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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 isip e 2u+mjkkn04 /kjqjr r3:u/ 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 1b*+o5i u mmvp gnrw5,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 in a steel r jutbhy88.3ix1i2 +ygpjnt b +od?

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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 fx+ r brt: xd(1+kzd 5w8fgqx4air increases, what happens to the velocity of sound? (Assume thagf d dbx (5x+ r+4wfrkzx:18tqt 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 velocity of a 400 Hz sound, the vj-tqi-d/u/pwmxf5h .elocity of a 200 Hz sound through air isj -qm/tu h.fpw 5d/ix-

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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 wavelength of a 200 Hz soundpoyq 27pq w94g in yppoqw9q42 g 7air 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 fr k6lhkyr1av4 u57el4dc na m3/equencies 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 withyjv22 /jawqvc ,w v 05ocibn3( frequency 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 uniformly in alqvf7g2ed cfx *b kb/80w3t;x ren tg3(l directions. If you move to a poibkvx ;dg /3fq* 2rwg7 x30tce8en(fbtnt 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 pk//)v1 rov yc wqng8k.roportional 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 dd 3hk9m /uiy3j from the source is I. What is the intensity at a dista33m hyku9/idj nce 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 eqm,k: 7i a7+cyb7mcat kually in all directions. What happens to the intensity of the s t+cmcb7ka7 y,ki:7am ound? 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 sourc qbhnwa 1c 7cpbaff 591*06qpje that is radiating equally in all directions. What happens to the intensity level of the sound? It drwhja*f697 qc1 bbqf p10pcan5ops 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 2twydakviw9-s9nlq3trn 0 47,2uubc wj7 kx-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 4c(ozz je8y; lpure tone. What characteristic of the sound iycj4l zo(;8z encreases?

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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 not,etlnk-knu9 +,xxg w-qey.h2e?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the "pi6p+bc akmr+-ms49l7 l h0 gttutch" 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 into watey74 i.v;ozd z ub6n7wfr

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacemey)/u 2a*wdbooif 8dt0nt 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 guitag:fs7 qsy+ r8yr string and the sound wave generated by the guitar as a result of this vibration. What do these two waves have in commonsg+yqyrf 8s:7 ?

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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 botk e +no-zzf)(uh 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 the3aszlr;flvn( jb+ -f5 wavelengths of the three lowest tones produced zs(5llnv+ -;fa 3fbjr 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 Hze psox)4 rx m*pb).kr5. Which one of the following frequencies will not resonas)*rpkx) 5p . obem4rxte 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 fundamenl7g,e n9:n mvc5bcvr6tal frequency. Which statement is rvg5ncl, me9cbn: v67 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 cf;vmvxk4bu- s 1vopiff +w;l7xp3 ) :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. Wha syql lol*6(fluy(5igh7q8 2a t are the wavelengths of the three lowest tones produced 2olyi(ll 8ly *q(5 sg7uhq6afby 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 200 Hz. Which 4ycsl t1,igh 7of the following frequencies will not47y ,l1sticgh 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 i h5bzxv9 2c3mdd;/ cqrs resonating at its fundamental frequency. Which statement is correct? zxrdm2d v9bqhc;/ c35

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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 byhm+cq)f/u2e a the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when c hq2e +mf/u)athe 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 shoulds b()wagv/h l :/f)eh5p0vrps 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 txcwj+3chvw 7 c21az rhhhd *00ogether and a particular beat frequency is heard. What happens to the beat frequency ihha +zc02*vx7dc w3chj1wh r0f 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 expl+cp xu8y3aef + t-zfw*ains

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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 obse6uqyyqi /44 murver. The frequency heard by the observer myiuyq 464/uqis

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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 fr89jz5xzg h em6om a stationary observer. The frequency heard by the observereh mz8g5j6z 9x 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 itsh0,wj; u8 ju;hav(ek ww.z5ss MACH-speed, its half-angle will decrease by a fact wuw s0sa5hj.e;(jwu,h kvz8 ;or 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. Whay5ju1wykl/(lnl* 5 wit is55( kiwu/y 1lyljlwn* 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 ofrmjrh6 ixjco p8r0py2wh9))ff ql:; *ex(p7f 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*dsma20z fov. :c1zyo in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far awaya.*ov: myzz 2d0 c1sof 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, andpm:z gxy4c 9/;squvmdf/ s.dxg5u 8i. hear the 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 a flash of lightning, the d fmr arb* , e831qhfz0vg,iamowmz ++)istance to the lightning strikeqab,mz+virg 3*0meafm z8 )1wo,+fh r 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 day the temperature is: xok5okoev0 c*46blv $15 \; ^{\circ}C$. 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 deep8v2 52fdbv :et pj7avp well and hear the splash 2.5 s later. How deep is the well? (Ifpv :b5t j8v22pde 7avgnore 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 500 Hz is/ guro kk; i;72s+r fyavm+av.

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound traveling in aixz( bni(*z15qpl gq ix-dw +.kr 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 lex7df3:5i5d- setsyi z4b g kszn-, wz*vel of a sound 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-dsi 95sgi hg 3.tf69wzaB 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 intensity levels o./ m:nmunj,kh f 70 dB n,uk : nm/m.jhand 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 wpu dc67swtl * v0t3+kdB. What is the intensity level generatedsc* tv7pdwl+t0k 6w u3 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 sourcjr rb:as727za e that is radiating equally in all dira:2b 7 7rzrasjections 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 i1fe4 m fstg/t:s radiating equally in a: ftes4/tg1fm ll 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, which is assumed to be (j mu;9jnfgn(s ;jz w9k(j le emn75-guniformly distributed in all directions. What is the intensity level at a distance 5.00 m from the ( w(z 9n jknfm nem 7(g9ulg5s-je;;jjdog?

