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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 izwf w+3h tu2-a4ueo 8zs 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 q1)mdzo*.ws4 roc acd1vom, )fastest 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 rod bn(7kmdg7ok5(..yin;wsr ,fows 7 ew?

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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 happe r(pbdi0n 4a0f9mo-xm,9 2n bbmr8 wadns to the velocity of sound? (A o9p,0 nf bidnr84abxa d290wr( mm-mbssume 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 ,qyyr;u3 ss h1c v+n)py1 (ebaHz sound, the velocity of a 200 Hz sound through ai)r cv;1,(qn 3aespb+ su1y yhyr 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 400 Hz sound, the wavelength of a;z2cvk:i+w1qygs3uveq +1 s a 200 Hz sound in ak2ie1;uv qsv ++3swa1 qcg:zy ir is

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations witht 8ljb smhlox4 (o*q6( 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 frequency less thanhe6wq.3h bcu3 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 un2lcht0f,x nw5ex2dp: w73k auq4je: diformly in all directions. If you move to ap:j2dthu k5lecx,qa042exf n d 3: ww7 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 proportionnaa+.ucs;,4 lu2d)yfwa/ / bavph 0lhal 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 p3 xvx0;-id:hvmvfg ;uoint source at a distance d from the source is I. What is the intensity at a distanc:;hd xvxivv3m0uf- ;ge 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 xm; -+lg8ciyha sound source that is radiating equally in all directions. What happens to the intensity of the sgcyh-+iml;8 xound? It reduces to

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 all p+)9g(c0fsvxti h z2u dip2t)v c0+hi(u 9fzs xgrections. 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 increases as a souvt : gqxsuwdkr,6uu(l 45bs9.nd 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 to*1,sym;i-9l, rkm pcce6y tr wne. What characteristic of thelstrmekp *c;cw -m91,i r,6yy sound increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudnvrq bz;fthf97oknjo5)z 3*1 iess" 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 "pitch" of a musical e( 9 ffzx5ose;nc7z7l 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 kdhvv n3r+r7t56fyo: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 fqu bfis.cjl/ry x;)w ai+0 /2waves 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 anu*7l d8rrj m w6-)lcz guitar string and the sound wave generated by the guitar as a result of this vibration. What do these two waves have id )ruw n76zcm*8j llr-n common?

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 whichwrkm8 u9mjcvy60ydogzj (7 a)7f 3a:e 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 length L. What are the wavelengths of the asws+k u.i; c9three lowest tones produced by this pipe?k .;ac w+ius9s

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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. Whu8voir / 4zm8dm zq4;yich one of the following frequencies will not resoimd;zu /8mv4 yrq8zo4 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 is resonating at its fund:3ipvv/xg6d9 dr8u leamental frequency. Which statement ie p uv3lx86 i9rgv:dd/s 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 end and closed at tjlnhk y) 3u94the 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 wa 2fe ;w:jlfgoe- 3lx t1ln97sfvelengths of the three lowest tones produceft7f29gl3xlsej 1 ; -: oelfnwd 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 closed pipe of length L is 2/8bzitn 6 l 56lvsnvqfqw)c3br y5 vbn6n 252c00 Hz. Which of the following frequencies wilt8 sv2 wbbz n356y 6nrqf5lcnb/l25i6 vcqn )vl 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 fundamentdbp4x r4 k)+6eoggpar:o (5 l2awgol+al frequency. Which statement is5log:a+ 6opreg(+2g l)dopba w4kr4x 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 drive2 t:3z 8i(nbgbzvz b3un by the same source. Each speaker produces a tone with a frequency obiu:tg(bznz8v 32zb3f 200 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, txw 2udll v*68wto), cthe two 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 together and a ;x ) glx7c i2.v izqca4-(kughparticular beat frequency is heard. What happ l-)g;cc4a q ghv27(.ixzuikxens 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 explai9,a:kjaq, 6oadm wsm8 ns

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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 ob.c/t z.w/0x, mrcpwfjserver. The frequency heard by the observerx/0c wmrwfjz,/ t.pc. is

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 stationariqm;4tm ah :v*y observer. The frequency heard by the observe q;hi 4:mt*amvr 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-speed, its half-angle will decrease by2rbkz zx g77e: a factor z7r gz7b2kx:eof:

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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 lz6a8xh)g/g9i bh) lyis the air temperature 8hlha y9g)l)6x/zgbi?

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 aii 8,x cc-.divkr 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 s6pf; e7/mx tnair is 340 m/s, a bat emits a shriek whose echo reaches ie6f7 st;p nm/xt 0.0250 s later. How far away 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 echo in 4.00(p6u;s pba0 uk 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 lig cjs:y i5 sf(hfs4(5thhtning, the distance to the lightning strike is abou(4 i 5jstf:5cfhsysh(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 tah687ycg h+g 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 hear the splash 2.5 s later. How dmx6f9cq 9 b-eyeep is the well? (Ignore air resistance, and assume the velocity of sound is 340 m/s.)fb6x-m99 y qec

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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 sj8 ao qkn-;jc(it 68(uep x;znound 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 88et v-6.7 jzdgx v.fo2rrispat $23 \; ^{\circ}C$ 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 iw9g*r (t7q:d mwmyn* qntensity $10^{-3} \; W/m^{2}$?

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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 7io6 9r1;s la )v hs/ap.udjp*r0-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 intensis+ay;da5 u4 t2j.w xmcc id,m bb :9da:+sq7jkties of two sounds with intensity levels of 70 dB andwq 4,t :usm5aa.b+7:c b k maj;ci+d2 j9syxdd 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 garavuts(i)kr- vefzz;m-j u9 e71 ge is 100 dB. What is the intensity level generated by one s)m eifk vz-9-et1rzuj u;7(vengine?

