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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 is a false statement?( mk wsuc6t f/n7qu:8r

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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 con 6+ai(6guig8:zrr(k ooz ljr;ducted 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 rod9al(1ptah iqokn 8 8c-?

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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 thb0byxgx k -.c-4lpl) y39 wmca/ oe1lze air increases, what happens to the velocity of sound? (Assume that all other factors r.c lzbm 3-cg 1o/x ey4kp-aw) xlbl0y9emain 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 jxyw :tb3en7s:jm:/)usptcx s( n./ma 200 Hz sound through air ic/)eyb j:n:tusn msp(: 3wxmt.jx/7s s

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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 oful dhux;x .,fm *an+f- a 400 Hz sound, the wavelength of a 200 Hz sound in x.h d fa;nxf*ml,u +-uair 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 gregr --t y8p-rjrnrs- ;water 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 freqp)mhzwm:f 9w,h 5r+ tpuency 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 -ehe4f,qe(i/ rys ojys+w:j)f kff .; directions. If you move to qf jsferi:s/jfyk- f4e+y e h;w).o(,a 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, intensitl4 mlsf dxr(htxe6 tv( knzr6; f,2,0my 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 source vzcg xm gh42674exy 3vis I. What is the intensity at am x2 xczg4e3g4 6vhyv7 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 from a sound source that is radia8 i1m;-mmeujsv l-p docs;y/,ting equally in all directions. What happenmymo8p 1ev;l-iss ;duj - m,c/s 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 dista-6pcvsh0 e*d )w ,(t96a,umphqnl kfw nce from a sound source that is radiating equally in all direu0wp h)dc,tn e *,ps6q6hw a(k9vmfl -ctions. 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 followingz4otmkpj.8v2 kr*z9kp n0x z7ty6 7qb increases 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 characteristicnvb0(twj;p,* bj);ulpr*b )n v*cg aj of the souna j;nlp bjjpvu*vw0;*),)c r(b*nbtgd 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 musixaanj3b x831x2l/wt:pz cd c)cal 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" o 5ykiwu3:zzeab(7tp91kl b v8 ex:u)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 into w55ua2v1 hyexler g72 j muy/n4ater

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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 p0ykvk,rh-ogye7l-/ 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 glcn: f :lmreea2 jyt+;(m ,:ogenerated by the guitar as a result of this vibration. 2g+ efm:tjrn;ol,y:l (mce: aWhat 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 w.no.cv/sp :y e jh1(fwhich 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 wavelehe4za72+au, lsi ,kcod o e//ingths of the three lowest tones produceze4l,k 7 + a/oi2uo/cai ,dhsed 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 opot* *xge*f2 xyen pipe of length L is 200 Hz. Which one of the following frequencies wixyxot e*g f*2*ll 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 resonating at its fundamental freq2cst,tmizo+)m(v,k k uency. Which statement is corre )os,v+(m, mt2 zckiktct?

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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 wh 90cb4,dhdj vnich is 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 aret9yo.c(z li v-;rtd 3e the wavelengths of the three lowest to ;vt.ioltcre-d 93y(z nes 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 pipe of length L is 200 t:im306wd v ac,wtfb8Hz. Which of the following frequencies will not resonate in tt:ift 3 w,v6a0 m8bwcdhat 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 8iiibme- g.t l7r)v5y its fundamental frequency. Which statement is co ymgl.r-)5ivib8e7 itrrect?

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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 tw:f;op q*x ot8k-(jogymtgu2 *o 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 m/s. The personjtu2q:*m 8-*og tfgop; x(ky o 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 (o+5yu,nq ago -n *tsasound 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 an8hr2uo 8h/f(q gghyn4ad h(3cd a particular beat frequency is heard. What happens to the beat frequency ( auhc84dh 3grqn gf oyh2h/8(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 explainsn *c0s91udeby

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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. The66ur- gxkgg4aolk 4h 9 frequency heard by the observer x k lko4raugg646h9- gis

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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 fromnqrth9-h z7 u 9crt.)i(z erq) a stationary observer. The frequency heard by the obsh uziq(t9 c-)z t9hr.rnqr 7e)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 had- th;ji (axe* /tm7pzlf-angle will decrease by a factoejt (iad*m7/-ptzx h;r 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* 1 lea5 zukyh3rayu// frequency 45 kHz in air is 352 m/s. What isu/ *k y3are1lah uzy5/ the 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 spe1d09guf- irty: d1e rzvcmbewuf4 .f 3g6dh/: ed 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 emitt5gv k7qyc (i6s a shriek whose echo reaches 765k (tqyivgc 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 temper uu y+:ox 814w8wzorh9oxmu8mature 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 se5:j oqw 8tiq/ru tw97weing a flash of lightning, the distance to the lightning strike is aiq w87:twq5w/ t r9juobout

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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 clitk23c3n .i1citzbqhq moe8q: n 6()ejff 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 we skk 8gxbn k (6;pw0r7c7j1ceall and hear the splash 2.5 s later. How deep is the well? (Ignore air resisesgx(wkcpba ;1rkk6 c8nj7 07tance, 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 airte xxlk/.0fxba h47s- zj s;wsr5z09d 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 aienevh*u fux*b9d1+ 84bb:gq d 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 b3u:4 ;d x)xuziuvha 6a 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 lht w:1s(kh- o8b0hlbof 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 levelsvgumm: 4 :;web of 70 dB :mb;v:w u 4gmeand 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(r1n5 3/ivm6l o4b )paru pnbt. What is the intensity leva1 ro)p4bv5 / bi n36l(ptnrumel 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 sourg xvloi1l mcn+b 7ige0+9z8 w..m;sae ce that is radiating equally in all direct gzb +7 xnm8sic0 wve+a1;ilgo9.lm.eions 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 eqpb3 n2atg63e;.i sa br5g:ej vually in all d ee .6jr3anig b:p52 s3vb;agtirections 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 ki3 ) .jxl,mi aucn*b/1 mW of power, which is assumed to be uniformly distributed in all directibiuj mxk3nac,*i/.)l ons. What is the 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 barx pt8hew,qdvl)zxb *2oz 1e 9wbe77 +zking dog. What would be the intensity levebho1ee zx w,z) wl xpv728e7q9 +*bdztl if two 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 sourcw wjee swrr 5d6xh-+5g/l ; +ula,rv/ne 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 dier /+l;xd6v/w- gar ,5 rselhw+nj 5wurections.

