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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 falsax9 woate:n.h,x*3davld/ ,ne 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 conducted fastestvn.xdrx; v ;v( 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 l1qv9 i./h+ vi)jcculyb+,ftin 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 air increases, what2fa n-c6;c8j tbn*mlx happens to the velocity of sound? (Anlnaj 8;cmxt6 -fb2*c ssume 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 velocitazzg*,6sc ; k jipj+3iy of a 400 Hz sound, the velocity of a 200 Hz sound througzzj 3 ij,pig*a6;ksc+h 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 wavecvd ph,)e394n zbjm8plength of a 400 Hz sound, the wavelength of a 200 Hz sound in acz84ph3n ped)9bjm ,vir 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 2+s*p typh:fn y(a)i z20,000 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 thai3c.w0c bs tw)n 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 w(pngm4 )9pb ouniformly in all directions. If you move to a point twice as far away from t9 w(pbmnp)og4he 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, intep)usc 9ok komr 8955jansity 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 poin8p;3 vtn7agj8dbsg)k r8 b1z ut source at a distance d from the source is I. What is the intensitys)tgdnv 8gj pazbr38 b7 1u8k; 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 distao2. f65 2;chhqpi +phwkmw ;egnce from a sound source that is radiating equally in all directions. What happens to the cw2 +fmk;w qh.opph 6e;2ihg5 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 radiating equallx. 7 3fisgu2t e/xbrpz5) dpj0y in all directions. What haptx7 js2/d5.3ippe g bxz0)f rupens 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 i;,zyyf4fy; fh18k+ (eh1yaplyb +d gincreases 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 tonlhwgia x 2zh5)ng bo-aa.22;ne. What characteristic of the sou2in g.gxo-z22a h hala;5b w)nnd 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 mux r:m 7*1 zl l49c5hh10iugovac9) gb0kxcpezsical 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 y8ec:ac6f , woo0:qz s8+ndid a 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 frohdleo).m1l m 5m 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 displacemi8noqf,yp* .x ent 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 qt8rm 3;p71o 5p c)ljy4xh gpjby the guitar as a result of this vibration. What do these two w ht8 opprcl5j );1gj4qyp x7m3aves 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 end o(c8+o0odquevj 1 sz+.pf;oxvdvh +. s, 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 )y k vzf8q2lgp.a2 .yrthe wavelengths of the three lowest tones produced by tyfqk.2 l zyvrg)8.2 pahis pipe?

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 le or;2ark8wg)qrik jir1f+g 21q40podngth L is 200 Hz. Which one of the following frequencies will282ro;10o4 id)rkq+ prfagwikgj r 1q 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 resonatkhdo/9i dvkp,; ;) z1 svdpio,ing at its fundamental frequency. Which statement isdd p 9kkvp1s;,ii)do h o;z/v, correct?

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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 the otheruko:+f0 bvxf/1q -aj u, 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 wavelw)i/uib0imz7 /(i lvvengths of the three lowestim0w7lz( v)//ivuiib tones produced 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 resonate2ktb6v3mpr;;l +t wnh in a closed pipe of length L is 200 Hz. Which of the following frequencies will not resonate in that phv3t2 klrmwb + nt6p;;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 resonating at its fundamental ob.ez5b nwu1-,24lohvl3 nwl frequency. Which statem-b,e.2o5h w43zul1 nlolb vwnent 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 bypkda3 e8 gcgz.8,yg0k the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sou,z03gpck de8 agyg.8knd 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 shozxzxq,+5 g0* 1 gkr z--hc+ nusygtz0luld 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 bea2tla q8 .yy:ccef)qb)* f7: birg dzc9t frequency is heard. What happens to the beat frequency if the frequency of one of )):bl cy7ie 2zqdra9c fg8b. yq *f:ctthe 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 expl * zbh(wh*66uizoep g(v-sg*pains

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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 observ2 d:6os9vcffs er. The frequency heard by the obser9 dsfv fc:2s6over 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 observ1c q mf+2f/lwoveix;*er. The frequency heard by the obseim*wqof xl cf12/;e+vrver 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 hfw9aqf ;x;pmr- kb) kg. w5;vralf-angle will decrease by a fac9.gr;w f-wxrvk)kq;a5;m p fbtor 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 l9ae8xc9 r zk(gw.4 jzof frequency 45 kHz in air is 352 m/s. What is the air temperature?a gz 9x.(k j8zlwe49cr

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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 theb.gzjfp9xp0 ,trpq zt;2(ot0 speed 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, a bat emits a shriek wh; cpx ncc07ir2ose echo reaches it 0.0250 s later. How far ancrpxcc 72;0i way 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 spcjbhx4yehg) l,)xu - 3t8)za . 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 aft7 :uzf)b b1ej5un0ko mp0zw1ker seeing a flash of lightning, the distance to the lightnin :10nfmoe71uw)uz 0j5 bk bzpkg 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 uluc 0-xi:+r xs 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 splash 2.5 s later. How deep sjfd437t ji/ yecn,h7is th f4stji7dcyj/3h ne, 7e well? (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 frequency 5peh;i9ni ou,lvdle 6:n 3( sa.00 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 atb8y / htzxcpf7o pp4frm/9 oli:007 ok $23 \; ^{\circ}C$ 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 intensi fpwuk( * arnq47kwrq2-.jk,a3 qg6 kkty $10^{-3} \; W/m^{2}$?

