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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 fcsia ndan;+98alse statement?

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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 fawo w0- nme -ii 5 ;t8 kxcwii*ia9nj/u5f0a2aostest 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 so aieq,l v;wb0/und in 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 increaw acxh5+gx/w75e.rt hses, what happens to the velocity of sound? (Assume that all 5 x7.xeht/+hwcrwg a5 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 400mn)u.aj9) *ulcjn7m-+cjg j o4a((eutj* xgx Hz sound, the velocity of a 200 Hz sound through air is9 a+x)o7ncl ajc ge*(u()jn*gxujmjj.4m- tu

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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 waveleng*zdt*bsu: ,x,p shu .a2xr qe7th of a 200 Hz sound in *dq,xuursaz *b.pt2hse 7 x,: 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 with1wfr7)u h1tmd (*dyn +w-iwbg frequencies 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 20 Hz t t9yj8 k8ka:nalcs;5c tulhu ,rs 0(-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 directionsk wzqoqpe8) -j /pdf14. If you movke pqp )4 z8-/qjfwdo1e to 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, intensity is pcgp4of1lt 9hml e b776roportional 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 sou8ipup6 m 4:n*bh.l ppi(oirj 3c6oi;hrce is I. What is the intensi.o4i ;o p8m6hric6h*ui l ni(pp p:bj3ty at a 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 sok64yngsomu w)o c/u6n1 a/ lm7und source that is radiating equally in all dirw647o1 ck6y ugmmal sn)/ no/uections. 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 a sound source that is radi igrs jv u4sx3 f4rmbl:yv,.r*s:9bx2 ating equally in all directions. What happens to the intensity level of the sound? It d:ms2yv .9fj 3vr:urgx*bxbs4r ,l si4rops 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 sountwosd )7)j v0qd 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 characb.xx7m3/ x ;j4jbiaj vteristic of the soun xbjj;4i mjxx.7/bav3 d 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 musioz7c ; f:bgc,wagr qepcn/ enp mm ,2:(7ny(r0cal 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 notutl(/x hrpo: *6c1.nqcf:lu w e?

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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 ihx 9mf vn)d) v25:wn mt i4wnn24iix1into 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 wave ih4oqk3asr1f6)c 6uu s 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 wa +oy,j0cf,9z l n bmva.g)y*dbve generated by the guitar m.d)j l0,*yvyfb+gczano,9 b as a result 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 both edml.jkw9rhg bc 3)h2 /nds, 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 a.9v(yrag3mxi.rug(t cgs x9 1re the wavelengths of the three lowest tone9 y . x irxa(g(g31muvsrgtc.9s produced 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 length L is 200 2 snh 0ox b2wp)yn*1yzHz. Which one of the following frequencies will nox*ybn2 sn yw0zh2op1)t 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. Whi;p3q0y eh0w pcch stateme;heqc00p 3 wypnt is 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 the o6 wt xn3zia90kyk/0blther, 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. Whao1 9n;iy, ldkg4vx zx-t are the wavelengths of the three lowest tones produced xznvx do49lk 1iy, g-;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 cba3 yfsm+3tv).8 uhes losed pipe of length L is 200 Hz. Which of the following fre )uesyhav83bs t+3. fmquencies 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 resonating at its iwqyb3o5t mu.6yg ;a 0 fxsz+6fundamental frequency. Whic5qi ; +.xwyo t3b6y6ms azfgu0h 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 speaker9j t:u yyx.qa,b.* bjg-t/ sqbs driven by the same source. Each speaker produces a tone with a frequency of 200x. j b:t/.tbqg*jq,abus 9yy- 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 souzci** i/-b60ofes8p25 xqxs4pmc r uund 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 nk*fi,a:k8rnak () i fbeat frequency is heard. What happens to the beat frequency if the frequnfk *ri:(n,a k8ik )afency 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 explai/ - vw.71dlec)kvb( ciwhs- dfns

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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 frequency heard by the;dw .l-4hxdj u observw .d4u -lx;hdjer 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 stat: 5g( jvh.xgacionary observer. The frequency heard by the obserc a g:5vh(.xjgver 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-adhvy, m q 9 d /k:bzuk3fcl0z01bn+2tkngle will decrease by a factor of: mlc b0,/ y nuk9v3k2k dqd1bh+fz0z:t

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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 kHz in air is 352 mutpa;nv 4,)au9)6 i-spf bruo/s. What is taun)u ; rs upafoib tp6,-4v9)he 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 speed of sound in0q (94w xrwpjr 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 em sr1it ich)b kyp9o7.cj 0i-u6its a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected9yr0 7ps6.k ituij-oh1c cib) 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 i v )y2ubrjji9,8bbvqvqj*g3(i.j45f5jo uf k s $0 \; ^{\circ}C$. 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 lightni+ ,ay-c83i tapbvfz /kng, the distance to the lightni/a8f,kpcy t+ va-3b izng 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 +s)qpkolrylx 98m2+ma cliff 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 m. nss2qge a4x/gq1s+a deep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume2g qsna.4/xqms+g es1 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 f a;h4v4lu-ix uimh2fm4 .k3ylrequency 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 aisgi/ruf 7q 2dks0v077t na7ydeod89 zr 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 intemn i++ ,;pnnbxnsity $10^{-3} \; W/m^{2}$?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensittzb k8 d6(avpvx)l4e/ y 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 inten1s,v5f gkomcq t ca ;fv8(aft ss69-u)sities of two sounds with intensity levels of 70 dB and 40 dB? akv su6mq8,fco t-59tfa fgv ss(;1)c

