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习题练习：Physics Unit12: Sound
本习题练习试卷来源于无忧得胜-网上国际课程 (https://5edu.win)， 为试卷打印版，您也可以在网站平台(https://autoconfig.5edu.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.5edu.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: admin  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 statement?bl:1 ia4v u(wj

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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 conductw;fnp wa9+g/+p rtb l)ed 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 s7 jxkk+nqh oa.6eu. a0teel 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 ha kv aqa-go4o23ppens to the velocity of sound? (Assume that all other factors remain constant.voag34 ok-2aq )

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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 H;9y2r za3d(7dxuys h8q6 qw kfz sound through aiq qz2ydr7( 8xf;hasud6k yw39r 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 wave-n-n 3hgnkwu:sq z azw-3 (r:tlength of a 400 Hz sound, the wavelength of a 200 Hz sound in air ia3: gqz (wutz-n k- 3w:-nhnrss

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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:b+v 2d;twx f7vvkk m+,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 gttnw-- u:vy( 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 uniformy:*h)ec /gnezly in all directions. If you move to a point twice as far away from the source, the frequency of te:z /gc*en)h yhe 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 propor. k,jj 57jq hkdsol94vtional 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:6 kukh g.7glc d from the source is I. What is the intensity at a distance .gck guhk7l:62d 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 k g)+g;mypek )g-z+e qall directions. What happens to the intensity of the sound? It -k )z+ )gpygkge ;+eqmreduces 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 raw6n)xsz.5xfkdis0 v;( h yo6 kdiating equally in all directions. What happens to thosnk 5w s6kyxf)i(z v .6xh;d0e 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 increasevko s2z u9-gl 5/:ebk5ktndo0,g-b- wf-ijks s as 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 toward a speaker emitting a pure tone. What characteristic of,,tms.o -2 oqlp3edkelb y: .m the soupb3metqdk, ,smo. el. l2 :o-ynd 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 musical nor5vm4 8hb jh3vlgo5 3ote?

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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 (knhn *j:9wx.dwzr:m?

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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 watp (4crlt9ozr oj*ew2; er

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacemexo w)fp) 7scjsj98 )aant 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 ona)d)4i4n lwoe a guitar string and the sound wave generated by the guitar as a result of this vibration. What do these tw o )l4)dane4iwo 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 open at both ends, th9 p r1xhdny* )f/wvd0tere

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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 z6hd1 h0gs9hp of length L. What are the wavelengths of the three lowest tones produ1h9zgh dh p0s6ced 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 of length L is 200 Hm+zc 3 (e tsah4qp(hzl6ke vt;4esd)4z. Which one of the following frequencies will not resonate in the h zdesap (e6tls()qm4t;z+ kh3c4 e4vsame 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 fundam/*y;zb(ju;x 1ik rghiental frequency. Which statement is corrxr 1g/;(ji hu;*b yikzect?

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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 (r87rb3d m4glzib17drx6sbdh a0 3dydv-hf* 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 lengtf(sy8yj+2a m+ fq41-hpmu sjv h L. What are the wavelengths of the three lowest tones 4 j+qsvmsm1py-jah+y ff ( 2u8produced 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 200c3i)(hgpge;q idfc *zli 9f.: Hz. Which of the following frequeg)feic; l*hi:pqg cd 9.(z3if ncies will 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 fundamental frequenc3*.q5dlmnema.nhe.k bul; /o y. Which statemen k.eu*mn3ne /h;m .5 qd.oballt 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 source. Ehbrcp+/ p+ owjd 2(s7wach speaker produces a tone with a freque /pw+chod72bprsj+ w( ncy 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, thejnje) fv-;;i)l qeg;l 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 par.)rcp8cdbr 1 sticular beat frequency is heard. What happens to the beat frequency if the frequency of one of the ton)cr p1 b.d8rsces 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 explah7ci fdg(rl; -ins

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approacheg0pvd )w-c9 -r6u v bey1vyet(9mjh21s0ssa ts a stationary observer. The frequency heard by the observer i pm9bre t v1 hsuw-1ct j)(0es-d6g9v0y2asyvs

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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 observeri5f4 ihg4 w0x)0tpjcz. The frequency heard by the obsex4j p40thigi)f 0 5zwcrver 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 MAC7xj:s*fqgyr/8,f og gH-speed, its half-angle will decrease by a factor,jyx: f87gs ggrq o*/f 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 352su3z8uud +l(z4 m6mcxf4z2 1web n f1a m/s. What is the air tempera8f en3 z4wlu z46dca2+1s (fzb uxmm1uture?

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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 sn 4wij gze;a84wp3 4co9wp vvx3a+q o1ound 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/ ncdnr ) j6h /,okkx8po4t3r6ws, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away watnohk,onrwj3x8 4d /rc)pk66s 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 4.0 ,jdja rp3ji1/0 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)3.;hgjm 1*0l: cbcifl)ocjinp msw1, the distance to the light*bmcc)lc mg.:wf0ip h;oi1s) 1jj 3lnning 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 temperat00 e)edy+r, gni(bqp4s t;v pqwp7j k8ure 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 2.5 s ld)tde9e;8 rs: k, uxg ivxv,(dater. How deep is the k:d8i)us(,veex;gx r,vd td 9well? (Ignore air resistance, and assume 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 fre7i+;lx5t 1 oyuajmo2 hquency 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 o d: 0)7uytzcr0x qky)ty)g8iat $23 \; ^{\circ}C$ 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 wit3 jh4vikd)2 g lw:ejn6 h/-whah 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-dB soun e/ i:ha7ipxx+a1afo*woia6-cy (ud7 d?

