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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 stateme cd* p)8rg*v+a4u*+votqbxgo nt?

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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 thdm,)b /9(bbzd*w .yzs:icwb orough

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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) v +uu):rhtqpnv:3 br r*fpd/?

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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 the velocity of soulir ;a 24n2usox8c4yq j5e y e//8im smeeur,;nd? (Assume that all other factors remain constants2um45l4 ree ,uco e aim;xs8;82 yyinerq// j.)

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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 velocit*c h.55.cf/bc0oxd +es3a vu ozwnyr*a l:no:y of a 200 Hz sound through aolcyfvbc :ndn 0s* o5ra+uw .z o3:/axhc5e*.ir 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 200 Hz p9)du5coo,t 5 na k) w+iram1esound in air is eo)9a kncwa5 o1u)ptmd i5+r,

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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 great nn04ng0fc mg 657)t oipj anbgrg)-/rer 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 20 Hz are call c2 geev,8b:bved

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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 wa 2z;wpchjx r.pjz90a/p,2pn0daur 2xves uniformly in all directions. If you move to a point twice as far away fr/pj9np;z2.rx0 2a h u j czpwpaxd2,0rom 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 proportiti,: *wkbb 8sz cco;m9onal 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. What is tbotc4hw i(4w *he intensity at a distance 2d ft4 wchw4(*b iorom 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 distancshh;l 8;tt :tt i)1mmye from a sound source that is radiating equally in all directions.s:t h8lmt ;h ym);1tti 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 distakhow- e. k5mwua.8nla eu19+dnce from a sound source that is radiating equally in all direcw 8a e u5k h-9ku.1wd+lm.enoations. 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 +f(v)tvz6i +oaw ukv3ncie,o). m6 aqlouder?

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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 speak;k.m7 l qur+s(rgge, ker emitting a pure tone. What characteristic of the sound increl,q(mrk;g7k + g.reusases?

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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 musivq. 4 juwnyro4x3:kz ,ox4f( ycal 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 ;zhe;:cjr .2z )pxscd 8j4pconote?

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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 lfar m6a:sdd9bxzg /l 7)*/ikwater

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement waves are grucdby gn).x7b x 4q2kk8:;d

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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 generat;(mz4,2iyah ch 6ci0ntlm:1 p)ka uzved by the guitar as a result of this vibration. What do these two wmzkah 0u 1)zn:cl62p4avh , m;yi(c tiaves 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 ofg(xtcgs +(up-+od3ii 8m9ng9 (oamu 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 pipe of length L. What are the wave,r, f3ti5:7er z a3lal 4jixjzlengths of the three lowest tones produce, zl,j 43ixar3:a zl5iftej7r d 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 resongy n ;;iq6c0deate in an open pipe of length L is 200 Hz. Which one of the followicn;qde60;y i gng frequencies will not resonate 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 resonatihn3m . vlgn,1ec lb5-yng at its fundamental frequency. Which statement is colch 1l.-ynem,35 ngb vrrect?

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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 nq j6:u3ya,xt36zksptplw -/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. rdxtm/-nio6jcc z+u 7iw e697What are the wavelengths of the three lowest tonez 6 n9rumiiocw x6 7jc-/d7+ets produced 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 pofh p8jq.t3o 5)v, inpipe of length L is 200 Hz. Which of the fpvhf pi )nq5,ot3.o 8jollowing frequencies 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 /5z40* lvgq6 iepk9 enmc*tpk at one end is resonating at its fundamental frequency. Whic 4*5gepilkntmev *kp z 0/c96qh 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 speakers d aipet qrbvgb +i:j 49352 v+zjq6rzb3riven by the same source. Each speaker produces a tobb9gr z34q :pj+t65eqij3rv+ bav2zine with a frequency of 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, the two sound waves sc/fwcwd(4g:t ,)qvl; fg xk.b hould 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 frequenc;. 2ruc3ym puoy is heard. What happens to the beat frequency if the frequency of one of th3mru p.;oc 2uye 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 ex uxbg7.vzzmfd 2 lo--/plains

