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习题练习：Physics Unit12: Sound
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)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://51fly.win/test70.html
 作者: physics  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 false statembw;yx0sk* hn1xu;sm j5 7w o)went?

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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 througv;rvoh*ky2s w9 j6 (adh

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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 sn2(eua 5 :wiz+h6kdy (be+mvsteel 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 airlw:jbak.c645(4 di kii* dqz +l;bn jj increases, what happens to the velocity of sound? (Assume that all other factors remain conibj+*wj4bd 6 djcila iz4lk.;q kn5(:stant.)

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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 soz/ -ty3 bf;jyeund, the velocity of a 200 Hz sound through air iszf/ tby3 eyj-;

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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, t+kskwc 7 y-5b:t )t )awkoa5)f l(xbewhe wavelength of a 200 Hz sound i)kl e(c5attb okxaky) -7b:w)w s+fw 5n 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 fghn238io,hul:abe : k ;t : kcdoj6*ujr7gt:grequencies 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 21 -sprdn em/6/nhv8 1d2dizm m0 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 al(j.ve ) ftj(y5c oyms2l directions. If you move to a point twice as far away from the source, the frequency of thce5ymj(yfj(v. 2)sot e 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 proport cf x09x s7l1ulyua)2tional 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 I. Wh chf/:bt z7na2at is the intensity at a d :tbf7a/zhn2cistance 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 equally e,jfka l;3ea4 in all directions. What happens to the i ealf3;,eak j4ntensity 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 9y:nj9z2ys8n(hjg el(zq 5g bequally in all directions. What happens to the intensity level of the son8hnsg9 z 2yeb(:(j9 5y jlzgqund? 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 increase fv73y ) eot ga,xkrsed*8nd,(s 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 z z*kkue i:3g(o+qc 5evk5ysaadr5+4speaker emitting a pure tone. What characteristic of the sound incz+ z5a+eyk*i:3rda5 ekq(us o4 kg5cvreases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" 7bkejqe-t2d(g vxk 5f9e(5tw4k n4ef 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 "pitcgfa ruzu3e yxj aj5cv29 8q--t71zc 7ih" 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 u qcz0t(xf mo8l-lb/+ ;n,3g( skxyxuinto 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 0 (ri6wla hpnk;lgc9m4l o:w1 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 guita te9j k:lwk.i9/y9q8u:i q)p;lshy1.um wmjhr string and the sound wave generated by the guitar as a result of thil y 9m jhhu;ke i8suw ./k9.p:qwtj:1lyi)m 9qs 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 open at both ends, xw g: gswi mtb,rkjx6o tpj9 :)b0.7+sthere

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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 three loo :(jaf+6qhf3 nqb0ahwest tones produced jqfon6f0bah3ah (:+q 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 ps5y dwz5 iim 9hm5k+8pvcv+o+ipe of length L is 200 Hz. Which one of the following frequencies will not re v5mp55ydi8osh9mzi+v k+ wc+ sonate 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 fundamental frequency.wi+6 h 3 rrzv7s. jnqk/z/7rag Which statement is cor+k j/nzisg7r v7qwr.ahzr 3/6 rect?

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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 tni4v t7 gc)f+vhe 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*a1- mlqbmp.ivelengths of the three lowest tones proi mab-*.p1ml qduced 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 resonaz s 9.+rbax1uo xe (oe0x*dxb/te in a closed pipe of length L is 200 Hz. Which of the following frequenciox+ osr .baux b(/dxe19*x0ezes 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 re5 0kd(kkgr8it sonating at its fundamental frequency. Which stkg 8trik (d50katement 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 drqjsp acc4y:f74 qb 5y;iven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a fpq4 s y7c:j;5qc aby4day 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 so+f j0+1sjth(fenkplx j (7m/wund 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 sound 5gputjrt1qsr+ p49g:ij5e w,ed together and a particular beat frequency is heard. What happens to the beat591g4jt guwe5,: rq+rpips jt 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 explainma18ety 4t(+y u, spwqs

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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 observglzyj0u30;ryq j .2i2+ qmsqaer. The frequency heard by the observerqqyjs ym+a qi02.r3u zjlg;02 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 stationarycp n; 2hkkmy2doz -p(4 observer. The frequency heard by the observerm2 kkyz- hp4cnp(od ;2 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 dki* fy-m s/9rzecrease by a fac*my/-9fkrsiz tor 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 e 9qf( doa+3x6rjivju*0 3fkn kHz in air is 352 m/s. What is the ofniu * fk69(+jvqx3rd3a0je 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 spe /g+lea ) 42oc3rzl7mfbk zs*zed of 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 sb )io2*v+ck1pz 5zg r*n:fyclound in air is 340 m/s, a bat emits a shriek whose echo re lciky5f:+1v zpc*zo*2b rg)n aches it 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 s. The temperature zq,n6 t9a sed5qc .dnj0sy2.b 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 o hig)f6-5,mmc n q zy6m6ftip:f lightning, the distance to the lightning strike is ab5iyi6, hn6p6m:z g-) ctqmfmf out

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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 cliffd;db:ebac vog8 (r4w h2cd*r( 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.h p/gdbf;j4 2x5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of s4 xhjfg/;2 dbpound 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.atszwua3 2fb n-hv73 of 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 ai5;vp om o, mwt,wz8fx/r 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 a sound with i80yv h8ew2uss q5r2 zvntensity $10^{-3} \; W/m^{2}$?

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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 qun 7hcs ;c :avi/r1ztb;p +.bsound?