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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 in(; o fl(-wiuogu ok 9h-fr64yutensity levels of 70 dB and 4u(4 o- f9-glwrk( h6 ouuyf;oi0 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 ,bk 3s1j ( ck))pzaebrby 15 engines in a garage is 100 dB. What is the intensity kkrz b)) 3paes(jcb,1level generated 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 radiating equall f3e,jey,8fos luvl 90y in all directou8j 3ve0ef, ,sfyl l9ions 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 is radiatin6 unnlfqjn .8;g equally in a8nn; q6fnl u.jll directions 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 polst33myt 7cec/ 15f khwer, which is assumed to be uniformly distributed in all directions. What is the intenfcm/s37lc e k th153tysity 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 if q(f. wrq2 gkq wd(pjcm0+4/iqz7*a from a barking dog. What would be the intensity level if two identical dogqj /q*0p4r(.(qmci+ q7k wawz2d fig fs 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 leveoic4- b jfww656 p(p ki9x1jezl is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equally in all diz1-kfi p46 pboj 9j(w5xie6c wrections.

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The sound intensity lev ,qcn);x sgru;/pahsbxw;v5 p*b7sw4el 5.0 m from a point source is 95 dB. At what distance wils bbap/*;upx7ws;g;q5r c h,v )nws x4l 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 frequency of 1200 Hv7jszc0 z 5 j (.x569ghxrdhpbz. What is the frequenjghz.d z( 57jcx96sh 5 xvp0rbcy 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 harmonic of an open /qm b) m3f(nx 0j,:bqg9v kr3uc rwv+fq-hp.cpipe is 900 Hz. What is the length of the picm, 9n :fkjr b gm )qucq(f0vvb/hwr-.33p+ xqpe?

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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 ujg am. a03(mi/ykm l5the frequency of thmimkgma3 ula.(/ 0y 5je lowest tone that will resonate in an 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. gv5z5bn /.mahovh+ +vIf the velocity of sound in air is 340 m/v /n+azhv bh5vg +5o.ms, 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 iso,1 tm) y4kpwp in a 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+x/hxj/s ;3dgz axp-zbkx q*- in a pipe closed at one end is 330 Hz. What is the frequency of th/z-xqx;3 k zxbjxga+*-hps d/e 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( k sql2,yy+dm.o+mvs pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity ofyo(lm q sdm,++k2vy.s 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 where the tempem yxrx+s2-i(*ekx-19svi i ypxp5gp5rature 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 whe;8a 9obk pwmokm)8ro/pa6us , re 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 wig t4wrf) im7-hen the speed of sound in air is 34 t w-rg)f7mi4i0 m/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 open and thu)surg424 mlw e other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fund4sg)4 rml uw2uamental 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 ex-,lapdvbc3m, rrfu 3ipbu ) ck4q. 9(mit 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 ,ai rcb) 3lpcu fmd,r94ux3b-vp .k(qan 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 anor3tv:+e5m.o45xrd 7pb m0pv txo kj/d 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, which of the following is a possible the distance from the person to the other speaker? (The sound sovve+j rttx/rk0xo4.3b5p57m:o pdmpeed 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 vuzjddb(xm m06 ,67 wo440 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 tune0+,mwnf i g /tyb1o(go the frequency of a musical instrument. If (wo/y fb g,+intmg1o0 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 theq+3fob z k+w t81+jjcl sounds produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity of sound is + +jl 38f qkzcob1+tjw340 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 stri kr,g8p w-1jibhqbm.: ngs on two violins in an orchestra are found to produce a beat frequency of hk:,- birjbw1.mg8q p 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-Hz e1kd3s0oo2; 8ine5m;ts gsizk pdp4/sound source at twice the speed of sound. The observer hears a freque 3 1esek2;d8/0g nktd5i sioszop4m; pncy 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 frew smaoeh f5k.f83xz* 2(xq9pdquency of 1000 Hz) approaches a stationary observer at one-half the speed of(p.xmqz 9 osfw ke3fdah2x5 *8 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 frequencwobmyt;:z)brp0hagy 5;ww,, y of 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard z,,50 ;ybw ;ygwamrbp:wo)htby 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. It is traveli01fgz;okv e03ro0f4seri:ldtm w ex m0z0 z25ng 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 5 rs4ext1zk e fl:v03m0zdoiore00zgm;f02w 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 pu:hc2d-s fn4 a train approaches with a speed of 30 m/s. The frfus -ch2:d pn4equency 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 you atxr ktnj2yr mv+9k dmjii--/41 120 km/h. The train blows its 400-Hz whistle. Take the speed of soundnikxyrmv42i j9r-dt+/ jm1- k to be 340 m/s. 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 train blows its: yg,k dl/ax(v./ts 9qk w9fhn 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do youftdsh/ (ka gkq nvw.xyl9,/9: 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 2o)d/:v3uongygsx 6m from 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 ) um yv g/xs:ogn3od62you 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 w*m 3jo ul obq04c23awwhistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual wb3m 4j*w2ul0coo qa3frequency 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 sound i /fs2gwpcl77 kn air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the tr/k gf7pcl7s2wain 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 hor k) /jjxio6lc8n 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 approaching the train w)86 ik/c xojljith 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 sigfvs* +f0dt x(2s7on vnedzn76 nal is sent out, and a 4x+o0f6zv 7desn *n 2s(ntf7vd 2-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 produce.sowwxofs f :8menqzs1lvd7+ ( q)v .4d 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-)c jlvo9iczb1yu 8 17vangle of the conical shock wave fob7v c 1y)uv1jz89oclirmed?

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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 St:ozlin 45m;xw ates to Europe with a Mach number of 1.05 where the air temperature oz5ixn:wm;l 4 is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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