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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 is a falsey4g6. lvehux. lll:k: y y;s5b 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 f3y /e b4axe0feastest 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 sd:i rw/izq )0jeib1w1teel 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 q,z-quy iuy3q;epj3gnbft0aub , i t2 92a/0 lthe velocity of sound? (Assume that all other factors remain con2t3u 9j,fq20ib q nayu y;gli 3-u0zpa/,eqtbstant.)

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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, thdvk--c+b2qp /pajpx8nwm o .bj9b( r 9e velocity of a 200 Hz sound throu p9-j9qd-rbanb2 o+jw8pxk (cv m.bp/gh 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 wavelenfw1yq mb03+q cgth of a 400 Hz sound, the wavelength of a 200 Hz sound in m1q b0+3 cyqfwair 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 ftxs-) zheu t52p9zce0 requencies 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 e 1 h(32e9ej7hkb 4g5bc vxiahthan 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 r4aqeaw7* 0iy.zy 2ogin all directions. If you move to a point twice as far away from the source, the frequency of the sound 72y wyq*z eoi.ag ar04will 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, intensil 9ggz t2u0u ung) k-8w ennn.:*i5qzbty 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 source at a distance d from the source is)mb b*qqv6j 3d I. What is the intensity at a distance 2d fro6 q)vj3mb*qdbm 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 sourzj73tsj h*cr7a)0x so ce that is radiating equally in all directions. Wos7 jrhj3)scxz* 7a0t hat 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 shc,2a9 r r)vr*ap.gdg f,pz9 in all directions. gprv9 *a,dgpf s2 r.9azrc),h What happens 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 increag8 ccf;k.exw0 ses 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 tone. )p)gngj3 v zk; What characteristic of the sound inngv;3)p)gz jkcreases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" o39 . n9vc3abjmep9txv f 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 "pitchcu0-oj -:1fuu y1q odov,h2em " 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 intx/x x9 3qbh)ngo water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wavesxx9p yc3ngl2 q 42 basft,eof- 4+qo0g 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 guid;hfur og8h yo2dt260tar string and the sound wave generated by the guitar as a f hot 8d0;r262dyuohgresult 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 w yx0qz 9paz*8thich 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 lengtx6ipgaff)n: dea4y af n*(z9,h L. What are the wavelengths of the three lowesta 4 a e6 x(:ffnai)dy*z,9fgnp tones 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 lengtitzg x* u3aq-j5o:*,ptt+apj h L is 200 Hz. Which one of the following frequencies will not resox zp+ta pi*qoa j5*:j-gt,u3t nate 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*zkf yw z8oqn(y314cx is resonating at its fundamental frequency. Which statement is correct? nzo3k*w1x(yc z8f 4qy

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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 clos;bzgp ;s9ok w2ed 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 3p (sohvrjcfa2 37ib 3of length L. What are the wavelengths of the three lowest tones produced3ipj2( ra 3bvfocs3h7 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 1fy.9 .e6soirlli7uwbc 6 sv (a closed pipe of length L is 200 Hz. Which of the following frequencies will not resonate in rb l9oui s6s7cilf.6 1wyv.(ethat 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 res xxc)k3(1lqc 5 fb r2r/5u.srzpua:yyonating at its fundamental frequency. Which stateme rcy)k zl/rb fu yq5.3xc:1u2s (5axprnt 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 dj8 7jg z7h d12p*:tsknn:dm 4cqz2q vspeaker produces a tone with a frequency of 200 Hz on a day when the speej z2gzd*v :t2h:mnq dc87j 174kpnsq dd 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 shou d6n s)ky lov;t-)ws8ald 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 frendgf6ij hgy3 1o7:yyq uk1a3:t:g2gh quency is heard. What happens to the beat frequencayghy o :uyngtk 3 :j2h71qd fgi6g1:3y 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 exp d gmq8.)f ul -9gq4qheef)+gmlains

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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 heait sli mc.85m va0vt r6zk :7rqn+6kf(rd by the observert8f(k.sm:nv0am 6r7vqtrkz + c5l6i i 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 ob;fm r 7 ,qfkh9uxgo4q*server. The frequency heard by the om r;g9xqoff *h4kuq7,bserver 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-spp+, bwoufq+ffr 9-y3s :cv;noeed, its half-angle will decrease by a facto;, q93wo unpfof srv by-f+:c+r 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 in fvto:x/b w/ /+g7ij5*bpfbis the air temperature?ibbxffj7o 5 vi+/w:n b *t//pg

