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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 faxk9h2/ow w 6mx/o rd+ rbzao-4lse 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 fastest t2 ci,jk j*w02r jfto,chrough

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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 ofuf3b. um0c;xl sound 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 increases, what ha n 8 ryl4htg5/d15,tvxvqf qw5zw( 5hbppens to the velocity of sound? (Assume that all other factors 8fwhgl1w n/qv5zttv(5 y 5 dbxh4rq5, 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 velocityq9 ;6jpb z3m,f 4lv y*hj4jcfzmz-+ vy of a 400 Hz sound, the velocity of a 200 Hz sound througl4, *4v3 hcybzm+zfq pzf;jmjv 9y-6 jh air 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 Hqj v0 j,;zaa:l hybf0em-p;/wz sound in af/yh-z;;epj wl:j,00qma b vair 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 frey 39x upwgu o3td*8g9equencies 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 are caq3* fuw,fo lppt +sg07lled

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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 emtm-5s e2sb w:eitting waves uniformly in all directions. If you move to a point twice as far away from the source, the frequency -s:m 2wsbet5eof 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 sa t//cbd m5cel3i4fq0w:4d 8cfkih4 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 atg a ;clv:9(p0gk7wuv blb ;sr,z t+c4b a distance d from the source is I. What is the intensity at a distance 2d ;+tw b7v clzbb:lp,gv4 sgca (r0uk;9from 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 f* zqmku*o x,4source that is radiating equally in all directions. What happens to the intensity of **, xmuk4zqofthe 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 radiatax2p ryarkr,vj-f8.9g (os/ping equally in all directions. What happens to the intensity level of tpj,y(av 9aro/r.8grp2xsf - khe 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 woqk xr9pqagu;5p)c++ r*o7qxhy14sincreases 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 emittezow v82,uy( 5cxwnzns.gu y1(pgc53ing a pure tone. What characteristic of the sound increzw ( xz. ewngsv 53 8o,yupn21gcc(5yuases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudnjg2).1smgx lk1v .j mcess" 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 "pitch" o*nk) co:cjab0xv nurm06 -he/f 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 wate w98bqm8l/ jzmct9ejp9 )n(agr

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wa( r7cqhb3lo b:ves 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 strikotn8x2yncr5f7k4 s bi9 zp99ng and the sound wave generated by the guitar as a result of this vibration. tkpb y8scf zknr29n479x9 5io 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, thegh bw j3)n/+eere

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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 theig58v rq /vg,o wavelengths of the three lowest t 8gv/o5rvgiq,ones 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 Hz. Which on6rdu1768kpx)c cstk ne of the following frequenckx1 pc8t)cdkusn6r 67ies 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 a/v edu*obe2t qd8ng0b),j;ruf2 bx4et its fundamental frequency. Which statement ifxb2 e 2v,uddqg)u/nb8 bteo4* ;rj e0s 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 *sugk,vw7hm/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 are the wavelengths of the.5ckkzdl)l+; ea mh- q three lowest tones przc- ) 5ekh;qkaldl+ m.oduced 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 p)joua7hd/le) , m l(gpipe of length L is 200 Hz. Which of the followig /daj(mp)lo 7lhe),ung 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 closed4o:6rtl /umns at one end is resonating at its fundamental frequency. Which statement is4lmnt:/us r6o 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 siq6y5vh vm*g 2peakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the sphymq2*6 vig5veed 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, 8c -(k tl.ewq u (1wyri*-m.gt/9 blttmqq)i tthe two sound 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 so*0s6*vimzvhn4 mb : yeunded together and a particular beat frequency is heard. What happens to the beat frequency if the freq0sbzvm 64vm e*ynh*i:uency 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 explxd)mve4 vr/k+ z/io4 a 3nhjs4ains

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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 ox;(a en+psq*j9n z2/pwjd1h ubserver. The frequency heard by the observer is/nhj q e * j(pdwx1nu9;pz+a2s

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source depart0 *kqnu)ysuu( s from a stationary observer. The frequency heard by the observer isknu(s* u0u qy)

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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 decrease by a ed8)l(kt7 u .nnw a1rm,tk8q yfactortau y 18 d.en qk7(n8w,rtl)mk 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 kHz i)b1t u;ujpd;bbpbar5+c *m f8 n air is 352 m/s. What is the ;* r apc b)8tm5bpdb;u+buf j1air 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 in 29x o(( ry4 1sgpxh;uc(klwtsair 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 u 0zu l;+b5t z.zhw*9x nrso9rair is 340 m/s, a bat emits a shriek whose echo reaches it 0.zr+ bwu s9zu0r5z*on9l h. x;t0250 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.8cr;hgb .b/ y1yidr/4b l,ori*emeue04 ji(h 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 lightning, the distance to thn,8fjt4fo*bnn n1f8 caet .+ de lightning8ndttj . *f+8n4n,fn b 1caeof 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 aytkq+- 1vz wy((j ;tli 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 a deep well and hear the splash 2.5 s la)1e l y u+g mnnxkmgn+u:k7*m.8ohnv6ter. How deep is the well? (Ignore air resistance, and assume the velocity of sounkk7ne8x. 6h:v)1lu*m+gnmum + nogy nd 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 sounqi;y*fi3e f- xd 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 aitsyky1 )ta)k/j zr )w4i xr33p5h+ sfzr 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 leog) qmwmj: 8y9hv6 8.vrch t3jvel of a 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 of :n r3d fg0 /xsfgjobxj0df+t(o8c0 *u 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 withfm2+ n((fch i* +eurpu intensity levels of 70 dB and +pnhurcm(f (*fiu e+2 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 1aaz6/rswhgvi-x-g 2h g i,9w 6b53tom00 dB. What is the intensity lera ahgv2w -, b9iht 3ogx-6m igz6w5/svel 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 radiati -dlu .n2db e.epgm35l,fr )xing equally in all dirid)3 2.xn.bud pmer5,llf -egections 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 source6 gjmo q1cnp3in0598d woye)e that is radiating equally in all directions ip 9en6ogy30 oc1nw)58jdim eqs
$6.0 \times 10^{-10} \; W/m^{2}$. 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:; uaxl-(d t/czam7 ei uniformly distr;7m/al- cztdaue(i x: ibuted in all directions. 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 )yxb4k6; f3lyyjjb ns 7 6:xmpbarking dog. What would be the intensity level if two identical dogs very close to each other are barking? x:6 xml;6j bjf3sypyy )4kb7n

