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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 iy:e5 :khk jbrh8q;dj8 r s9g3es 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 fa t)nem64fxvgl3w: vbxj/lyx6 .7il l(stest 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 soundxoqydtg 3;ec(w4 (0bl 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, wcw1oa02nf rl;hat happens to the velocity of sound? (Arc fno0wl;21assume that 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 lf1 kyl8-in1(yokc46 t uiqw6sound, the velocity of a 200 Hz sound through aicytk6konil8 6iq- f1wu (41lyr 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 of a 400p ;wx/yk 1m5vo,rcrosia cx+m4h 9z/;iu8 fa3 Hz sound, the wavelength of a 200 Hz sound in air m4a9 ir voy1 i5k8;rxwuo+hmc/x;/c3,z asfp 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 frequencies greater than 20vcex6qep7jrs8k :w9d c f5ax38 s.bw7,000 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 frequenrz/ t-a j7aqu;cy 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 all d.efc 7 /aju4pt(ufen)irections. If you move to a point twice as far away from the source, t7 e4ajct.( fp)/fuenuhe 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 wabr . ta7c4hsq3n ndj9/ves, 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 source at a distance d from the vf+cf/ 0b1rcz source is I. What is the intensitc/fr 10+vc zfby 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 fromv4h ;*iv2g5 ciynn f2+1fg ugs a sound source that is radiating equally in all directions. What happens to the intensity of the s;1uvn 2fgi5hv + 2*cg4isnyfgound? 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 sok+0o4-s c g6vtcn1w;.dzv cfource that is radiating equally in all directions. What happens to the intensity level of the sound? It t zso1 vg0c;-cf+wond.64vc kdrops 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 incre2,ihs8 gcbm;jases 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. What characteritw8h -dptty:rjw;v )z9 (rm. xstic of the so t ;)djtwrmv:r ypw9tx-hz8. (und increases?

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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 note?9uze6rbg*yp/o57t s mli w24h

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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 bt9ka g2z6ec0note?

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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 i6j/.lsv;6v vhzsye:qnto 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 waveg6r:do5ag kq5sy2d d3s 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 generaz 2se ;9rbwhn:ted by the guitar as a result of this vibrationh2n rw; sb:ez9. 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 v 27hu0alvn3ufw :( tk-idt5c 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 lengthrn+gy/ cc hn0xgwxvm:x :3gq.+ * wo;f L. What are the wavelengths of the three lowest t nqxfw: o*n.0c +g+rcy3 vg;/xhmwg: xones 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 Hyhbz5y 9.htn+tu3v 9) 8ikhuyz. Which one of the following frequencies will not resonate in the+)i5t .yt99yhuv hkzn8y bhu3 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 itt1 )f;ytq0kqrvtuc*g)v 8z:w s fundamental frequency. Which statement is corref*r:k)v8gtqvt ctqw u01 z ;)yct?

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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 *6++n.jhjmyb k*xvv d open at 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 wavelengths of the thr:t,-kd o( .kdqpq8bk5 enbk,;yvqd; t ee lowest tones produced by t q,o.8 k ;pbe(kqnd;v-dyq:k,dbt5tkhis 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.0atn. 1x7hcxxxp,yb ; Which of the following .nxbt ;x71x cxa0 y,hpfrequencies 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 ru l.lf mvso3 r,.( tcej1hs)atqkj67:esonating at its fundamental frequency. Whq m efst3)j.:t1,vh7csl6ulj(kor. aich 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 spea(hn no-xpp v5pk5c kq2 y6bjafk,/1k/ kers driven by the same source. Each speaker produces a tone with a frequency of 200,khx nkppfpj (y/2-5bnkv kaoc 1/6 5q 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 sgigrvpesm/)yyw tbt ;; m 730,ovz-r ;ound 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 together andbepwv0tl7x b1ax ;6 1d a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones pe;0vt6dbal7bx1x 1w 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 explains,3 gstofac03 yl:6k sm

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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 stationa:c66v6 squ2qeub* (s tsac)pe ry observer. The frequency heard by the observer isbvaqs*6:2ucqc p 6eteu s)(6 s

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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 st2zvez:aek l20ationary observer. The frequency heard by the observer i2e:laz z e0vk2s

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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 wileiugi*qx *. uj*vx rc9i. -ma7l decrease by a factoriie.mr79ug iac- ux v j**.x*q 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 frequ6 xg nn0i*qp;fency 45 kHz in air is 352 m/s. What is the aii q0np;6xg n*fr 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 sob,) v ex9i1ijz 5irncrh x734hiyoc t2,if;r, und 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 o0so x,da0owwv+te+- uf 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 objw +dxwot v,0ae+-0su oect 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 echoop rwj3fw ,t(lfd5i5 h(u;i7m 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 af5 )hc+wi:0wub+nmpin ter seeing a flash of lightning, the distance to the lightningbiwp cniwm05+ +: nuh) 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 on a da6+8/6 ptpfrt0lq rpf vy 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 splash 2.5 s cb,,fkum.os: later. How deep is the well? (Ignore air resistancesk ,,mbu:c f.o, 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 as5f6hsi *et ,2a+ptqaj 0rz:a 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 aip5p/ l nw(pus-u 8v,byr 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/ jjbauru/4uzt/kn* 5 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-dB k (xy .zqn2y7r,tv 2jukrqf u209qo(xsound?

