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习题练习：Physics Unit12: Sound
本习题练习试卷来源于无忧得胜-网上国际课程 (https://5edu.win)， 为试卷打印版，您也可以在网站平台(https://mail.5edu.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.5edu.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: admin  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 false stateu,ed 9i 4jga)mgj:o 9fment?

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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 conducs3h0+a; h lqq .33643ckov bfwed shhcted 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 roj6g33s(gc slke+78f bd2 7b:rvs vjo fd?

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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 r54k etnby53p air increases, what happens to the velocity of sound? (Aey4tb pn 553krssume 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 sound, the velocity of a 200 Hz sound throvr.p kwf.f)5c+,v rh xugh air .+c,5)frkvrf pv xw.his

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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 wavelengtm .u9oyve49 kqh of a 200 Hz sound inmv yo499kq. ue 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 with f ojyznnpyr+s:4( 7c oni -m u57zqh)4wrequencies 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 than,i5l:j42 yhps lhl6se 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 sourcep-nvi3zpu3 - rlg0hv; -vh 4rh is emitting waves uniformly in all directions. If you move to a poin;3upl3h -vvrvz - 40gr-i phnht 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 proportional t4gv)*eycvmlc 06l*tolczs t w18xi22 o

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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 gga) j0ho uiek /f;qt6 );xif:a distance d from the source is I. What is the intensity at a distance 2d ge q j: f6g;kui)/t0);fiaoh xfrom 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 tx5q 1 lyc1ripbcu*j5kzf ,,4nhat is radiating equally in all direc*r4nju lzby5p 5cc,iq1fk, x 1tions. What 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 geg9wk.4bw 2- sud omtm 2k/2wa sound source that is radiating equally in all directg2942 w 2bwukw-ekg. tds/m moions. 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 sound becomes lo+al(fhym n)(f,d:wrivi f3.1vpsri)uder?

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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 characteribw 7feq i+m3hkz0ly 8+qc8 z)pstic of the w3c pqh+f0ezb8my lq+8k7z i)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 "loudness" of a musical n22bw n jrr y t8.ivlyr,g99t6jote?

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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 music)m9w;6cn.wtsi 73 x 9bwl+igny 4 cdmual 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 waterdvue51o3pq tdxi) z0r :.bm3 p

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacemer0edc utw/:,r.pdb 2(1evqf vnt 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 standin 6u9ezv5;1 tx ukifk g4b5,dmng wave on a guitar string and the sound wave generated by the guitar as a result of thg4eb1t x6 funuv;k,d5 kiz59mis 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 oo7f; ar*v) fac*5t84we yryx:lsma9 r pen 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 pip5:u0kz p 6a:efrv5yakq6: :kp*x + cpbb uqz/ke of length L. What are the wavelengths of the three lowest tones prx a/+k::qpyz*bv:05e5r66 c pkpzqkuaf: u bkoduced 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 uy ca 513g/jt j/;it2x 3fr6e6ay4tltiesuz +length L is 200 Hz. Which one of the following frequencies will not resonate in the same1r y 5s x aj;j6zf6cleiy t2ati3 te/3gu/t4+u 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 fundamental fr voabkh)zl7dd 54m);8 rdz z(tequency. Which statement is correcdz7t;)v )l a5rok(8z z4d dbmht?

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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 theq :rp2gvbw *3+nqz x7t 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. 1-8grq +0hqic)g7jw a4zo)gqd cai,e What are the wavelengths of the three lowest tones produced by this pip1 -7o0w, iazhci g+e8ag4cjq qgrdq))e?

