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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://mail.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://mail.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 falsyc he3o s/bm4 +u0x8cbe 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 thnh 6hjg:9d )v yjrid./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 l c(:zq aat)l1sound 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 increases, what happens to the velocity o)7gj)do.6jqrtvvook7q njnr6qf7 5 (f sound? (Assume that all othenrq6o7o.(q5) qtvgfn677d jv ojkj )rr 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 velocity8,w k-km a;chfspssky il6v5z)00e m; of a 400 Hz sound, the velocity of a 200 Hz sound through air e;m0vwpl kacfmyz6si8;,sk -5hk)0 s 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 waveleng lpd/l: b/+r3 xg/ys1og5no dmth of a 400 Hz sound, the wavelength of a 200 Hz sound i/gpgd nb y5os1l/o/ldx3rm+ : n 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 witkw9pn* .pd- z/:xxeknh 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 frequenccb qsqj hc5u6p1mpd,hye68oih l/m,j.q:d . 5y 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 isbe+/;s i -otd 9dqdqi: qhlo.5 emitting waves uniformly in all directions. If you move to a point twice as far away from the source, the freque5i9io/q eq o d:qbdl th-+;sd.ncy 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 pr+zms-eo3k l1d;dyrb+ ddc4b(oportional 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 ad;l e9fmir:3x a/ lp8jt a distance d from the source is I. What is the /d;rm:l3 8fxapiej9l intensity 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 7/1wtpf; yfaz e(sbo) sound source that is radiating equally in all directions. What happens to the inte7 f(toz ;bwa1/py fe)snsity 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 hit)qm k s g/2rr-1;otj-pz*oequally in all directions. What happr-tr2-h ogik1sz; mtq *jpo/)ens 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 it 3uo1ovf j*uul./) srncreases 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 towardflb: p j-7qgoj7yu6 h2;j;wyg a speaker emitting a pure tone. What characteristic of the sound increase- ;fjwu7 o2;gqp 7 j6glyy:hjbs?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudn fe;phn.y/8 1k)lzlmcess" 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 "pi.;kbq 8 5ps/dryf+ vpstch" of 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 from air gwmszijb:bh6mxb6a/ 98 4 u,j:k/e hc 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 displacemewgol/6b g plh8snjj(; wq)m 6w:r7l m5nt 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 wave1v.kb+pm ze 6vwoy251sp;e ta on a guitar string and the sound wave generated by the guitar as a resulom2 +1 y1vkwzap;. 5 v6pseebtt of this 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 open at blk(qf*d -zp( -k4h xjpoth 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 wavele*buy -jhk(kr:vxywh b i9b;gq6 a86)ongths of the three lowest tohx 6 8;bwy:gk*ij-h6qo )yub k9 (rbavnes 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 pip9bfl vo4m wci ud6mfi wb3 6o-u-5in9*e of length L is 200 Hz. Which one of the following frequencies will notb *muu 5v6 dw94n fiiol -owi9c-fb6m3 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 fundam3grqe 0y5) 3-bhjoiilental frequency. Which statement is correct? -j3)rybiegh5l0 oq3i

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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 .lep/+gb ,k4*h0mtmkaozi 2g one 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 wavele kptpcz/c )ks06ad9 *xngths of the three lowest tones produced by ttk9pc spz/ )x6dc *0kahis 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 d d+;+g24ngiquafr0j) o3z,bfcps) h of length L is 200 Hz. Which of the following fre qgofi+; + d 2,gu)fcz)pjsra40d 3bhnquencies 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 fre 3lalq/7gz,,koekzk 2 7bcr(ajg1ct : quency. Which statement is co3q7ge1b l/ clj,z,za 2ak tcgk:(7k rorrect?

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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 tn*n 2buq/8knx+i dbfzv-u( f 8he same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the skifxn-udqn8uf/ (v8 b2*bz n +peed 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 should ha(- qi2)l /mkf:ah scyive

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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 frequency is heaw 9 cyyc i98f 97bcw:wc3fiq5mrd. What happens tib9wfi yfw ccc8m w95y7q c:39o 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 explai4x xgayfj f310l)l e,glwp,i(8)dflsns

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approa9xv ;qcket.2cches a stationary observer. The frequency heard by the observe.tk2 qcc ;9vxer 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 observer. The frequencync;85.b 1 :(ajqn1kdiq6k kjuz. t7hicmd 0zx heard by the oba1 (m xbudz. 1;czn0h8tc7.iqjqdk: 6i5 nkk jserver 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 tq68v3d9 re smno double its MACH-speed, its half-angle will decrease by a facq9d36r8 nmve stor 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 frequene2f/ktz8mady z/ /-om;w j1 vpcy 45 kHz in air is 352 m/s. What is the air temp kyjat1/zo /e8m-v mw/zf2;dp erature?

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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 spe)sak 9zq:,nz(k /f2(yh /rlanttgf(ked 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 340vcdl/6 ,arc4 d m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that refle,4 cd/ad lr6vccted 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 tgt:kyt +n81 )xjkwe6v he echo 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 seeing a2jhof( xjjev (9)cxx qw(+c 7qh :.dmy flash of lightning, the distance to the lightning strike is abou.dewcfm 2h 7()q(xxqhy(v j9:+jx cjo t

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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 chyt s hl1tg0o::n-4s gliff 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 spxrw 6rq +k oyh3s.8v7alash 2.5 s later. How deep is the well? (Ignorexk3.ha s8rov76r+ wq y 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 ofl:iv1m +br oo *ng5:cg 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 (p h w9rmvky()s(x(:j m4epoc7ldoi :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 sound wit3) z9f bplear: m t3u9s8,dkoqh 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 7q5v v-:q4mfm7zmvg0yi*3ss; q .zoz s0-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 intensityox0j v5l m22-dxfdm 8s levels of 70 dB and 40 dBx8mxofj5-m0s2vdd l 2?