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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 frequen,mb0x4kyq8)nc gh v.j,,kj xzcy heard by the observer,4,jv m b8zxkn0j)x,.kqg h yc 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 frg1kc 4du .r0w,i p8*4a prqigrequency heard by the obse44,pcur*i.8wr gr0k adg pqi 1rver 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 ha7kku4cof0hj 3 lf-angle will decrease by a factor ofkc u 430joh7kf:

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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 sva k4grnc4gum 8j0j8 d9bkt: 7ound of frequency 45 kHz in air is 352 m/s. What is takjm8 gj c0:4u98gt4bkvn 7 rdhe 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 xq*)subi( s o3the speed 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 sound in air is 340 m/s, a bat emits a sml r;xk vq4..qhriek whose echo rex.rm. k4vq;lqaches 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 tempe)stqx- e;2+f : l*mcy* lpqfii;y/racrature 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 5du,;qq-+ n e po;aw*db.0 s after seeing a flash of lightning, the distance to the lie d-,*p;abonud+qw q;ghtning 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 cli ;1bg qj1eae+pff 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 bybe9 x0kb4 d4well and hear the splash 2.5 s later. How deep is the well?ykx94 bed bb40 (Ignore air resistance, 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 a sound wave of freq drnx,d6gxnl( k0 u.p/uency 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 airy *vd9 y,s4:jbi3 zdsl 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 intens;ply.v3y2p pp3f wv:cbp5 s1vity $10^{-3} \; W/m^{2}$?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensityf:w :su,wz9qbv agvq0h)sn e,0 5f c/q of a 70-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 intensities of two sounds with intensity levels7e8ylh n8(5kr*gm d rl of 70 dB and 40 dB?mn8kr8dl(7 er*l5hg y

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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. Wwt:( 4/wbpb ,gmcg)hq hat is the intensity level generated by one enginec4 bg)pm(: th/q ,wwgb?

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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 radiatbd2 q6ktd9t.eing equally in all diredtqdbe k.62 t9ctions 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 b 50tnv -t.yxpt q ii)gn(x (c;oy5wv4m from a source that is radiating equally in all direct0;n( x-c.wnyxy ibvgq i(t4)v 5t5potions 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.zjnuz9i2tj88 q i 4qu, which is assumed to be uniformly distributed in all directions. What is tu zj9828iq4tuz j. nqihe 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 barking dog. Wmq4c7 dv/2) tbws(o) : c* kvzzuc6fmchat would be the intensity level if two identical dogs z ) c74fc (2zvqs:ct6)/uomvkb dwm c*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 fan;so2+4pb lh )xiv g7rom a sound source 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 directions;oa+ns)lxhv bgpi 427 .

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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 v7z:zdm1)uqn wv/ u s0source is 95 dB. At what distance will it be 75 dBqsu0mn:w1/7vv zd zu)?

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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 frequenc m( y vk;ol:rzr6(nwd5y of 1200 Hz. What is the frequencz :nw65 ;lrrv(k(d moyy of 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 ofefl-*jq 69l eq8rx p9c19 pbsq an open pipe is 900 Hz. What is the length of thee b9rcq9 lj8s9 plqe1fq*xp6- 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, .xza/qigbuz+(nfl yxb 02tn*- naw 4 Hz. What is the frequency t( zya*nn / 2 zfb gxuq0wlxi,a.-b+n4of 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 len;tspsk7 2n konlb4k4*gth of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequelptb7;s4 4ok n*nsk2kncy 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 when52( 4n r8ja/pogxqogre 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 pipe closed at one end is 330 Hz. What is them7tn 5mlh2f5 n frequency of the third n tnmh5f5l72 mharmonic?