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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 a0cjz9h.i*p sj0tz do *)g/xlat $0 \; ^{\circ}C$ 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,j9xqzcv3drr v6 e5kwk a -8:.x a bat emits a shriek whose echo reaches it 0.0250 s later. How far xx:v.5wqj a3zv ec dr r9-kk86away 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 echg )1 zccg64trso 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 xl. /umkit.3l distance to the lu m3.lilx./ tkightning 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 bc8ja r 5pn31 0q3ylriv).fv(a rsza 6from 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 hearzed b:udu2b75 the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sound is 340 b5uu2z:bed 7dm/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 abxz md4bp8e 7 ma9: vwk6v.)fa sound wave 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/w sm5ys7a7 ;g(djuud $23 \; ^{\circ}C$ 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 witc 2)wrvblpxj0q7 6zlw- u s75th 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-t0fqd( /krmv 1o(o;jydB 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 wit(i2tyy;t2 eex h intensity levels of 70 dB any2;x i t2e(yetd 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 ubhfc7l9 6sqpp,:vu ) r s,gepv)sx5,dB. What is the intensity level generateds )c,, qh lvp 5up,usx69s7vbfgep):r 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 did+ m7i cmd*mm-e2e/tvstance of 6.0 m from a source that is radiating equally in all direction d-v*cmeet /mim72m d+s 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 radiating equallyr;ve-h5h*x mp- prt2n in all directions ip*;--2nrx e5vmhr pt hs
$6.0 \times 10^{-10} \; W/m^{2}$. 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 adig,0hdo53r+rs s w 4cssumed to be uniformly distributed in all directions. What is the intensity level s5d3,4c+g rirdohws0 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 bar da 18.kv a pz.1(x/tyn,xeqncking dog. What would be the intensity level if two identiczxn /akaqevn1c 8x,y d1p..(tal dogs 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 intensity level is nblcbs 3 kr/ a rp-2ae0v4;j)g60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates 4-l)b ep/g0 a jr2vscbaknr 3;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 source is 95 dB. At what distance na,)le e33jj 00rhez ewi ne3 0 e0e3j,zajehlr)ll 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 comple4 s1jo q.8 iyxhu;b 8z)z)d; d,xeyypbx tone has a frequency of 1200 Hz. What is the frequency o q8,xpzsyo1 hz; 84yx)ueyj)iddb.; bf 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 anrly bw2 672t j6bxgc3a.1sas l open pipe is 900 Hz. What is the length of ty17ags2xt bja32l6sb6.rlw c 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. Whatbw8px bwqi+6jq8 t7a8 is the frequenwaxq j7+8qw 8b8p itb6cy 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 0.80 m. If the velocity okje)nw4 0;od lqf 51)gllcj))gt*d ilf sound in air is 340 m/s, );*1igto5glc)0d e klf wn j 4)qjld)lwhat 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 roomq g.p mp kd8t7 cjl1;0uff6xu/hpj h.: where 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 pv+ j1v f+5n,frlix4zzipe closed at one end is 330 Hz. What is the frequency of the third han++z,l 4vzvri j15 fxfrmonic?

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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 d-s: gvdc2k:3znk (axthe shortest pipe closed on one end that will have a fundamental frequency of 60(sg2:k czav3dx:nk-d 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 i -2eyqpa1vp;es in a room 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 temperature is a ,l+hrdsvfhi.e-lc 3a2;dr3$20 \; ^{\circ}C$. 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 bmy*vmg dv5 (p;t:k4yplayed when the speed of sound in air is 340 mgy(4v:t m;kvb5 y dm*p/s. What is the 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 l2 hin+p7u53 .4fsr bnbzlk.ni ength: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 2l 7nkr.if s+b43n h zu.pn5biHz, 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 the ve(v0fso/e -.pkj9 ybcn v3j)mc locity of sound is 340 m/. yj3)s vovp0fc-/ c(nmjbe k9s. How much 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 cns qq,2fs+ /yand driven by the same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person detectscs2/y ,fq nsq+ 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 444 Hz. What t7*n 30jv. xq j wn5pswss,o8a,f9r dzis 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 fr b;- k1*vm-9(z b/hlg:ztc3ag twhx fqsi0xf:equency of a musical instrument. If the tune0xw* -g ctq(lvbtfm i b:gsk1a/x hz3h9;:z-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 respectivel(fdov 93vsxm )6yc; amy. 6 39amxvc)f ysmv do(;What beat frequency 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 anqm (lg8nv nwta *v8(b/ orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage cgln(b/mav w 88*( vtqnhange 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 stau55v-bhu5n,ltgc , +e4x2 m6f ik nufftionary 1000-Hz sound source at twice the speed of sound. The observer hears a xlmviff, 4hgtenu n+5c k-fu5 562b,ufrequency 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(d2kc yoh g-e6j4 w3,cbtv7om a stationary observer at one-half the speed of sound. The o( h jm,k 3y7wt-2ed4cv6 boogcbserver 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 witdhqj chc4 :jbxb+6al p wdk );m6;1x+wh a speed of 30 m/s away frp)d cwal6h;k mj;j d b:w+bc46xqxh+1 om the source, what is the 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 ,lbmi* td2jwmi4)s-l;dous,v pg7* :wwc5 h nsiren. 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 dow-wubw2m;d4*jmt c7sin lvd p*,o i,5g:hl)s es 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 frequencut;o 0cnfi;mdo7sx7: y heard by a stationary observer when a train approaches with a speed of 30 m/s. Thefx; o0s:cn7id;om t u7 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 kwbe05o8r9thsd 3 zq 0train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hearo3q0 b h0s kw5zet89dr?

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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. Th 5r5+ez)ei8ctuv*.8j q phtmed 4wz g*e train blows its 400-Hz whistle. Take the speed of sound to be h5*re zidzjp+e8cg.uw84 em)vt* t 5q340 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 you at 120 km/h. Thec9jm+ck 9mrhcp .:hl4 train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you heal9mm . :4phj kcr9+cchr?

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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 awr+44/wx9cjyonlh vcy dls8 (0ay from you at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Takejv/8nc +h 4d( 9wlyx4l0y scro the speed of sound to be 340 m/s. What is the 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. Assume theu(1 r lq x;c46gu(wmskmk;+ jp speed of sound in air is 340 m/s. What is the frequency heard by an observer m +1k u64ljwu(rkgcxm(;pq s;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. :.e lq9fh.kl2kt v(nuAssume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approachi u(n.:k k2vlqte .hlf9ng 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 )e7qi;pvh) xzut, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. He ph )7);xizvqow 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 con yc dcjh zi-4kmgo+dn2: v4(t1ical shock wave 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-angle ok,eyur r3wl. 0r nm- +nm6m+oqf the conical shock wave o6+mmnw.,03yrl qukne -mrr + 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 flieor+/-ci /vl z.yr+ r79nzadaus from the United States to Europe with a Mach number of 1.05 a7u/nli-+r oa zy d.c 9rrvz+/where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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