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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 is a false stated1k1kwxhzf uj c,n/ +2ment?

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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 a oqs m0l1/uo9 ;e4dqeconducted 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 iymd1a0 whc( - )zqwqmk+vn5j7o 8 g)lgn a steel 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 air increases, what happens to the velocity of soun.sc5ww 5/p(09hg ar rga h6liwd? (Assume wsp9r0 hiwg/ hc6w5rlaa.g( 5that 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 Hzjg qtio/08vk5+l b ap4oa.sf* sound, the velocity of a 200 Hz sound through airgaji5+8 f/qb oaso p.v0l *k4t 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 wave7ret* h)gu*t .lngi2,l c/ 4finztrw5vd2:a flength of a 400 Hz sound, the wavelength of a 200 Hz sound in air i.r *tgt)idgfv5*2ice4nt/ hna:f , uw llz72rs

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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 greamyx 7bf: 4i/mn7qx;rgter 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 lewtjz 1,zi ;li2ss 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 directvy2zd ;m :l(plions. If you move to a point twice as far away from the source, th2y :;dzvmpll(e 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 tougmmc9 -fm a0/

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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 poin f d:6e2zsk-e*7(eytvcfjdl9 t source at a distance d from the source is I. What is the intensity at a distance 2d fr(skee :e6tc-vyld79d z ffj2*om 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 fr,8 e/- wne,vbkps2-vcs sqg 2iom a sound source that is radiating equally in all directions. What happens to the intensity oeqvi n-,sb s w2-s 2/cke8gv,pf 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 t s,4/ 3hywm2lwj poy3lhat is radiating equally in all directions. What happens to 3y4w3y oml/h j,wpl 2sthe 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 in-46hzk:ks zz gcreases 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 tozv5jxi 5rriw-r1/ 53v (t.x yuaww,k xne. What characteristic of the sound increase5r1wvv k (-wiu5x,twj ryx z.i/a3x5 rs?

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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 muiw- tx5o/-u qrrd6 aa/rag,m-*xbn1 zsical 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 "pitchd.r7x 4hpet yu:j* f)w" 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 16*ird7o85 lzxu 2 a dks-nn-9dlcbtyinto 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 w d9)( 57nd4,eq+tcho rjpuja 7kmh9ni aves 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 str. wqj0u;k(1vl3fgg.; cbt ecl(zi a:jing and the sound wave generated by the guitar as a resua;vicbu3. ( :wq;cglj 1 (kt0lzegf.jlt of this 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 boes72cmzf-icub xd8 n/d3f8r , th 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 wavelen a7kbk 3ckh86w /8i+gv5hqjm egths of the three lowest tones produced by th38gbhak6 mq 8kek hiv+cw/ 57jis 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 fm kwc gxit/ ix(c81)q/9 sl+ipipe of length L is 200 Hz. Which one of the following frequencies k(9mqxisg ci/lw)/8cixt 1+f 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 resonating at its fundamental frequency. Which soxq0sq/y q* qfun u23.g) ak.itatement iso. 3q2u)f 0suqqgk*ia.x/n qy 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 th,pvgvh-5i-;; r0zej xc(syxfe 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 wavelengths of the three3qgks e f5ihihi-9+3l lowest tones produced by fgiik 3 -5q+l 9eh3sihthis 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 b aq,w-,maey *pipe of length L is 200 Hz. Which of the following frequencies will not resonate in th*yeb a,amq-,wat 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 en7w7vc v*x q9fpp6td3:nen -bmd is resonating at its fundamental frequency. Which statementm ft7p3n7dbv* venp :c6xq9w - 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 driven by the same sz;iu qw* )e* ytcsb83dource. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. uzwe* c8qy)t sd3*b;i 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 ia, wqnv0nz ) )7dazm2jee56hshould 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 sound0ql8rx4ja u5ned together and a particular beat frequency is heard. What happens to q8juarl5 x0n 4the 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 expd ;e lel93nf.q) iuw:w:saag+lains

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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 obser 6shybdr7 -jz(h)suk- ver. The frequency heard by the observer d)hk br ssh-(-u6zyj7is

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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 by thc q/gnj.9igk:uwvw -oa)2q5 be obser/jg) w. cg5kau:ivq 2o-9qb nwver 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 3lczw bztco .u*x /5g9its MACH-speed, its half-angle will decrease by a factor o9 3gz wxt5lu* zoc./bcf:

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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 ultrasoni -fluhlnbz*lym+vn,qz+ :,i :jf b2m1c sound of frequency 45 kHz in air is 352 m/s. What is the air tel*y,bmm-hli+f,vzfl 1 q +n2j::uz nb mperature?

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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 i:ae 9y;:ohc)2(xz m+mqe vhttn 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 xi -:5+axs+io)y byvbsound in air is 340 m/s, a bat emits a shriek whose echo reav5-i)+x:bs xa i+yoybches 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 4.00fa uhi0z).z/ea n92br 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 ligh/rz,6zkr n o/,ytn eu,tning, the distance to the lightning strike is /,r,nyo6uk t,nr zze/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 cliff on a day the tc,0ais w5dq7cemperature 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 lategr0.lzei.wqmf.1m f* r. How deep is the well? (Ignore aie0 glz fim1.wfm.rq.* r 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 frequency 500 H 2hhvo50t yqq*e p4,ymz 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 apt., u)q1lyl8 t*lnug t $23 \; ^{\circ}C$ 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 int8n1rb3f 2yy jn)yg,+ st x5gd(w igx/yensity $10^{-3} \; W/m^{2}$?