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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 od-c 8amt+:l ucz3d1uhy4(b kzne end that will have a fundamental frequency of 60 Hz on a day when the velocity of s:(l+3 yztd4h8d1u umabzck c- ound 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 tez7) 3:rsihbsj) abx7k mperature 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 m5 b vk,b**jvpwhere 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 kpqk.n)v46 ac in air is 340 m/s. What is the fun)akqv .kn4c6p damental 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 openm0 ia916 mxbnk4*zb4;zr ofyl and the other is closed on one end. If thez;9my 1 kbz f4 ln6bi4moa0rx* fundamental frequency 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 freqp3q2z5qj .z/ )vrpy xuuency of 800 Hz in air where the velocity of sounzr/ 52pvju 3yz.)xqq pd 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 byrw u f7 l+4:nlg/gr5zg 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 dete:f lwzlrn7+ 5/ru4 gggcts 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 vr sr23wrd6r7and 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 tuning f qt32p)jko yn8 7wetap2bcee c1 17/ework to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, 2t1 ) 7qne8bppyew a273cetjkwc /1oewhat 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 p 5+;d;yssyx+rfumjqu n04/ p6 m and 7 m respectively. What bend/m fy0ujrp;5sx +;+qps uy4at 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 an ory1:ekh3fn6 it,e km(zchestra are found to produce a beat frequencyyfi( zk6: me1t,3hn ke of 2 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 source at twice theuqihuf vpdg :*8/ 6pevrsj2)0 speed of sound. The observer heai h2qjrdg)v0f vu6u*esp/ 8:prs 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) pl0 vr9(qb* ovapproaches a stationary observer at one-half the speed of sound. The observero vv 9q*(rblp0 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 aw *vaq6.gdbj5 listener moves with a speed of 30 m/s away from the source, what is the frequency heard byd*a6vw b.5jqg 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 traveling atj nkmu36y uf3atnyo ,4p9 w0u) 35 m/s on a day when the speed of sound through air is 340 m/s. The ctokjm u6y u)0fnp3u9 ynw,34a ar 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 observer when a train approac:d7f204x9( uogi lzti feif,4x 0ddrshes with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound is 340eiud f4ixx, 0fdi27 g lzds49o( :rtf0 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 i -mj ,i3gi7 tcg+)vmc120 km/h. The train blows its 400-Hz whistle. Take the speed of sound toitmg7c icv-j3 m,+g i) 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 stationary trair0 mcct :y9o4zn. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What freqo0ccz4 tm 9y:ruency 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 it2k,hbn sg)jc :7u fag:s 400-Hz whistle. Take the speed of sound to ,g)2fc k7b:una :hjsgbe 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 km/h. It blows its wh k *5tci/*eng.lw:hi(iu ; zlgvg9 bi3istle, and you hear a tone of 400 Hz. Take the speed of s*e.klg5;vwn izc(9b* h igtl3ug/ :iiound 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 the speed of sound in air isw:,h)-qt lnp/f ftfi3 340 m/s. What is the frequency heaphl,:f/ f) itnw3-qtfrd 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 horn is 500 Hz. Assume the speed of srbh6w(j );rl:khfz a*ktz. 0gound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speed *rk;:a z0rt blh(jfgzhk 6w) .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 sigxeohcv*8 /3 6 xm.ty1anves(o-2 qyxanal is sent out, and a 42-kHz signal is returned. Assume the speed of sound isy*o x axeqh3ansmx o/vv2 6y.1t-ce8( 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;zai+a7ma 9co,qc o+aaq/ucyl 4 ,*z e conical 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 of the conicat61aafp4p ef4m g x9i)c *toq1l shock wavof t1 p41e9atf 64ai)cgq*m xpe 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 Unit2k r d*xy7g56s g*.5bofw igthed States to Europe with a Mach number of 1.05 where the air tempers w tg*i65 7f*o5gk rbx2dy.ghature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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