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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://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://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 falpbc w. 7ha-pqx; i(2gmse 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 qa)3iot l5xw -aci.fzkdnt3 -7bdd. .conducted 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 sound5vc5oe7e d1k f 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 ob: k y2lm.ncp3f the air increases, what happens to the velocity of sound? (Assume that all other fpm:c2kyl3 nb.actors 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, thk3tlg07 6+tdpat s;tdl 39afd e velocity of a 200 Hz sound through air s0gddklf+3;9at 73d lat6tptis

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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 i4 ;9+pxzmh1jlv d8vk a 400 Hz sound, the wavelength of a 200 Hz sound in air zjk9h ml4i8dv v+;px1 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 frequencie2o efwiki .80yy-au ib4urks9 )(pokmu8(y j.s greater than 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 i05ml9q:48/ sx ull3ec xtz(c mx+wxd20 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 uniforfnv 22+;hq pkemly in all directions. If you move to a point twice as far away from the source, the frequency of the sound en ;2+fhvqpk2 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 wavpd7 h+ 39n,pus ob(mgees, 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 sourceva7.pr6 px h1rs8hic3 at a distance d from the source is I. What is the inten17prxh c8.a3 i6vrphssity 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 radiating equ rskeffi: s 1s/436qnh1e/vsd5o x8 6pmj*ubcally in all directions. What happens to the intensity*o6sunfbc :vs jdm 3is15r/qph6x4/s fe1 ek8 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 equally in alt . d g; 9/frte7bchc(2i0y xj5oqiwm6l directions. What happens to thefyh ctcregmq ;6j2 /0tox75wb(9.iid 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 sounsjt3 6j ,z7woxd 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 4nu64zfjjjrxb. ; d m,a pure tone. What characteristic of the sound incrdj.z xj6j4nufm4 ;b,r eases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudnessr9z mm l0hor;3zux6w3z vb+l( " 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 c,k4 7uxrh(jua 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 from air int1k:i 1oj, 7gsjmzcl 1go water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacemeni:p*w3 kl;om4pd s8qe/6sbo ht 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 by jaav*.ph n a/ x:ddgj28;;yjz the guitar as a result of thispaga* yjna:jd ;.x 8jv/;2zhd 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 1x h),n tgzun)plu0e i1foz9(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 areyftz8 az1 p68rfkj63o the wavelengths of the three lowest tyf8r fkoz3 t8 61pzja6ones produced 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 Hz. Which one ofo4j o3vy;)sa b the folly);a4 svj 3oboowing 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 tqg:0v.vg1i ;t/ii7y ws u4gu() xufhresonating at its fundamental frequency. Which statement isv ()gg/f0u. x4tu 7wgyvt;1ui hqis:i 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 and5i ok2ikv / safoa,1l,a9.cos 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 lzql96yhzs9 x d+9ma,d ength L. What are the wavelengths of the three lowesq6a9x9+,s zhlz dy9dmt tones produced by this pipe?

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本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，获取更多资料
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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 rece6l3 hnr0 8c.sfunu+ sonate in a closed pipe of length L is 200 Hz. Which of the following frequencies will not resonate in that pcf r8c n.nuue3h0+sl6 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 funda:7/pfl9bi6h rr2to famental frequency. Which stfrhf patr l 6io:7b29/atement 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. Each speg;xf brr 80*b9hs:anj aker produsfaxbr8b*n ;h0:9j rgces 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 wave44py c.8 pw;obbpfz0p s 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 frez3- kth)1/u t;-cngphz 3viksquency is heard. What happens to the beat frequency if g kh- t1z-;3 n/c)ht3zspki uvthe 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 explaillj vsr4f (lj6ed: g/.-4n yakns

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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 frequency heard by th-n/5 , wdyjowxn*4f. bo8tqwme observer is 4ob dqo5/n mfwxy8n,t-.*wjw

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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 frequency heame -rxa -v of-:q3axo0rd by the observv-e -x- ma03oafr:xq oer 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: zbvlkk/ )1cg2 kygz oc.bx3 kajm+7,e by a fac)z/g: gcvx7o1a+ l, cmkjz32kbkkby .tor 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 352 m/s. What (z u7kwsg9/yr o4f b*biss/r f( b bzkyo97*guw4 the 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 sound in air atk1jkb ut 0..p2d4v rkn $0 \; ^{\circ}C$ 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 spelpdqe6xlm5( 1j aduhg s x0b87k1:ok;ed of sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How fa h da 6ps8(d5k1: 7jkqgx;lb m01xeulor 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 the echx4g4)rb2 rw:.vmj: 8 +s tgod:e fxpifo 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 afu75qjh; 682m*ck y// v/asjw r 0tz)lahgvjan ter seeing a flash of lightning, the distance to the lightning st;ahgh a0vjzu/ nw ltjjaq 5k)2y*r/78cm6s/ vrike 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 daymuoy s :(u*1dg 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 int:n; 2o)bdallds6 , lsho a deep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and as bhl,l:sna o62dsld ;)sume 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 wav -0,mryk wf5nq lo6c3xe 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 air at :ba7i 5hup-yjxg6 y5v$23 \; ^{\circ}C$ 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 witha,+tqfkdsg*m* 9n n +m ;zfolwl,+w q9 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 4 + cuicotiu3(a 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 p2 zyn;(h-f/1 ud zwtpintensities of two sounds with intensity levels of 70 dB an1z wpu- (fh;/dzpnt2yd 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 intens) vlh9;)dcjoaf2 a /xoity level generated by one engine?; loo a)a2)9dc/xvjh f

