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习题练习：Physics Unit12: Sound
本习题练习来源于题库网 (https://tiku.one)，是在线习题练习的打印版，您也可以访问本平台网站(https://tiku.one/)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://tiku.one/test70.html
 作者: admin  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 k y4v ,4ur4cosx 9;kwiis a false 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 fastest thqd zlq0 h1-zd(rough

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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 w2 c:vgxt3 mi+sound 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 of the air incrr1exw3e :cnuan,v 5b3k) y/5x op3a vqeases, what happens to the velocity of sound? (Assume that all other factors remai3k ,yc n urne) avq:b5x/vep3w1a3ox5n 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 *uaoxa/h 3 9oe;f/ nxj6xkp*7eqip0nof a 200 Hz sound through apei3of* upjxxanna o6/qh7*/; e k 0x9ir 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 p; kxlvvnmx u5:uet4re 7 4m44of a 400 Hz sound, the wavelength of a 200 Hz sound ik4: 5pux4 e7 4ml4nvvx; ruetmn air 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;n6;wldprydcn2c l8b9f48zz )e ir2v frequencies 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 freque 3qa7uv gte*6fncy 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 unifo)) )p/ 1sctj43 mu kyg7nm,ti- yoonbarmly in all directions. If you move u)-4tp) jn i1c mykmboga/ont73s ),y to a point 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, intensity is proportionam)2amcftyqp n8(+nu* sz-9gll 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 p.b ;yod) lz0ha sraj65v 2ss-f:bqw)point source at a distance d from the source is I. What is the intensity at 56b)sw;r0j: .)ovqzf2 dlsyaa-sbph 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 f y6cwolw qavs .j,ak* m+c.(0lrom a sound source that is radiating equally in all directicw.. j(v,*o0+kcmlsa6laqw y ons. 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 sound source that is radiating equally in alv(z13r3 8dln w mntdd(l directions. What happens to the intensity level of the so dv(3rnltz 3wdd8m( n1und? 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 7k;) w.gmqj k kjqk6.b0z2rghincreases 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 pure2m ,a.n/lbynx tone. What characteristic of the sound increase.blma 2yn ,nx/s?

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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 musicalmie+9 znb1 zx*zcf55 b 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 w ex,n1,wjq ))rkegbmb 8x,s6note?

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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 wu3) zsd 8 ehcetx7i3*uater

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacebo;fg,v f d1yu0c;sa5ment 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 guitarb62 :wese) sib,b qh4l string and the sound wave generated by the guitar as a result of this vibr) b qb b24is:lh,e6eswation. 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 open at both en 4xmuca8nq 8f+ds, 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 ake*+3pfc 9mdwavelengths of the three lowest tones produced by this pmpf+c9 k *ead3ipe?

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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.g90jy,upv; a*x,bj vdid: q(j Which one of: ayxi90g( dujvj ,b q*,dvpj; 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 0ia v-4rxs;xl m:a0fefundamental frequency. Which statement -il0xr ev40: ;asaxfm is 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 o j3dh08oh tf7)d zx*blne 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 wavelengths1uhfi4v:8j nm3 n7bje8ywed 8 of the three lowest tones pron1 md :8y4en8efi8jbh7 w3juv duced 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 cle :kw 3. *drr++ qaop4d5ded;1lzjw qyosed pipe of length L is 200 Hz. Which of the following frequencies will not resonate in that pipqed+eyo* dd35.;j l+ a1r k:pwrqdzw4 e?

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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 enxzdw6ye p- wi;54:nynd is resonating at its fundamental frequency. Which yi5nxed w :6;4zp wny-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 the samxuq7)nwpo a9/y, j:korz .:rqe source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/soq,y9 :k r u/nwzj.axpor :)7q. 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 tw mdab*vm5-. cto 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 togx9z wdiz3a bbm9tsls,z,7 0c m)rei04 ether and a particular beat frequency is heard. Whbzw9m,sltbmiic3e0,0r d z47a 9sz)xat happens to the beat frequency 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 explainjt(jco 1nfj(k fwg0dvl7 fcm8 5f087es

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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. Ts/ esaw :7lesg3brwab 3ag;d69rl4 6qhe frequency heard by the obse s;wa:sg 6sda7q 9lb6wl 3arg/r3e4eb rver 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 obseraa;y02 xobsj0vq -sc6ver. The frequency heard by the observer is v;002ssoajab-c q6xy

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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 1k 28pgek9s8-u qqcajdecrease by a factor c-kpuq1ak2s j9g8 e8 qof:

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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 iqmc0v z*.4qr wtho.k 9s 352 m/s. What is the air temperatu*qwmz. 9 cr 4vh0kqo.tre?

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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 ih* ge8aompw)3 n 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 )t5gpiio,w6 oq u1bv8w60 iurof 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 o uo)ir8igo65vp iwbqut0 ,w16bject 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 eg1sr9qc8)z dk 1ia lw+,8vsnpcho 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 after seei s91hj j5pksew)1r. z*mxevk 1ng a flash of lightning, the distance to the j1rvhs5j kme1p kwz* 9e)x. 1slightning 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 ak +:g(p hqzc5k0qmd8 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 dqi;, m(+ geyq;tq rgq;eep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resisq+(g,iemq;yr tqq; ;gtance, 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 500,s a*pla;1mujt fe9n + 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 at9/ obtx/3wzkoypcs(b)oi;y d0. t eq-4quvm ( $23 \; ^{\circ}C$ 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 intensity40z6 t tthbr/q $10^{-3} \; W/m^{2}$?

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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 soundc3nmoi(gry5 / ni/ cyeobr:-pu s.j2acqt1,1?