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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. What wo *l4xnwp8c 4 8h7mu.z 7y:ybfat5 eoeruld be the intensity level if two identical do o:yuemx8.thc e * 487nya4zb75lwprfgs 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 source the intend yir5-9 d-x rjocxg*8bt4 8)fz)ot kgsity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assum4x8)t cy d tb*5g9grd o) zo8i-j-xkfre 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 point sourceq;4b6z ivudqdzy vu:-y6 d u5-zp5 1lx is 95 dB. At what distance will vpxi6uq:y uy1 b4z5q d;u-zv5d6zld- 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 a8vveka ug7vz9v14x8 of 1200 Hz. What is the frequency ofe vvu88agz47v1 9xvka 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 d-.ksk 7yk6e4fdy z9mHz. What is the length of the pipe? smk6d-ez 9yfdkyk 7.4

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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 lengti14v0wbj pk1 rrb j0q6h L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open i 10kj04b6jb1pwvrq rpipe 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 h23e.r;iw5i zsfc;g.g7qdq a of 0.80 m. If the velocity of sound in air is 340 m/s, what is the fr zqd5a;7frge.iqsw; h2 ci.3gequency 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 is whf1r v59 lfctgv r-;25 n9ayrw,;zk p$20 \; ^{\circ}C$. 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 ou q fioejsnga1.*4, ;;evzk:pipe closed at one end is 330 Hz. What is the frequency of the tk: ng,14.f eoa j*vsie;u q;ozhird 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 on/ su m eck3y 3-h5mc9qtz8f/zytuy8.be end that will have a fundamental frequency of 60 Hz on a day when the velocity of s3t /m89 zcyq ku8c3 ht byym/.5u-zefsound 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 temp zsa,vhhh5 9z)xv:-ngerature 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 whx6rb s +kkisl3*z9t) 8luj6fpere 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 id qra,vz*.(m sc91xxo s played when the speed of sound in air is 340 m/s. What is the d. xzxma 9vs,oqc(*1r 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 t0)4i22gx:vydium : -6juwdlnaq bb1vhe other is closed on one end. If the fundamental frequency of the o)1b 6mvu 0d:ndi22vi- ylqaj4uwbg:x pen 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 freqr k:pe pgya1yid4)ujx 9-xu 0/uency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 19-xd jup /p e14i0yux)r agyk: 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 si g7 my:a 5cb9j*2whzlzy6nkp. de 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 followb 5n6:w7c yka.h92yz * mlgzjping 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 444 Hz. What is the beat frequey usohutq 08)fy6ve-,6dt*a3yf nu u 7 0amp6nncy?

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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 a musical jv j:d3 boqo)g3e dk7i4n7kp;instrument. If the tuner heapd :4bko3;jv7 digk )37qenojrs 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 6va phr6m ww9.ba k4 9n5*lj4fn m and 7 m respectively. What beat frequency is heard when the horns are sounded .lf m69kwwh4pnrna*9j v54a bon 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 vioh, s;iy*hm,ximi*p4a,rc tsz 5;ov( alins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentagei* y,raomt4,p hiv;*i(mahs;x c, 5zs 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 1a p c*l9g7)fekpb px2ve tq3 dt7zn45)000-Hz sound source at twice the speed of sound. Thet 4vcx92*fz5g)n3e7b) 7ptalq pkedp 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 ob+g s-9(hmc;2p(r wiyytf p; rnserver at one-;ryr(- i; y wmptsgh+cf(9p2n 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 listener moves with a speed o x f;4lqd +a.ojriw*5w. qd)kokka4r*f 30 m/s away from the source, what is the frequency heard by the o.l;q4 qkr x oodjd*w.a4w*+k 5k iaf)rbserver? (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 the cq:uvgt(cp,j )4vfs ty j0d*4agt+:bva8 vu: speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadside. What ca gf0v:u8v4sj*:at gd,( p+v) u4:qv ytjtccbhange 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 t fmf7 x9q1i8a(i,npnw(;b l ha stationary observer when a train approaches with a speed of 30 m h,q;wp nmn(9l1 ba7i8 fftix(/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 you at 120 km/h. The train blo),ltc b/fqj 9dws its 400-Hz whistle. Take j)d tc,/9bfql the speed 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. ovixo)a m+-1zThe train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequenio v xm)zo-+a1cy 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 awa+bwh 3;jh/ssg y from you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sh;sj +hw3/bg 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. It blowsc7jx( g 5n ,xmp9gzbi3;;xexi its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual freqx3; ,79 n(xgxic5mxj bgez ;ipuency 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 spqgz-zsno x.6 c9/b)kjeed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is-./z nbo9j zgkcq)6 xs 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 so d1px5oxxh i-6gu6b3xund in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the traing66o3u b1 xxhip-xd5x 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 determb,(gvs q ;nd(iine the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the obj sgd(inv(b q,;ect 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 produces:fy4ncq: e22l :zbuxblyrou- fvs 7sv)v, 87d 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 ha f4 3ruamo7w a+vynrzdz8f13:lf-angle of the conical shock wave 7y+w3o38avf drf4znu1r:z ma 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 dy cn la6w2 l9t26-dtqdh1cq*with a Mach number of 1.c-2 9q1dlctal6ddht 26yq w *n05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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