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习题练习：Physics Unit12: Sound
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 70 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；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。本试卷的直接作答链接 https://51fly.win/test70.html
 作者: physics  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 stati.al ddlb 9 o di)(wk.z2+3co ,rymry8e2 +lcgement?

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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 throu-qnk/me fxc lc8(e0rzm s8o uirvmsm 92 /221egh

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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 r s* ij6k j7kt0fp.7whyod?

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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, kd*.ha2isra 4what happens to the velocity of sound? (Assume that all other factors remain consraas4ih2 d*k.tant.)

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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 soundm-5 zybhl8g+ox*( /5xwjs88s cbvikg, the velocity of a 200 Hz sound through airzlhg*v5+ soxx- m w/bks58y8bj8(ic g 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 wavelengtfw1n)m 2uj5 n;t3 ud2zyapj *yh of a 200 Hz sound in air tyy5 d2ujjufn;2pna3m1 z*w) 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: xg i,p pje,,gywk+t/ 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 cavwb/qf)s3 )lt-;w -vcr olou)lled

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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 i8oqj ugqjs+jvrz *kjd .70/wf 7;u4qys emitting waves uniformly in all directions. If you move to a pkq u; sf0j gq .y*u7djz4/r7 vqo8jwj+oint 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 waves,t )zlszwg-6,wuk r .b, 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 from the source is I. Wha:qax0i+ bako* p8qffqp (ih9 9t is the intensity at a dista0:k fx9a qa8ofih*p9qqp+ (bince 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 soun ry.xj.(e:6a:r; f yzsvzv3lxd source that is radiating equally in all directions. What happens to the intensity of the sound? a.l3yv :zzy fr;x:e(rj.s 6xv 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 dista; km+ofiakqum)3 09 qlnce from a sound source that is radiating equally in all di9 u3lomqm i0)fk;q+a krections. 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 le*, ddz8io4p increases 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-0rbas .k9 k.yvv *dkk. What characteristic of the savdk k*.bv-sr 0.y9 kkound 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 note+g* vh3.tkxiz9:i xz l?

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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 musi wmw bi7albb w).fdt2b42p .d7cal 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 fr kf g5/:q0 ovutwl.:wxom 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 displacemeno,e, n12/m+ps oqcyhqt 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 on a guitar string and the sound wave generated bet8g8hbwa 9/ g: w6vbky the guitar as a result of thwa8gk8vb /ebgh :69wt is 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 which is openmzdl *kq8 y:,;fviz8 n 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 wavelengtlj p-ys ,+nrqn 49:u (cfhpg75v 7kizths of the three lowest tones produc 7 h:jn5rknfigzuc lq-p+(7y,49 vtpsed 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 /7 m qq6*ne f- )dirbeevt)g*vlength L is 200 Hz. Which one of the following frequenci fv/qbe*e-r)qgen*d6 mi 7)vtes 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 frequ*.vk+ 0xml2d w/tn7.wv fb srhn1u+n xency. Which statement is corre +nkn/rd0*v +vwxn.7xfut1b l2w .hsmct?

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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 /o,kh:b w,hel 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 of2j yu. /5ecqtux1 innd4 v0b13;mratx the three lowest tones producdnu1t jtu xrq 20 3x1;e4m/cav5.bniyed 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 2 m-v3wchj55 m cq1r/yq00 Hz. Which of the following frequencies will not resonate in that pipe?mr5q mq1cv c/hwy35j -

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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 frequencs 9 i y:8lp+0g98 u4l f2btjdzhvpcc.zy. Which statemen4dupp vzy g 9 bj2: hz8cis8tl.9c0lf+t 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 5 cpscviy/8b0 same source. Each speaker produ0 pvi5y8/cscbces a tone with a 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 two sound waves shoulk5 hw1cpd kg*4l.mxg8d 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 sounk 7 xw b+31( hb99hl9cuovqqylded together and a particular beat frequency is heard. What happens to the beat fhq9(uhl 7 k l 1cvx3b+yb9owq9requency if the frequency 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-8 zkosk-5fqk 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 approaches a stationary observer. The frequv v5-y/u s/uruency heard by the obserrvsuv5u /uy/- ver 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 *0 (v6m s:b0cxxhbhamstationary observer. The frequency heard by the observ*b 60 vsa0hbmm (hx:cxer 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 decreas 9mikiavkv- 00e by a factor o9-i iav0v0k kmf:

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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 eanmk xc7hnyo) qdir:;qn20;f 7s/1 t. What is the air temperatui0 nn /2qmtd ;)q cnf 77r;ys1:hkexaore?

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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 spep+rro;,d6w sz ed 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 is 340 m/s, auf-1u je13r7(vu7pva4iz ih a bat emits a shriek whose echo reaches it 0.0250 s later. How far awa4z7(ap-vje u7a rvu1h3 uii1fy 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 7b3;*odsa)xaf txk9w 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 tos ihn.ahr89d; the lightnih8rh i9.adns ;ng 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 tw66+ bkbaz/k 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 ud54wz i;y,z6w 7g17dnnizxj a deep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sound izd6dy,i7jn;4751 winw xuzg z s 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 w-n tkv,k-r u p5xe6jk3fg6;at7 yrf q(ave 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 airrk8. lf+rvb- 0yhrpa : 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 1lhwk.9qw u *xxi6u*usound 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 a 70-dB soundbp 2o4e 9pmz/xlcj g8pri) :)q?