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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. What /q1)b.3i2r*tl bif; hm xf xkhis the intensity level generatif xqfb3)r* t 2l/;hbx1i.km hed 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 distanc ; sjcpipr 9y,o8eq,+xe of 6.0 m from a source that is radiating equally in all directier ;y9+i, c xpp,8joqsons 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 equally8qo6 (/ pzolsh a;ly1s in all 6q zl(asol81ys/hp;o directions 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 abou kc-w397zk r f 0(x1dwyl-pkiet 1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m fr 3x7i(9cy-lp zdkf-w1w0 k kerom 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 barkinms-fx0pb0y v 1g dog. What would syfxv p-01b m0be the intensity level 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 qlf8v+6 u n(i+7g;ec1dm r ,d: brtyazsource the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assu 8rdly+,1 fz i;+nuembv:cdqt6a g(7rme that the source radiates 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 levee*pup-qje 0 v-nb6wuv)gr37rl 5.0 m from a point source is 95 dB. At what distance will it bp--v)beu* 6 r7gnrepjv 03uwqe 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 1ty+m x6b)ps (7n,u -a4qrft uc200 Hz. What is the frequency out6 yqcm7f)u- n+4ra ,(stbpxf 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 txr gk.q dsil.)u,75loiuhm6 w+gc: k-hird harmonic of an open pipe is 900 Hz. What is the length of the pi is:xgdr+ ) lhq,o w5g6lcu7. km.i-kupe?

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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 i tjip9/8g(zbw n an open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of length i jzb pg8/wt9(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 velocit83/ zpvig ;dlp4iw8a my of sound in air is 340 m/s, what is the frequency of g;/zi8am id8pvw3pl4 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 temperatureyn ;v80h1 mzee 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 Hmzu9fz4xcu/) c 1 a/ztz. What is the frequency of thez1z/f / uxu)zamctc49 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 closed on one end that will have apzbm-*mw 79p l,f:dsgftp 50y fundamental frequency of 60 Hz on a day when:*7 gf-mp,pdw09m p fb5ysz lt 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 isq 3corf -rt ahea20,)o in a room 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 wheref+* gff 5ygo,s 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 th986 u)n9v-vh 1x:bwvs;fed i 7qtrgjk e speed of sound in air is -8vstq79f iverw;hv6 kd) gj9x1un :b340 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 a9pk yg ive g)6vkz1xl2w00(s xnd the other is closed on one end. If the fundamental frequency of the open vxs1gvx6w(g i 2lpz )0ey90 kkpipe 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 in air where the veloci* )gg6e q1yk x2ebw8auty of sound is 340 m/s. How much farther back would source 1 e61 *q) u2axbgwgy8e khave 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 by side and driven by the same frequency of 5an d7dm,5 j xupf6kg8300 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 dista7 pd,gamk63dj5uxn f 8nce 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 fg+y c fy1ag-fy v,f.bx. fmqcm05 vp7von0,4vrequency?

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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 h6 sld 38vyg5en6dq :bof a musical instrument. If the tuner hearn:3s5ey6 ddqlh bgv86s 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 horng*3jkp: 6 7plc.dsgior 55iqss are 6 m and 7 m respectively. What beat frequency is heard : 35il7os.p*6gqkip dcjg5rs 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 orchesn.wmi5(0xv7xxtc:hi tra are found to produce 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 would bring them to the same frequi( i:7hc wvmn.xx x05tency?

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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 soundtnk78(/y 6:2rrct+t:byaw z rl. jzbf source at twice the speed of sound. The obsen78:w( z t rt6br ay/:2y t.clzjrbk+frver 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 st uj/ ;dofo o;0qnav08aationary observer at one-half the speed of sound. The observer hears a frequency o0o8o;q j;vof nud/0 aaf

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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 lisu9wtte)ija rs; *gb);tener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The s;j *ga);wist )9 teurbound 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 smvqc5gb(eg 2/iren. 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 observer who is standin2 g qbcevg/5(mg 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 approaches wi6 ag8g kg0::thy5 mlapth a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound is 3408g yam5p tkl6gg0: :ha 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 400-Hz 62 j wp6.zosvjupp;)n whistle. Take the speed of sound to be 340 m/s6o6;p)j v.2zup npwjs . 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 train. The train blozy/ea )x.,gkgws its 400-Hz zk/e.g ,ax yg)whistle. 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 km/h. The train blows its 400-Hz wf16z-dj+ q fyvdwzw 3*hiszwv*1wfq6j d d+3fzy -tle. 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 120 km/h. It blows its whistle, andp w3r +,3cvp4djxk-oo you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What-xo j3p+o pw3cv4r ,dk 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 500fd * p;hv/n zqim+:eckp6n(sh5 6cy1c Hz. Assume the speed of sound in air is 340 m/s. What is the frequencycn6 c6 pdmq(:5s fyinh;1v/ k czhp*e+ heard 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 15us484,)ws *(dxo v jro afx 2c61dfnpzhzj rof sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speed r8j)of6z(prd1*nuzfs4a42h5 ov j x1wdsc,x 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 smc uqu6e mwnjpl0jp j:68b1-,ent out, and a 42-kHz signal is returned. Assume the speed of sound0-mmjlpp6w n 6 c u:,bqejj8u1 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 superqa*fya,h,o+*r:h(mdio w i 9xsonic 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-89ywr pb0 bplu8*vj7l n8lu0 uangle of the conical shock wave78vuynrpll 8w0pj 98*ulb bu0 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 th 0 0dqfwqs2v2a1d1 pfdbz8 xi;e United States to Europe with a Mach number of 1.05 qd;w1a21 b8qffs2dx0p v 0idz where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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