv.l4 wtl frequency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a frwgel7 h (4: .fvnlgtu5equency 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 spee:jxg9by/n(bp9wt 6 c nd of 30 m/s away from the source, what is the frequency heard by the observc j/(:tnp b9w6ny9 gxber? (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-H tjr2 pcy1q;pvq c85hds4d7p nm7 .r)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 alt)nc7 djq2 5p ;p7dr14 qmvh8rpcs.yh ong 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 hearklpq2 ,o+-h v 76tfd3)hsohyhd by a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train hood3o l-h76ksqt h2hy h+)f p,vrn 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 travelingg 3fnw45:fhp29c zvir toward you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. wgc4 f:vh9n3ri 5f2pz 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 trai s45i:ym6i:ab 4ym hl+t9avp cn blows its 400-Hz whistle. Take the speed of sounc5+ya4isa:4ih ym bmv6 lp9 :td to 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 k+v s 6 p2q+cl(noc*cdld /35on) fzedjm/h. The train blows its 400-Hz whistle. Take th+ dzl ps 2*c5jlc( 6dnd/o3veq+o c)nfe speed of 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 km/h. It blows its whi-o.5ja mxdqocj7fx(x d 3 mk8bfxy)- /stle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual freque37y f d/bjj-oa-mx xxq5m.o8ck )xdf (ncy 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 horq2ejt e5 rmp/*n is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is movingr*q 2e p/j5mte 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 airnn3u: lzbirlkb i .+,- is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speed of 30.0 m/s?,rb.i znku3:inl+b l-

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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. A6xuc-:esh2 39 iyyttu 40-kHz signal is sent out, an26-:s iuttxhyey9u3cd a 42-kHz signal 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 produced by a su+ ,cjabnai6lbz* 1 vwj/+6 onff4en ;igpyg4)personic 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-anj:cr3btz( f+ o3j .esvgle of the conical shock wave formee s3jrft:v (zc+ojb3.d?

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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 t-j0mj+l*+aqjwa n c+v42klejhe United States to Europe with a Mach number of 1.05 where the air temperature2 ej04q-n*m+v+ kwa+acjj ljl is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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