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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 o/ ns9w39amtx*rzys fz2(ppk0 f 70 dB and 4*9/09 3z2pktznsx smpra (y fw0 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 gaw+pzy + l8v*aeru (3israge is 100 dB. What is the intensity levelr su vieayz3+*p+wl8 ( 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 ra+*,b v n ,gzgzlzc9tezr0+0 iediating equally in all bzi0 *, gn e,+gvlzz0rc+e9tzdirections 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 radiati8ep (i rxt7b; v1m,ofhng equally in alm7 v(frhx io; tpe81b,l 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 power, whikcs6kbvxwr7fp 4*.zl87jq uv+(y 4vdch is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m f u7f( yr7v c l 4q*.4vkwxv8pbs6+jkzdrom 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 distancekqq 8.d7,i vruvsy/ 4l 5.00 m from a barking dog. What would be the intensity level if tu 8v7vkl. dq/r,i4y qswo 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 sourimf :z,wok a3k mh:).mtx93ty ce the intensity level 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 directionsm:f.iw 9y x3) zttakhm,o3k m:.

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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 9p s0y7d+c c;ik5 dB. At what distance wc0ip +;7kscydill 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 Hz. What is the f1y *. lw6)qitf7me x4v ua7g cu5uflw4requency u 7 f6wqtxflvaeu1g) w.* 744iul5cmyof 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 pipe is 900 Hz. What .h,sudj-or tte9pk5 8yqk n./ is the lengt9 /jyq.tsurk8pd e 5-,ko.hnth 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 reso0;opo, 4mk tgknate in an open pipe of length L is 400 Hz. What is the frequency ofo,t gkk4 m0o;p the 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 bowizx:l bwx/voo (c* -+th ends has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frx oi: vwl* (+xwcob/-zequency 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- dja (wea+pi, 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 aezqbm5cd,cy: og f -c3.s4i2e*khg u9t one end is 330 Hz. What is the frequency o s:2g e9f -emuc5 gyc*hkq,cb od.iz43f 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 that .(vav/vm mppt)o4 sm 4will have a fundamental frequency of 60 Hz on a day when the veloc4mp. a4mmtv(o) /vspvity 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 rod 9 3+fbg;5 sxo;q zuomrccv1;om where 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 wherql+d7z+i5+:laxiu2ph ej s. ne 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 when* /jvm,yctg)w the speed of sound in air is 340 m/s. What is /yvmtw,*)cjg 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 tx1,ecvstqkijk,) 4 * vhe other is closed on one end. If the fundamental frequency of the opets xv,qij4*kk,cv e1) n 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 emits0 pks); y2- xib+i5qqh eb1ix a frequency of 800 Hz in air where the velocity of sound is 340 mq25p+i-e)yx sqbhi1k xb;i0s/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 driv-hoa4- n8lv sben 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 h- s4a-v 8nblois 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 mlab*aev a*a p.:3e pgdgr;am,+xz 9,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 forb 6rzv ll)mx+n5:pkor; -loy/k to tune the frequency of a musical instrument. If the tuner hears a beat frno zyv/:6r+- p)5blo;mrxkl l equency 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 ap0h 1k73 fifxd7gw/u .l*m z1u dy0yizre 6 m and 7 m respectively. What beat frequency is heard when the horns are soun uhzz*y171i 00mi d7wdpgykfxul/f.3ded 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 kwqv9/bm3e7( + tx*v+ ujw ctwtwo violins in an orchestra are found to pro+w +*(m xcvu3t ewvb/w7kj9qt duce 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 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 soxg8xzg0va e3p:zt1h 0urce at twice the speed of sound. The observer hears80hx31ap zv xg:0gz te 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 observer apli*; k8r dkk:t one-half the speed of sound. The observ8kr:il; kk*p der 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 speed of 30 hjpf4 xx(5jq o+j.9v gm/s away from the source, what is the frequen5.xvo xgqpf (4jj+j9h cy heard 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 siren. It is traveling at 35 m/s on a day w5g 9 i65jvv/ob ryrar4hen the speed of sob5iorgr56 j 49y/ravvund 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 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 oyp.s xz/do/re4b 0 m8fbserver when a train approaches with a speed of 30 m/s. z/sr08bemx4yd/ .fo pThe 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 youv7;pdz;n8t hbvi/of+ 63 uxul at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hu;3tz +v8ufn7; b/d lx6i hpvoear?

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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+- q gj 53tn;clvlmou0 train. The train blows its 400-Hz whistle. Take the speed ; 3q+ lunvol0- jm5ctgof sound 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 km/h. The train blows its 400-Hz x1q.8iw1 k npgbmkf45c .bkg;whistle. Take the speed of sound to bnmc 8k g wkb54i.qp;1.xf1kgbe 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.r3pxo,utyyxd 29z; 0 l It blows its whistle, and you hear a tone of 400 Hx ud,2oyzx;ly0r9 3ptz. Take the speed of sound 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 sound in air l6)m bq/ckoxze c- 9r16;*0aily awxg is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the trbk/ q6 aig 0e6l-1 ; ocxyrcl*mwax)z9ain 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 hornp hx jdbq;:3a.n38ses 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 with a speed of3 xesbjdqs.:ah p3n8; 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 deter, p5(-z 1jomgng+pgooya 9p) emine the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound i zj1g9o)gpp-e+,oamn 5gy po(s 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 supersontn * b xd5us: ,qjqu6tc/b)2mrk93st wic 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* y;,0ezg8c zmdeg f+vhg4t3k(o mii. half-angle of the conical shock wavgt8 0eem,m vyog k(; ch z.*+zfg4i3die 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 Unidp+o9y;7 r hgvted States to Europe with a Mach number of 1.05 where the air teh;g7v r+oy9pd mperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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