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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 intensitc.hjzx k4az5c,k1* kqy level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that thzx k*c1ca5 k qh,4.zjke 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 level 5.0 m from a point source is 95 dB. At what d tnxx3 ;t9t7jdistance wxnxj 39 td7tt;ill 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 fjz+,yb l6 c7i.la9y lurequency of 1200 Hz. What is the frequency of the fourth harbj96c a +,yllyi.l 7uzmonic?

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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 pipmto7+yyqjc.hug*kj8 q z.;. -xqvc.a e is 900 Hz. What is the length of the pipe cch.+og.yyx;.z*ajt umq q-87jvk . q?

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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 Hz. What isflmajm.+dx 1qq,6ct (lshwsa l . 7j7- the frequency of the lowest tone that will resonatet f7 (qlcah +qxwm-dl1,6s.a .lsmjj 7 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 a,gtt , ,2ka.p;*7fyarlc) mrbuf7 pjbt 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 tham7t 2u;jlr*tff, .7bpr,ap ,ykgcb) e 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 temper 8g,owhldak*r /94w52 d fjpmlature 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 ex /ok/dx0j z5q/wek3at one end is 330 Hz. What is the frequency of tqk x/jk5e /z3w/xo0ed 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 clz +j6(z + isk.6mwkqetosed on one end that will have a fundamentaliqz ktsme.jw66+k (z+ frequency of 60 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 temperav +ubs*erjo0ym9 -3e 8 z)ponnture 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 v4z1a3jm+ ubz room 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 s )pxn6 f y02isane9kd*peed of sound in air is 340 m/s. What is the fundam)p0sk 6aifed*n9x 2ynental 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 an8g8vx.su).dli(f rr xd the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of the closed pipe?rvxs(8 8xf.)g irul d.

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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 8;-f w *olipohxj,x*iin air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in f 8o i*-l ;ixxh*jwpof,ront 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 500 Hz.+ xy3;re)6e:zijl7g dxw0r we 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 t ex:;7 w0ejxyl6 i)ed rwrgz3+he 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. tdz1/vlr adj;,pl / d1What 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-Hzf k5m v2j1fqeo7,,0 sp. twphl tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the insfqwp spv,2l.ho5 e t,0j1k7fmtrument?

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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 produc 46jw +bmi, t03 n/fuq-eagqwked by 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 of46 i0ftk3wqa -ueqbn/g w+j,m 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 found9yy46 iu01f ajg8yumx to produce a beat frequency of 2 Hz when a frequency of 660 9ug f 1axmyi4uy8j6y0Hz 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 sours(u. )rtm -flp2vk)j q)sg 6zwce at twice the speed of sound. (2z6f)gkj lsm. p u rvtq)w-s) The observer 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) approachesygvzv(* + zzv(/bng+d fc)g/v ghx+e* a stationary observer at one-half the speed of sound. The o* d *g/zy+ gv+ecv )vv(zxhgfb/+(n zgbserver 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 mpvj 3rj,o(mw9*9ku o Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (Thepo9jjromw ku9( ,m*3v 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 35 m/s on a day whxy-wz 8aajv1* 6 m;xw1 zqnq+een the speed of sound through air+-jz1 w 6*vexzwqn x8qm1yaa ; is 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 frequency heard by a stationary observer when a train approaches gojj.-jle i8502ir h twith a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of soun2jti-hj r eojgli8.50d 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 traiuo knof)9,xs ct.-ul 8n blows its 400-Hz whistle. Take the speed of sound to k tc,o9 sxfnu)- .u8olbe 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 train. The train blow71- v .x2kmsnpn rdey5qr) v,bs its 400-Hz whimx d.-7nnv )pv1 r2 r5ye,sbkqstle. 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 atuq2i7 (9jy xsx 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to by7xxqs i(9u j2e 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 blow5 :bydf1 )wdyis its whistle, and you hear a tone of 400 Hz. f y):wdy1ibd5 Take 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 h/;svkbpwy b wp;v; 2k4orn 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 mosk;kbpvy;w4/2;vw p bving 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 sound g060cxcn5j xd in air is 340 m/s. What is the frequency heard by an observ6xgc05 xcj0 dner if the observer is 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 shv.5h aq8uv*o* -vtm ywi1f 8eignal is sent out, and a 42-kHz signal is returned. Assuo wf vyhmv.ia1* e8tqh58 *u-vme 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 shou h c-3hn-2krnck 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 spee*a8ezv u;p a7k48dqjsd of Mach 1.4. What is the half-angle of the conical shock wave fo4 uza*878;v q sekajpdrmed?

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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 xvloem0p ewp/b al(/ss507(l a Mach number o5 o(ll0v/a(/pss bxe lem7w0 pf 1.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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