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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 equallyp3 1lrjig meui8jl i47*p32 wl in all directioil3 87r1j2gl u4ewpijm* li3 pns 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 distanceuvp q4 xtou :z.(wo;c .vd.rh(s3th9e of 6.0 m from a source that is radiating equally in a u .ooc vz9hd.re;tuth( (xq.vw: p4s3ll 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 uniformlyg be4 7256gwh,r -ia0byxkoyp distributed in all directions. What is the,y056bg awie 4ghk 2x7yprbo- 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 is 65 dB at a distance 5.00 m from a y5o;d9obd 7c h.fa 0labarking dog. What would be the intensity level if two identi9d50faoc hbol a7.d y;cal 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 isv kz3a1j 7+-x rclq2ek 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the sourjr+ckxke1 q- laz273vce 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 source is 95 dB. At what distadhz (+l3 v5hqgnce will it be 7zd(lhhgv+ 5 3q5 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 compdk rcme jkf**)kvd4a85 bn2e8lex tone has a frequency of 1200 Hz. What is the frequency of*vk ded5 nbfkj)rc*a 2 ke88m4 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 900mfc4p400pyes Hz. What is the length of the pief4sp m0py0c4 pe?

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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 :/bywbzx3s 7 zL is 400 Hz. What is the frequency of the lowest tone that will rx7yw :b3bs/ zzesonate 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 m9 xium8 n+(cs.ie)xi i. If the velocity of sound in air is 340 m/s, what is the frequency of thxix+ 8i)icemn is. (u9e 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 thet/t: rl283gd p xo0hct 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 frequenn +( b3,x1p0erhzfpe ocy in a pipe closed at one end is 330 Hz. What is the frequency of thexfe+ z per1ho3b( p,n0 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 w xfc7 1o0ndja8ill have a fundamental frequency of 60 Hz on a day when the velocity of sound is 340 m/s?d0 1a8jnc o7xf

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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 who4xglxu 7y)3v ere 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 wheredn -ksb54btp+ 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 w8vdwau7.4;mw:d ksr p5psj kwcb:(z1 hen the speed of sound in air is 340 m/s. What is the fundamental freque rdjs: (suwdc5w1v4 k z pm8w:.7kapb;ncy?

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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 sayemu 5u6lu57 mme length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of the c yu 6m7luu5me5losed 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 velocit+duhb1i lqtswv mxzl5z6+84 9y dh,. ry ow8z4+d6y9+tmzqr duvsbh hl x li,.15f sound is 340 m/s. 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 and dri7 o ,nbbsq yfi4gd 9j/4f;rr,kven 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 soun,rfyoq9, bg s4r7;jbki/fd n 4d 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 aqp369xr0,hgyxrpybg1j z-w 2 nd 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-Hz tunin-pd ux -xo0dub6uf4+pilj;p 8g fork to tune the frequency of a musical instrument. Ifl -f;pupub+p6d-8iodx j 4 0xu 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 produc:sbsw*hw e+/led by two horns are 6 m and 7 m respectively. What beat frequency is heard when the hbhss*w/ :+ew lorns 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 an orcho6w-ec8 ns+b)ux1ln)c srt )aestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension of one of the strings wouldbnc1) tlsuon ax )6c)rew-s8+ 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 1e0z, ch+mzvg-Hz sound source at twice the speed of sound. The observer hears a frequency m0z1g,+ he vczof

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source (normalc7zec.t e, ey )ptkqr;.iq*m- frequency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The obse ;c,tc.qpeze te.rqyk -i*7m)rver 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 m5w5uqff:3n* (rqej2 uvy q+ gooves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 3en3 f:*ufuv(+yw 2q oq rgj5q540 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 sif)n +of.ej3 -0vbwf cfren. It is traveling at 35 m/s on a day when the sp vwcf-03b o+fj)enf. feed 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?

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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 iz dbi f x 9mm3u)44jevsx,+1cobserver when a train approaches with a ,4ue43is vx) i+mm1fb 9zxjcdspeed of 30 m/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 blows its 400-Hz wh er u:els*f7,2z+ sqaristle. Take the speed of sound to be 340 m/s*resef 7+ lu2z,:aqsr. 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/r 8 r4y-j (sqivhii/*4s4 rhjbh toward a stationary train. The train blows its 400-Hz whistle. Takej4srrhir4ijby iv q*4h(/8s- the speed of 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 you at 120 km/h. The ss2 pmi7 ,tm/jji5 d7ptrain blows its 400-Hz whistle. Take the speed of sound to be 340 m/s275/, ipjs pms mti7dj. 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 whis hjodks*2rx 9(tle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frer(d92kox*s h jquency 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 ib-r,umd/r fq 73o fw5nn air is 340 m/s. What is the frequency heard by an observer if the observer is moving awayu nr3q7-fb/r 5fw,omd 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 Hzb .wrirc* o9;5 9oioyw. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the9owi;ic59 .obr*w y or 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 avcwf81j 00aae.use5dj w q :)signal is sent out, and a 42-.v1eace 0f58aj w:0sua)q wjdkHz signal 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 supersonic aircraft iszdgm*ir)d k2c xjci( va:6tm)5 5 /epa $60^{\circ}$. 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-c2 bcse s7y-d4angle of the conical shock wave fors2- bcy edc74smed?

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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 with auq:otq/ / gy0x Mach number of 1. :yqtx /uq/og005 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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