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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 izo sxl5qk ;z gpk0/+x9h:c7v) -izwn in a closed pipe of length L is 200 Hz. Which of the following frequencies will not re0o:5iwnkvkh c-/ +7z ;9gz lx qx)zsipsonate 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 fres(pcx :6 ia*zpquency. Which stateme6z* s:ip p(caxnt 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 ilfkt5df+s (s+m7+vt speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 mfklt m7sdi++(5+st vf /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 sz l/7(r thm- , sbfn.:kmnx0iiound 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 particular beat frequencyrknfi r gm jiuh-z:,2kl4,ann70z;j 0 g 6iu*h is heard. What happens to the beat frequency if the frequency of one of the tones fn2j: ri;4uu jhi m,0k - lagz*r0 zknn67,ghiis 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,p 4+uo 5 /*xygjsai vlwl82zrlains

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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 o:hyayiw; aw;pw:h b4/ta8*h ibserver. The frequency heard by the obsbaiw:w8i h t haywyh/*p;:4a; erver 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 frequency heard b1orbha8 *7eg ods(:vs0ieh 25ykfs(xy the obsy27afki* rs0 xegbvhs:18ds 5((oohe erver 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 ) bh 3a64s-*jszer kx 9:mixucwill decrease by a factor o hmsx:cs ij4 bk-x)*ea6u3rz 9f:

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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 ko n(et,l1x6 ciHz in air is 352 m/s. What is the air ol ei,16x (tnctemperature?

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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:kr :;rncc f k2ipr+yaa-+yo2 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 340 m/s,pzg *a/f i;m9e a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back m e9g /zpa;*ifthe 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 cvb) eu8vn *z5d:tfr4 9 4wbiyhear 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 avtytj ysbz,hf ). s8+5 flash of lightning, the distance to the lightning strike is a8 )5hy,svbstjytf+ z .bout

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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 hqzr nh8,ve,;h,v7vi 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,n.5rvdd,y dz ik+e r* the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sound is 340 m/s.dyr . +ernd*v5zk,id,)

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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 4bukv z5pj31w3p *oolfrequency 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 0lce do-+) oa 7m;,z0nqubutyq ld3 v8$23 \; ^{\circ}C$ 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 )(d i5wkex ykr:/qnf )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 sound?mw + nwm*.dmj8

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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 intensity7lmj 7gt b fpxr.dlvp9z9u*-/l,a z4z levels of 70 dB z,g pul zfzl*9j.7l/4m9 rp7v-xda bt 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 10cnfp68d, 5xdq tlo+*f0 dB. What is the intensity leve+ndlp txff8 o*cd5q 6,l 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 x3gtugj+aw cp ,yz 7)0of 6.0 m from a source that is radiating equally in all diu+w,3g 0gt7xjcp zya )rections 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 equally id8 4zptua(8 fgdpdb3 pk* zoa+sy*5z8n all directions is( 8y+4b f5k8 dd8 gpa*dutz3pz zo*psa
$6.0 \times 10^{-10} \; W/m^{2}$. 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, whi+kcft/9 q6 qpzch is assumed to be uniformly distributed in all directions. What is thc+f9 pz/tkqq6e 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 pgpleico,u;gk 7z 3 ,;f-b*ig a distance 5.00 m from a barking dog. What would be the intensity level if zfpg;ueg- *ck ig oi3 b;,,lp7two identical 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 60 dB. What k7g6ae7 f1zbhis the intensity level (in dB) at a point 2.0 m from the source? Assume that the source r7z17fegak6h b adiates 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. Asz i*q+82 mk:zhg0qev tsy;/wvobx6 3lxtx7)t what distance will it x ti s60qy37t wqx / x;m2eo :bs)g*8kvl+hvzzbe 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 freque6g ,g/ y8g5ix(i khmbjncy of 1200 Hz. What is the frequency of the fourth hay8/mg,5kb(h ggxi6i jrmonic?

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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. What2 p8 *cj:yf 2fx sevdws/u46sq is the length of the p4q */pf2ejy d2 vwfss8s:cx6uipe?