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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 d4c 2hmmt+l 5vc.qsl ,garage is 100 dB. What is the intensity leml h2d+c4s,lv qc. m5tvel 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 equally ib u- ;s4*hbu6i.uqd / nv/pjexn all directionx.j v-e*4quiupbb/u;nsdh/ 6s 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 rad 8rsp*s 7gu0okiating equally in all directions is our8*sksgp70
$6.0 \times 10^{-10} \; W/m^{2}$. 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 k dl1gud3 )gaqm y15yv..aq o3mW of power, which is assumed to be uniformly distributed in all directions1dgqkgv3..dl31u 5)qamoy ya. What 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 m a(ozkkk*,3m is 65 dB at a distance 5.00 m from a barking dog. What would be the intensity level if two identical dogs ve ok a*m3(,zmkkry 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;ym o5c 6*ntsqvhn+2d 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 sourceoy+ 6c mndt ;*5hsqvn2 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 )xdek ,jf)5 ipfrom a point source is 95 dB. At what distance will it be 75 dB?jiek)f5) xp ,d

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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. W pcaqr bcl8- pc*g**l0hat is the frequency of the fourth harm qbppc -cll8c* **rg0aonic?

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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 is the leng4 f+a-gqrm: opth o r:a4 fpqo+-gmf 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 of length L isrhr6l v b,t50o pgp-2g 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of length 2L,r-gp6 bh5o0gp t rl2v?

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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 velo )jvmxah51s (scity of sound in air is 340 m/s, what is the av1m(sh5xs)j 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 ta8 yt 0pj5q8iwhere 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 in a pipe closed ae;vbi(b j 2y8/vyje5yt one end is 330 Hz. What is the frequency of the thi bye/i2b8yv j(je5 yv;rd 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 shybhx dz 15-090uoy finortest pipe closed on one end that will have a fundambf-0zy10ouni5 x9y hd ental 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 wht;p:p. .qt3zc(h zndh/ dd.7 juum4qkere 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 whe 2e)pnb,iqx +- kct.rwu.a 2yire 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 the speed of sour ) h+byh;5 i)kj3rtkznd in air is 340 m/s. What is th))thk+bhi3 ;z j yk5rre 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 lengthpxw 4hoy; xo+y+eh .a(h ag.qr)e,cw1: one is open and the other is closed on one end. If the fundamental f;e.4ohxwg x,wy a oh(a)e rh+.py1cq +requency of the open 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 emit a frequency of 80uj(crz0ol h/a q3n5vs,n m9 c,0 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have tou,(/lcozhj nc sq man03v9r,5 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 plagaecx6 pu; krej01,2 oced side by side and 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 spgao02cp ;j k rx,16eueeed 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 444 Hzkrknr9xwkha3ya ;)pvgj2,6 8/ ;lxij . 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 freq) jf/ ft7r(blc:v:d3s;;fw5tjk c eewuency of a musical instrument. If the tune3;wtc)k jbct5 sdf7w ljv: e :re/(f;fr 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 m and 7 m respective) d,6apmc cd- z8qg1prkq9:lsly. What beat frequency is heard when the horns are sounded on a day qdk8mcrl9d 6s,) c p-:1qza gpwhen 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 to pro *t5k4 suit25ce:vpodduce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension of ontkov p:* 5d5 seiut24ce 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 source at om*luk njq,l611l)sms fw *j6twice the speed of sound. The obse* q1kwfu)ll nsm1os jm*6,j6l rver 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 stati uofa.r5akwz r krwo6b/y)3 :6onary observer at one-half the speed of sound. k.)6k zbwr oru5a/6f 3y:rwaoThe 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 eseqfm7s1 5a 17pn x+it4 co4oa listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed 7eo4 i11f+4 s5tme c7nsopqxa 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 si0x4grae-o2vm a)a-9 x os+xirw t ho-4ren. 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 hear?0h2-sxxtom )r r 44e-v9 +ioagxowaa-

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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 g kaaw 8wv*j; pkf831:nbrc)e observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz p883kajvb 1c)wwk r;:af nge* 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 at 120 km/h. The train blows its 400-Hz whid,gd6 wvm q:t3*bkwd8x1z;vkstle. Take the kzdwb:1 v;m q* 38wdv kt6dg,xspeed of sound 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 traiq a(y(h fz06c9wf-pcb n blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency d( f c06q wzbpy-fc(h9ao 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 d-ia8+jiosqw 1.d l k,f8jbp6 blows its 400-Hz whistle.k1pa68iqd sw+jd-b8, fi .ojl Take the speed of sound to be 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. Ittwf :ydezyi3+md6 0 u* 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 3i t*f+ye dywd m0z6:uwhistle?

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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 dn9m (nu3 ln,yhorn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency l,n n9 ny3dm(uheard 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 horij2zc at+q,. ,v6-h boyviva.n is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequeo ,t,y6-.iahvi qb2v+ zja. vcncy 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 object. A 40-kHz signal is sent o iye ik-f(2dd2ut, and a 42-kHz signal is returned. Assume the spkidf(-2ey2 id eed 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 bx1s kj zr:db(7h2b p+xy 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. m-0x.,hwby (awbty +fWhat is the half-angle of the conical shock wavey bmfa+.(-t y0bxwhw, 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 froml5rt*enj qs kv 8 66yq3t,s2jz the United States to Europe with a Mach number of 1.05 where the air temperature j5nqv8zekq rsy l2t66 *,3jtsis $5.0 \; ^{\circ}C$. What is the speed of the plane?

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