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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 thee*-lx v zh:w-e intensities of two sounds with intensity levels of 70 dB and 40 vz :ew*ex-hl-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 ge,lfjqq o9m 7vc+9u t4arage is 100 dB. What is the intensity levelq4l o q, tevc9+mfju97 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 source that is radiating equallyee q k-,nfvawg138r-m in all -- g3qv8r1a few,nkmedirections 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 disbyc 7kmwpy:- q)eu/t nvw 4(n3/ 5hlqstance of 6.0 m from a source that is radiating equally in all directyqcuyw(4 :mq knv)htb3- /ewsn/lp7 5 ions 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 ofgo)p sx8 o0b,d power, which is assumed to be uniformly distributed in all directions. What is the intesxp do 0,b8g)onsity 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 barking dog. What wouc n.pgof0siw7zt b x*cuo06;3 ld be the intensity level if two identical dogs very close to each other are barking? n *3z ipbot6;o0cuwf0x7 s.gc

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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 sourna 09/ueikc16j .ju3dvog p x;ce 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 du60e3 /; 1njv xdciapuj9 o.gkirections.

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The sound intensity levelrtzjx0/9xd4rb is9ke1l*j-v 5.0 m from a point source is 95 dB. At what distance will idxb t1ej x-0rrz4k9l/vs 9*j 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 of lp 5 j,8pe2w;yjb;dht1200 Hz. What is the frequency pdyj e;5lt;,w2 8 jpbhof 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 yfib gclz0 3u9; j)g8rox )f/-ukoou9of an open pipe is 900 Hz. What is the length of the pipgk ocxiujlf )/ gyo ;83-zr09fub9o u)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 resonaii05fr7bui 7p te in an open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an7r5ub pi7i0f i 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 thq* y dlrnudop:iwy g5n4 (/2h1e velocity of sound in air is 340 m/s, what is t iypwny( no: ddl/qg5ru4h 21*he 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 the bty 1wf,mofd)/o (e3j a9*wgftemperature 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 at one end is 330 Hzrb yp*an+j2ne2 f4o8 ayo *dn3. What is the frequency of t *ne *ay3jod2 rf2ya8n4 npob+he 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 c)hl.3j n:vl pwa24/unpyeot(losed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound is 340 tnwa2)(n./ph eljl:3 ou yp4vm/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 *zgvub hq9*2 xis $20 \; ^{\circ}C$. 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 k uclbc:yk2vw*6-t r0 8nlsk2 where 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 when the speed of sound in ai hrf.l1xao1(ur iso1(uf.1x halr 340 m/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 length: one is open and the other is closed on j*pww1n h*1hdone end. If the fundamental frequency of the open pipe is 300 Hjhw wpd11h* *nz, 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 thed)wdf6+o - 8lht-xe( t3xprg u velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in front of the soue-rxdl8u(fto6 3 pt-)dgwh x+rces 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 side4yu1 r+xkwf7 m 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 distan+wmfkuy r17x4 ce 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 thjw r06pu9iz44sgsu 4je 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 t(6s4 l++az : ;fwhcd:y(2rojgvtaea e uning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequey4(e: lh+ aa6e+cwtd2;a :rsf g(ovjzncy 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 by7v c4e 1fwx 6rfdkq-makf/3(q two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity af /6(kqwmc - 134dvrqeff7k xof 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 foundx885je 5vd 7w6nrsyzh to produce a beat frequency of 2 Hz when a frequency of 660 Hz is plawd6vynr78hzx j5se 58yed. 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 station-u ,on smyt z9*6n.skuary 1000-Hz sound source at twice the speed of sound. The observer hears t*mzus s9 u,.ny- o6nka 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 obseltnp 4um.vvz8z 7e(:a rver at one-half the speed of sound. The observpav z u.4e7v: zlm(nt8er 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 o8u awlirax9ee3 ;v9h8f 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound sa 9i xeruva8;893wehl peed 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 on0 c-2zsfla u4 jkm-gr- a day when the speed of sound through air z -a20ku--cjlr4gsm fis 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 frequencymprhk6-p f slvt 0,rtpsakz;6 .8a2c7 heard by a stationary observer when a train approaches with s6c6 ,tf.vkhrtrk8p-0a7psm ;a 2lp za speed 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 towartj+y:8n vy19vj2 2rhrrlon :ud you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 3vlj: v u+nr18 yjrtnr22 o:yh940 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 towae ipf uh2v gd1/+5fdl+rd a stationary train. The train blows its 400-Hz whfvi5 +elu/fh pg+1dd2 istle. Take 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 kjqhj(ncm j - hu *q;k.w9q.fj;m/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequq* j 9n( hkm.c wfj-hq;jj.;quency 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. eqpnz,/5gj7y35 mu smIt blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is thsqn/j5mg zp,m7 y eu35e 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 of sound h-t ptzsx:uvhzwj:7 0c+ il-h-war5- in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from thsl-vw h-tzp0h+:u: xwr-h7z j tcai-5e 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 s 9; lp,- mn5avzejrf4upeed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train 9r ue4lf,-z;v5j an pmwith 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..ly hx2pga+so .wcz+1 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 moving?wsgoh y+zal2.pc + 1.x

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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 aiepp 0f*ln/mn2xlf 5 y0km0y9)x)v zvxrcraft 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 of the conical2ze-ak lp6zgirf .z/) shock wa2z)a6eg -zprzl ki/f.ve 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 witioc2-)3rp*qv lt uw t8h a Mach number o i wcu)t-8lor*tp32 qvf 1.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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