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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(h*cf+z ee +1x byjna;-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 sounz3vx3 t66vnw xds with intensity levels of 70 dB and 40 dB?3v xwt636zn xv

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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 garajj2odkpmmd51 :h, x *bge is 100 dB. What is the intensity level generam52k:o *x,h1mdjjp bdted 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 rhggr2-;f)+ rn 8syz gbdhv(- madiating equally in all directions ish zr(fr+b -g; 8 n2md)hyggvs-
$6.0 \times 10^{-10} \; W/m^{2}$. 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 k 9b69 tev(vivhi8 :iysource that is radiating equally in all direcvv 9ykvi9e( htii:6b8tions 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 unifm;ngxi)+rhuk6n 6u5 kc wj3 x;ormly distributed in all directions. What is the intensity level at xju+5;gx;36c r ik m) wn6knuha 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 dog23o v t)gctw43o0jewu . What would be the intensity level if two identical dogs very close to each other areov w)ttg4o33 j w0uec2 barking?

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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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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 i /eu32h vk zxunk)3iw7s 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 zi)x7v3u3e/2 kknw h uall 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 dista16(necru5(j ykj5 q dtnce will ity5(u5q ejc 1jd6 k(ntr 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 tonnxq w7s0,*glxmp6/*7sap j4lr i/kxee has a frequency of 1200 Hz. What is the frequency of the k 6g,i xe x7lrxa 74pwp/nm*lqs/0*sjfourth 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 900 Hz, uihhahou (,pw-+(ul. What is the length of th(,,ai ou uhpu(+h-wlhe 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 p 2u;oxe+gn * m+1e3aayunzly;ipe of length L is 400 Hz. What is the frequency of the lowest tone that will ;m2*e+1eany+x ouaz g n3l;uyresonate 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 anxgziabk1is7i-k 8h6 bg: ;4tt both ends has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the sehkii bnk4t;iz 1g-g67 as :b8xcond 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 isi 69m.lkqif+b97wvp 5 gqd syt*.2x pk in a room where 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 infg fmu- 9ro9l: a pipe closed at one end is 330 Hz. What is the frequency of the third harmonrof-fgu l9 m:9ic?

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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 will have a fums1k;x2 oea2m ndamental frequency of 60 Hz on a day when the velocity of sound ioakms22 ;xm e1s 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 wherg aadfzg5 5 do/m,p3xb updn-.;o x4,me 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 where the temwsf(iyao.mhvwi-;* g; 65obk perature 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 pl7rsa*5sf e.uh ayed when the speed of sound in air is 340 m/s. What isf 5are*.7uhs s 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 oz 9ric0x/zv*:ffzu :h f the same length: one is open and the other is closed on one end. If the fundzru / xfi9:zzhc0 :f*vamental 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 frequency of 800 Hz inrv3q/ dq(x( nh (gga6* hqq0yn air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moveq/x 0 3q(g*a ryqqh6dnnv( gh(d 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 driven by the same frequency of 5004h*u 6woc*qs :1 *a vr5tofmqf 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 tosq wq4 u1fav*r*c :6ofh* o5tm 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 frequencicqw3chs c2/, les of 440 Hz and 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-Hzbdmp bg, lknd7h1 a950 tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency 7mbk pb0alndg5d9,h1 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 byfmx6vv i p4mu,k*6 (le 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 of sound is 340 m/mvfle,p(66k4*uv m x is?

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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 ornxg rfp*7+v8 schestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in s+r f7xv p8ng*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 lqyp::,2 v.h fozy o n9vy)ac-source at twice the speed of sound. The observer hears a freqlv.2vyo y,-:o)ncz a:phfy9quency 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 mazyo e.972os of 1000 Hz) approaches a stationary observer at one-half the speed of aez 9 s27oo.mysound. 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 lists:*q vf 2xx,o02ycwls ener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? x02ssvq,c*2yl :fwxo (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 at 18 hsu fr5lut,35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roa1su ftrh58l u,dside. 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 aw,m jcj0/+qj.wluu olj* 3-8t dk .znzpproaches with a speed of 30 0codzzn j ukl*t u-jm,w /q+j3wj.l8 .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 a( fmm kth,3voj- ofjr74yh 2/gt 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What f v47r2 fjy /(o j3m,kthmo-ghfrequency 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 train. bq, 9urap4w igy89r4c The train blows its 400-Hz whistle. Take the speed of sound 94pq g8yb9warcriu4 ,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 yo(lo4tsu *f2 ((yz zfullt)h a2u at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to 4l 2a(ot*yhl )f(( slzufz2tu 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 120 k6(gtku,s nxs-*wy.y qh 4 r2pqm/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of yuh sqsyrng(2 -6kqx , *w4.tpsound 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 trsfrfy4 3p *,vm(n n/*tb5fgafain horn 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 i5,pfb(*3f gvn a/yr*nf4mt sfs 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,5gzc; gil+ch llx a3a0g((f w of sound in air is 340 m/s. What is the frequency heard by an observer if the observer i3a wfgx,0l 5z;(g g(ilclh+cas 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 signal is sentc5kwrjjrsvfviicst h 2c lj* 7ea(o1,33 3j, 4 out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. H rjve53,wj as c2r3oscijj1*f, 7tk(h3ci4 vlow 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 thehy7b0x.e.zgne: +7 va5xj hkp 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-anaunxk6x4rf 5wcc(2n 7gle of the conical shock wave form7ucr 56xnkx4 (c2nawf ed?

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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 a Mach nu9s nne a8c2 vryu,3r6tmber of 1.05 where tn83vre2rc y69s au,nthe air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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