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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)gqe (uk9a )wi1ba 1bc sounds with intensity levels of 70 dB an1u ai9q1cb (abgwk)e )d 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. ;s8 awlvhh +i1 gg55sv What is the intensity level generated by one engine? 5vwgl+5a g8v ish1sh;

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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 distanceol+ re;nfk le/ebi9pcw8(lgr2n1y;1 of 6.0 m from a source that is radiating equally in all dirokpn8 (y1; l9gerf l;e2ib l enw+cr1/ections 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 snppr/5n:liz-yu 83h asz6a+qqz 7kz- ource that is radiating equally in al+ r7 3/knnzp u-h 8paz6:zasl5qzi-qyl 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 deliveze-8 0b 2g;bwmp3 vnftrs about 1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level ng2pf3mz b;t0 evwb8-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 from a barking dog.7-hmxn7+tl kn What would be the intensity level if two identical dogs very close to each othek lmnnt7+7xh- r 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 level is 60 dB. Whae.-bd/m y8iolt5u,f,.c nazy8sql3 it is the intensity level (in dB) at a point 2.0 m from tuoleci.mq-n d.88l /ys3z5y , ai bt,fhe 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 le7dvcvc ep g1/bw:-d/ kvel 5.0 m from a point source is 95 dB. At what distance will it be 7ev :g//17pvdc dwcb-k 5 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 c6wqr2iqbtcc, 7jq;g8u) v lv +omplex tone has a frequency of 1200 Hz. What is the frequencyuc )b8c ,2;vglqqvq7tjw+6ri 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 pipe is 9fa)o* kpa1 )hv00 Hz. What is the length of t1 fkvpa*)ho)a he 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 is 400 Hz.q9 5b4qnx bhr;dq q8p) What is the fq q9d4b)p 5 qhq8nrxb;requency of 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 both ends has a length of 0.8vtq es25otdto 7*)d z-pm1f,s 0 m. If the velocity of sound in air is tteom)1os*p7f2 d-qv dzst, 5340 m/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 t2 (p mi)mjehm*emperature 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 enr;sl9t(/v57 in5le z:zuwyz yd is 330 Hz. What is the frequency of the th 5 rwly(/z7ve9s;izy5 z:uln tird 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 wk8pascwu0 u7lf2.d/fk5h ucdv 4l: 7f ill have a fundamental frequency of 60 Hz on a day when the veloc ku/wcd l h7u70d2p 4u.5:vlf8 cffaskity 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 ro1dp p+x: ( fdmm2hr(ehom 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 where the t wzr4wp ir(j29emperature 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 the speed of somfk6dzpch8 x7*mwl: 2 und in air is 340 m/s. What is the fundamental frequency6wd*z 8 fmlk2 :xmh7pc?

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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: onv*-tv v 25rxiqe is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the *qix2 v-5rt vvfundamental 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 the velozl5,otarl.- gq0h6kq city of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in front of theog6rqha0lz,-5l.tq k 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 frequencmf ovkk)n*7 d /gdnv0)y 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? (/)7k f*vd gnvo0k) dmnThe 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 frequencibir01q(9ac 9vxcn svev6j84bes 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-H5tt- uw+x4 0zg h1sefjz tuning fork to tune the frequency of a musical instrument. Ife+ h - ttsujw45xgfz01 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 the sounds produced by two horns are 6 ml hs1;u:k a7re and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity of sound i1:klrhus a7 ;es 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 orchllt(b wnu2e.f (oh,u8estra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hzlnbu8u.2,e (ot(h fl w 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 stationaryb//a cp6 vfa(m7 q msaic3s/9r 1000-Hz sound source at twice the speed of sounsiam/bp3cc/m7a9a6rq /fs ( v d. 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) app 58 jnvg3rvd b/(m5ymlroaches a stationary observer at one-half the speed of sound. The observer hears a frequencyd(jgyv5rbm /nvm8 53l 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 4zlly:nnrip.a); .el1 w4ld cwith a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speedc ln.4ay ze4wl:pnll;i .d)r1 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 qb/kbw2q yxk6( if30o 8x3t blsiren. 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 frequency0w8bk bbl2t3qq/6k3x ifxo ( y 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 station2z;a 4 uhxjof3ary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 3 uj zho24;fxa600 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 towg*wcxnf)++3j u1eu *hl j)ed gard you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of souu *j3gx ld jw+c+1e)u*f)hgnend 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.hs0 ;/l2i9 z)vyagod q The train blows its 400-Hz whistle. Take the speed of /qods2l) yai9z hg;v0 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 you6 x.3 izmeort 3qfq;7w at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 7 owqzi e6r.m3t3fq;x340 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 whisn2.poh:dfmhbzu09+ * rnpv.otle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is trf0pn.+9h* no :dpomu2z hb.vhe 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. Assuq ybuj8(p;9k e/dt/s*40 ) p8eq*qetqsvx gtgme 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 with a speed of 30.0 m/ee pks;g/e u tv 8x(8/tb)ts0 p** djqqy4gqq9s?

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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 air is 3y0zav ;+e y9nj40 m/s. What is the frequency heard by an observer if the observer is approaching;y 0+evazj n9y 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 object. A 40-kHz signal is sentx3i) 5vv1 )vshyhi ei- out, and a 42-kHz sx 1es iiv3-)5v hy)ihvignal 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 supe)f /yha2mj ug9,7v ojrrsonic 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 Mz4qic1igo3bpzt+( wp,8hnlu j lr /p;-6 xa2vach 1.4. What is the half-angle of the conical shock waverpz 3nvhz16;iuwgl 4qix p( ,c+jb p-to2l8/ a 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 wit1dwcvov gf6ts0 kl, l2,ht7, mh a Mach number of 1.05 where the air fwgl s tt6 v1k2mh,o7v ,,0ldctemperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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