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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 y +yqb0gslqn +9(8edkuibza(b cd)6/ 6.0 m from a source that is radiating equally in all 0bsc+e(q/)zaydd l96gb+yb8knqi u( 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 of 6.0 m fr0( m)l*nruo hkwuiv6t9k69 dkom a source that is radiating equally in all dir 6 h9 *)ntukkmu9wiv0r kl6(doections 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, which is assumed to be unif- 86eyzfhfd:7 z,a jwoormly distributed in all directions. What is the intensity level at a distance 5.00 m from the dog? : z8y7oj6w,-adf hfez

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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 sq1/hi;+1tfl w:nw vz5.00 m from a barking dog. What would be the intensity level if two identical dogsh+zf1t/w: v nqi1wl; s 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 mwgq g4roa)wugi:s(fqr .kob1 4n5 x9- from a sound source the intensity level is 60 dB. What is the intensity level (in dB) at5qi4qa-():owxwk rfg4ugg r9sno b .1 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 h4*yvpvb af.ao0 ;h943 hphkbpoint source is 95 dB. At what distance py90vf .a*bb4h ;a3hkpo hv4hwill 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 Htka h;pp0;lwq:8d:/n 5 uxvydz. What is the frequency of l;5xd; th8a p:/u:d0nvyp wq kthe 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. W5jad:,ey0ox km79 ;xsn qz.p zhat is the length q yzjo9 xkxa,0;nz57:e mps.dof 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 resonate in an open pipe 6bnj:oqh 1) ngof length L is 400 Hz. What is the frequency of the lowest tone qn o1j)bg6 hn: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 4pffq7 i6 0biaof 0.80 m. If the velocity of sound in air is 340 mf7 fp 40i6qbai/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 a room where the temperature iswey8cj5 qxg ,bxr0q 84 $20 \; ^{\circ}C$. 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 frequen avxs*fdr) gzv-,j20m4 ujz( ljt6rn3cy in a pipe closed at one end is 330 Hz. What is the frequency of the third h msgz- *6jr0dfz 2 4,u jnrxlv()3jatvarmonic?

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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 k (v7(.ax3vmj2hpd oh *lb(qq the shortest pipe closed on one end that will have a fundamental q2 h.j((3xd(q*p h kovbva7ml 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 where the tem)0wbkmc 8xd ,g 46uffsperature 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 temdrlbf/r .j /,k-a:r coperature 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 whe0 ftgobn6km+2ht -0jpn the speed of sound in air is 340 m/s. What is the funda-j 6 2t +mknfb00thogpmental 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: .rqgx* gsrw8k7 *id (done is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency og7 w8k*xq(r.dds* rig f 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 thi, w 6eapq8et)9-cuj2+x8 *yxq8kmi u- u scnte velocity of sound is 340 m/s. How muec a 28jtuc +9 xtukeuiqq*npixy-6mws ,-8 )8ch 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 mg fi:6c+vrv2 driven by the same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the 2+cf: ri vgv6mperson detects little or 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 frequencies of 440 Hz and 44bd)lkmj)*,vc:gv:kn7 u :e sl4 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 tune the frequency of 2uet9*mkxh5w a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the fr* ke5h9xtw2u mequency 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 s9zur y)zj; w 2zipw4o9ounds produced by two horns are 6 m and 7 m respectively. What beat frequen 4ozpyi;zw )92zw 9ujrcy 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 found t4f5 u rq+myh*mo produce a beat frequency of yr*mh q5f4mu +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 100bbi khxun r4 . c4/a5vy90ehc20-Hz sound source at twice the speed of sound. The observer hearsv4beakyur9xhc 2 c4.ih0n/ b 5 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 Hzwltv8vug vy,zv:6 c1/) approaches a stationary observer at one-half the speed of sound. The observer hears a frvv,v 6 lygv8cutw1z:/ equency 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 1s, +b jeo5deoe m)3bu(000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is thm5) e3,jdeuosb e( o+be frequency 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 when thegbf j80 t *c;w,crjq+k speed of sound through air is 340 m/s. The car approaches and passes an observer who r ;8,q*+cbjg0tjwkf cis 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 +ycdq 60/omrm stationary observer when a train approaches with a speed of 30 m/s. The frequencyymcm+o0 r 6/qd 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 towz 3:6;l v 6gi(bz) gfwqkw8h(n )hdaozard you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What fre zzn;b8hhiv6wq g )d w63((flzao :k)gquency 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 tra i8gd/ uugypa7bai 5:rex.-8 din blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do yo. gi daeau/:-8 ig5b8 y7dpxuru 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 eu xiz5q*sbb(k2;49t1 kjwh umzz7q /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 you 7umkbxejku24qt qzz*/s1 ;wi5z(9 bh 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, and you ec/c5hp;tfm( sp4f:u: z grw-tk)a g)hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequencaz5t: tgfmpugrwseh/4ck)cf (:) ;- py 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 /ju.iml : f+i8ywvuq57 rv9pfof sound in air is 340 m/s. What is the f.u v/5mfqirj9 8 +ipl:vuw7yfrequency heard by an observer if the observer 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 train horn is 500 Hz. Assume the speed of soyvz3o+g2 p6f fund in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a s6zp2yf o g+f3vpeed 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 signal is sent 6ldsb rheu(5 )out, and a d5 rh)e(lsbu 642-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 prodoseui)jd 7pxc * 178tluced 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-angle of theiv.s53m g -39rbvk dnk conical shock wav3 3-gvks.mkb5vidn9 r e 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 States to Europe with a Mach n5v l781ly3 7gpqzv qhmp.tr5f umber of 1.05 wh tl 5v78mpz7.hlqvrq3yf15pg ere the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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