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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 wityxo8bcdxyxeq5p1l qo-33k6 (e*0dh eh intensity levels of 70 dB yekpxqo 3*d e y0d(xe68c1bql 35xo-h and 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 intensity 4irjy yrf7 k: o;4 par*8lyrq1leve ryk4o ypqri8:1yr4jr;7*lafl 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 sourceu.l:t. *idxtkf jm3ly1 h+lc1 that is radiating equally in all di11ujlitt .lx+lcfkh y: *m3 .drections 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 m- .pwrvcz.7 jis radiating equally in all direccwz.mj .p- 7vrtions 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 aohx64qxu3l 3j bout 1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m fr463hxou lj qx3om 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 bark o1m gk2.swn 9*:) 4mnolrcmnting dog. What would be the intensity level if two identical dogs very close to each other are barkingsw).c rommok*nt l mn:g2149n?

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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: q9m9m4z:av,eyk ux6iod nw7 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 source radiates equally in all diqeu7vn:4a6w:9kmdmx z , oy9irections.

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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 u l-ehnz2hq c./;rw1c a point source is 95 dB. At what distance will;ehr cn u-1zw/ cqlh2. 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 co:qp58u m ympn ;(gubh(mplex tone has a frequency of 1200 Hz. What is the frequency of the fourth hm;n qmbph(y5 p8 :uu(garmonic?

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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 op :vn0+r(ljf p cbjd+(een pipe is 900 Hz. What is the length of the pipn0jrbdv+ (c( :ej+lpf e?

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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 *by o63 +h6 *onaikhn)nyogd)length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe on*3hkoboo) ny6h a*nd6g)+i yf 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 ep :r;.f1c9:cnw dr xkm. If the velocity of sound in air is 340 m/s, what is the frequfnd e k.c;wc:9 rp:1xrency 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 temperatu-vy34:u uiry kre 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 c 5o8;idf b6 bfgde-ej):em +bvlosed at one end is 330 Hz. What is the frb 6obj- i d f+8fbgv:dem;)ee5equency of the third 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 wikfuc(h3/1 -n z6rjkoull have a fundamental frequency of 60 Hz on a day6cr1(ozuk hfn 3u/j -k 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 temperature iwtyc2b o )fy;:+a)rvas $20 \; ^{\circ}C$. 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 whed-8ghjtxr9as7 a 4g4q re 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 oz,bae5))mq t qf length 0.75 m is played when the speed of sound in air is 340 m/s. What qa m),bz)5qt eis 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 length: one is opt xad*sbf,dxo z15 ic,ub 2.szx,4f6nen and the other is closed on one end. If the fundamental fre2zixfxa41,d5osb,zft. c *xd6 s n,ubquency 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 t5 gy*,iw4ey cof 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in fryt ,w5y*i e4cgont 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 driven by the sam/y) qfyo st04he 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 distan)osy 40/thy fqce 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./d 8u 6kgjhbfjk me1+ 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 a yv d,6auj7x) s6fl5 dmmusical instrument. If the tuner hears aa v6u)f6 x7 symj,5ldd 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 respec4rjq n5c ,nt6mtively. What beat frequency is heard when the horns are sounded on a day when the velocity of sound is 340 mt,64cjq 5rnnm/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 p6fwjs q-pj, vw7 vg85 /kw6vixroduce a beat frequency of 27 vwqp, j 8j6w-iw/vvg6skfx5 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 1000-Hz sound sourc6atrv1eb2w+s/p 0qg js ;cnu/e at twice the speed of sound. The obs1wg+2/n jbcq 0vp/;reu s6sa terver 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 observer at6 n+yito6ybn 8qom 8n .kkuq79 one-half the speed of sound. The observer hears a frequenc . 6b k moo+t7u986qikynnyn8qy 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 2i tfiad vm86ibrr7 qi*7.n ooii;k)/f 30 m/s away from the source, what is the frequencyitf; 76a2d). *knri8oi7i v/ qiibm ro 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 travelinw3q9 / .*bfk v5npbmulg at 35 m/s on a day when the speed of sound through air is 340 m/lk9u* mbq5/3b nwfp.vs. The car approaches and passes an observer who is 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 stationary observ 9p 0x a1gyt;iohxi)7qer when a train approaches with a speed of 30 m/s. The frequency;q1gt0y axx )9iop7hi 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. ysh q*hy8w 4daq6syw7sl r6vc w.ut(3ty.( y3The train blows its 400-Hz whistle. Take the speedyh r.tq y4 yd sws *cat8yv7ul(366(w hsy.qw3 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 stationar 4ovp4u1shhm0t) ak1snhr4sid99b p 5y train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What spt4i rm s 4dhp05 ou1hh1 nkva)b499sfrequency 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. The train blows its(9 f:gdy r9v-dvfby9 a 400-Hz whistle. Take the speed of sound to df9rd 99bg-:yvvy(af 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 km6a/dxy x8qw4+sezr* b0t8yw d/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actua8x*+zwt64 xwaqdey8r 0byd/sl 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 the speed of sound in air is 3452zu 2 b79+ein g7vcv ndi8dsu0 m/s. Whavds7uzvi+ni u5d2n gbce89 27t is the frequency 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*ydl7slt fvmj w7. y 1rej-80t horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is appro.j0ye*8j 7ml sy 7v1tlfdrt -waching 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 kt :)/4p bgafoof 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 object mgo/ :4ptf )bakoving?

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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 produ:6o2pbwbt )ri,hhla3 n*a :o nced 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 ffcvd9+92kjeneo4 c /b80mak1.4. What is the half-angle of the conical shock wave ford09b4 mk+o8kce 9f cjvna/2 femed?

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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 Unit5xsq d bb 8k*uu-z,y3qed States to Europe with a Mach number of 1.05 where the air temperature is5yu3*b bsxuqq ,8k-z d $5.0 \; ^{\circ}C$. What is the speed of the plane?

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