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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 anl -:koxq/y jp,6j(mi5vjjxq1 open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate ipxv-,oj : 6iq (kjlj q1/5jyxmn 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 zxa6xq4fd3h)r; n v-z 0.80 m. If the velocity of sound in air 4 x d-nz3r hx;v)zqa6fis 340 m/s, what 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 room where t( xi c:al:utj*he 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 aa epgemx, g:c,k1i-v*(na p5ut one end is 330 Hz. What is the frequency of the thmg*,e1 pp:-una v(exkc i ,ag5ird 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 ut3 372 eyeqfndzoz5-end that will have a fundamental frequency of 60 Hz o yd7ote z5n2fz-e qu33n 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 room6fdd( gsn6g6dr,(j*exk:z1 f/t k qcn 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 wher cewm0 d)r-7etiyk,q+e 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 dg:h7t xdcu19 played when the speed of sound in air is 340 m/s. What is the fundam 7ugxhd:t1 cd9ental 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 the other is closed on o.;+)p5fyakp 9kgs/jxjm ) xqtne end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of th jm/pg; 5 a)sqx9) fpxy+jk.tke 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 freq35et r6h ao-8z(g .dezadvo+k uency of 800 Hz in air where the velocity of sound is 340 m/s. Hokaazr o6 h eg (ode.z-3vd+t58w 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 sidfz +iu rry7.nm*d98 ()i+nxxmg ujr c8e 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 difm++ u.m)rnc y9igrdz 8ujrn(78 ixx*stance 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 Hz5 f,j urj22vz ,6ixob6hd)xha. 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 frequency of a musical insuu,iao8z(w x4trument. If the tuner hears a beat frequency of 2 Hz, uow(xz u8i4 ,awhat 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 respec 18p sim4b)er/ q-bhit w;nu8wtively. What beat frequency is heard when the horns are sounded on a day when theub8sip h-nri1eqw;b)/4mt w 8 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 pr uv,5-rrlm5p 26 ic6yonmegp:oduce 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 wo6c,v pl y5iroumgrp2:6n e5m-uld 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 twice the speed rx- zx r 2sf0)nwy phev1e),x)of sh1p w)) ,v)fzsn xeyx er-xr20ound. The 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 observefgi;xx;5h**afq k5)nsj;ei f fnk. ,rr at one-half thea;.nx, 5g*s j5ifffnf rh* )qk xi;k;e 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 listenjsf qw m,f.+0smw31l mer moves with a speed of 30 m/s away from the source, what is the fr j+s1lmm0f. s wqmfw3,equency 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. a c /adr457uhv 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 obu c/a7ad45h rvserver 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 observer when a train appro1f0-d utkwn;l d(vtw9 aches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound is 34dt0lv( 9;-kdtnw fw1u 0 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 blokh)mn)z ole4 /ws its 400-Hz whistle. Take the speed of sound to be 340 m/s. Wha n4koeh)l)m/zt 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 stationarc 32w.cz euull84sw1qy train. The train blows its 400-Hz whistle. Take the speed of souwuc1luz2 cs wql48.e 3nd 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 train blows its 408 8dc/xvmmyv8nrl( v. 0-Hz whistle 8/m lx8vycmn(dr.vv8 . 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 120t:wx7l6p1n os1gbcy; km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to;7xlp w6sn:gc 1bty 1o 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 the speed q8 9)mjfchb)-xg n/cfof sound in air is 340 m/s. What is the frequency heard by ancmhb) g 8q-x cjfn/f9) 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 horn is 500 Hz. Assume the speed of sound mxb*. ylg/ s5wlx/ )cf.jkg r)in air is 340 m/s. What is the frequency heard by an observer if the observ lkbwx/.jmsr/cgx) lf* 5.y)ger 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 sigxhiy* qc u8l*;nal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the objeq;* uiyx 8*lhcct 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 waf x79g6r(zw eqb fgqwmv5pe-) by)j0)ve 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 kwk o+ih -c8yj(y6)lghalf-angle of the conical shock wave forme yhki86)k-wg+c(yl j od?

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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 Unithd/fc+ j4qyg8d kx*ft )ianb5a0j, 2sed States to Europe with a Mach number of 1.05 where the air temperatxg4 )qcadd f f/k ,i0+nb8y*ajjh5st2ure is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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