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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 o2v 2) d1g gqxta/q1uxa 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 inta8:dg )saf,ixensity levels of 70 dB and 40 dB? fa:x8sdiga),

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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 (:m/uj.c relsw-.xmg intensity level g .uc -:js.mwrlg xe/m(enerated 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 equally n* giv;sy(elepaur z3ql202; in alez0 3;*uqys palr vn2( ;egi2ll directions 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 3u*xxlco 5rl0ok9faz0 v /mb db44 r0rn.w0 lkof 6.0 m from a source that is radiating equally in all directions c0 *3zl0v l/k0bxlnmroub0. 9ar45w 4x orkd fis
$6.0 \times 10^{-10} \; W/m^{2}$. 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, whi7avv fy(fw u;/ch is assumed to be uniformly distributed in all directions. Wh/f ; wuyv(fva7at is 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 a dista:7i,gkjf g/a1dxi8r)xg0e/ll e zv n9nce 5.00 m from a barking dog. What would be the intensity level if two identical dogs vxea7l /g :v n/jk0l9 fgr,)g1iixedz8ery 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 frow y5 9d/uyiotj6 4aek,m a sound source 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 directio94ai,6 t/yew ukoyjd5ns.

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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 vm.a20 uemc1xdistance will .mcv 0x 2mea1uit 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.a.19mdg0ce my+41rxg5u8 kiu hkwz .p What is the frequency of the fourth harmonip4ck u egzaw81 0m+.gui9mx y51.kdhrc?

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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.gq3,5hcqd5ea What is the length of thd53 cg heq,a5qe 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 i3q()gvqm q1+qdf0 l )cytkci4s 400 Hz. What is the frequency of ttkc)fcq1(3v4g lmyq )i0 qqd +he 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. If the va/ hf5 ;ecgp-delocity of sound in air is 340 m/s, wpc-dhaf /e g;5hat 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 a room where the temperatureer 33 sqbl;m(xh7vy1 g 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. What 9:mw)b6vs/itik 5kkf is the frikkbw6:smf)v i t9/5 kequency 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 oneuttbbydi-ng8 r4d)5 3.9/t )uuinqjv end that will have a fundamental ft3d).n)udi4/9btu jq vy- u8gn itb r5requency 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 wherekag6s3wsnf d,s to. +*h f+fu2 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 temperature isg0fo z*mi/b1f $20 \; ^{\circ}C$. 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 leng)ve8h rve rfi:s-w4y(wsi m59 th 0.75 m is played when the speed of sound in air is 340 m/s. What is the fundamental e)4(i ww :mies5yf8s hr9vrv- 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 sammyaq 7vmvvi 0e6q p6):e length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is6mi v)e:v ym6qvqap70 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 of 800 Hz in air where thexyd 5zpav4d+9 velocity of sound is 340 m/s. How much farther back would source 1 h vd5xdy+a4 p9zave 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 same frequen--l9rio17 es5 mdalb 6i-m elx:8.f4xtm nhdocy 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 o5tlm b7.1-r4 o9d mxmod hil-as8:- el6efinxf 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 and5vk- k* kff*d(w7g pqd 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 tuqn d14n9 nmi7bning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, w 91qi dm47nnbnhat 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 b5rj ,i+e7 w 5ikh;dh:w s6v* gsmtrwe)y two horns are 6 m and 7 m respectively. What beat frequency is heard when ti vwe,k)j*wrsi:wd e6t;rh 7g s+55hmhe 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 violinjf*5t qp5 b1 j4s1/akkin uu5u strings on two violins in an orchestra are found 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 th 5s4tp511*bkk5fj uaun j/iq ue 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 stationaryt7wo9 uv38gs pxqm8:ltedb: 9 1000-Hz sound source at twice the speed of sound.q 9teg:vtoxls8 b:837 wd9 mup 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 obs +tusek7o( i4ierver at on io+(keit 7us4e-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 frequency of 1000 Hz. If a l53 *oulbr,osnmoo+lut/ a tc6kbs6 54istener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 340 m/s.6/mb k6cu +o nl ooab3 ussl*tr45,ot5)

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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 800b)nu3h9b7w hh-hrt1 g -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 along the roadside. What change of frequency does the observer hea3 whnhgu9h )b1- htr7br?

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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 m z-(blu+vbfb)y ukg/+ki-)f a train approaches with a speed of 3k)m - )bl+fg bfivu/k+by- (uz0 m/s. The 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 yov/z-ww ou-z6vhi t5ge4 k (q,wu at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to ,oh vk6wzw-gv4e -z/i5 uqt( wbe 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 tr cztsno 5b7q+t*x 8qb,ain. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequzc,*t qsxo7qnt5b b+8ency 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 zfj) aojoxgb2mt l;s; area; 4frva;j-h4/51from you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequenaj4 g2xrf; he/at1j5rlfm b) s j;o;av4oza-; cy 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 travelinggi)fsdq :0 eh, jo+w9s away from you at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency of the whistled ofeq)0jhigw,+s s9:?

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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. Assuf +cm 30qk;b+ zbkem:jme the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train+m:03b zqb+kme f;kcj 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. x4 0nro 6/0yj7 pg)dsr5t;qr-hmm spw Assume the speed of sound in air is 340 m/s. What is the freqrodp0j s gp04/wx )57q;rrmhtm-6synuency 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 obje kbl8.p5 fmg,wv:3qt t1/uujfct. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fa1 mk8w g3 :vt,.lfj5qtf/bupu st 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 +x my 9i.dsc6fd/c1c(tju*fm produced 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-anglex/gud,(2 igi9 m5q dyw of the conical shock wave formq ixdg,i /5md(ugw92yed?

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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 Mach nfb5ezunvt-9 )vo6xo 9umber of 1.05 where the air temperaturo9fv5 ne6xt9)vzbou -e is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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