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The sound intensity levelkakg8n+. cyn ,+ dyz-u 5.0 m from a point source is 95 dB. At what distance willan+,-.yk zc + 8kgydnu 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 oym lmg9 12t5cbf 1200 Hz. What is the frequency of the fourth harmoni9bclm g1t52ymc?

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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 ope0vmsvv,pz h;3 n pipe is 900 Hz. What is the length of thvhzv sv,p 30;me 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 dp/k5kl.eh5l0*qyc epipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of len*p0k 5el5l h/eq cy.kdgth 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 the veloc+x rrp.*eu lxjcwtbyc6-2g 23ity of sound in air is 340 m/e+x6r*.p2 r lwx- jbyg3c 2ucts, 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 w)0cbxhk 6hqfx*ka; : chere 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 1nl6hpq6ub6 oy0 x-(cqcikz3pipe closed at one end is 330 Hz. What is the frequency l6(30hp6c6czk- qqxioyb 1u nof 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 pfm6lft6 jr0pmqn9: 1pipe closed on one end that will have a fundamental frequency of mnf j61 mrl9tpfq06:p60 Hz on 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 room where the temp,f xo 6,x i*bg2flgjd/erature 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 wherd74-61gnk:ripr q/c r:7dp: upd wzwbe 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 is0tspi8 jxg6c24 koo6p played when the speed of sound in air is 340 m/s. What is the fc xoi 6kp0j4sto6g8 p2undamental 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 opdy)-a ofur-mcyx 87y)en and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental)r 8y-dac)yumo -x f7y 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 t0 abv m(c2zg5dhe velocity of sound is 340 m/s. How much farther back would source 1 have to be modbmg av2c5(z0ved 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 d*p-pd l8qgcn,vi27 hye)hw2s 8yd ydbxi8 z39 riven by the same frequency of 500 Hz. If the distance from a ppg2y d ysic38zd9)8h bnv ,h*lx8-qi2yedp w7erson 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 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 beat frequenc7smblb476py aw 4+uu oy?

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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 f -egt5yzdk z+5e/p jk ,-ucxzopv4 *e-requency of a musical instrument. If the tuner heaozzje*e4kx-d u/g 5vpek,cy-z- 5+tp rs 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 produced by two horns pnylkigs1 hp2p4x8vr+q x y9 n,2+y2 lare 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the vylq2n ,8 rxpg1 n22iyv+x9sp4ply+hkelocity 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 any;jv vq2mp 3xa5wc8m7 orchestra are found to produce a7qxy; vv5p83cam 2wm j beat frequency 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 sdk;am3 +w uwz-q0 v3yzource at twice the speed of sound. The observer hears qvw0au33m +zzdw ky;-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 obf3og8vah6c9 j36os+tz+ vix jserver at one-hj69 o3cvz6afvt s83jogh +x+ialf the 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 listener(gl 0h7t asu k85maq(l.ay /qh moves with a speed of 30 m/s away from the source, 5 ugla0s(lh . ty7aahk8(qqm/what is the frequency 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 sirenrzxx7q0qxdam6s;*ky ti 7,x/ . 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 passesmska*di6 zq/y,7txrx x0x;q7 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 3bmza*/ag 9 mvheard by a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz an9/* mm avba3gzd 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 406q vqgin54xb 7 y u-5nsu1+xecv/ eg0e0-Hz whistle. Take the speed of sound to be 340 m/s. e+g yg4bi7s -vqx5 u5xvqceu/ n0n16e 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 yv-uzb5xg* hga5cq+9toward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be y a*hvg qb+9-z5uc xg5340 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 400-Hz whisy,hii;f 9(zzqems la2-8gi( b tle. Take the speed of sound to be 340 m/s. What frequency do you hhfm z-gs(q(eii;ya 2b 9zil ,8ear?

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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 ju; k)tv1 f,u1r-8 evnmbk cf3at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Taku-f e cj r31km;,tn vfvbu8)k1e the speed of sound 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 hd,f tdrp;i c j1jk065w./wam8rxg2p porn 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 moving away from the train with a speed of 30.0 m/r6p,mj2wca. x f8j k5 t1w0dgirp; dp/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 o/n e ;f)1orrwsound in air is 340 m/s. What is the frequency heard by an observer if the observer is1no)/;fer w or 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 ,6cjhgx o+ im;* my da-(p (nrhx:a04dkpa )rhof an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume aa*k j+(:mhrdoadpx4y0 (6p,xrni;c -hh)gm 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 ica(5woveyzu 3 ;o :urso,j2h8s $60^{\circ}$. 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 ofj78n2) 1tz4qb zym/ibht p,k p Mach 1.4. What is the half-angle of the conical shock wave fo1z7ib m hz4b k 8ntjpt/pq2,)yrmed?

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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 fromykg7w4y fc 4s9pz(sn) (su79l5hgrrp the United States to Europe with a Mach number of 1.05 where the air r s4gzck y )wuyl9 (9s4f(np75h7spgr temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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