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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 statr6rv 3afe+pg .ement?

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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 hf ye0xo( e,+xiypn 3am: /n/tfastest 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 *v3.0ooucupl,8e i1vf nf0io 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 v fc(oo)/wd :uzt fxjnsv1+ b(ywa **8dz+ tek2elocity of sound? (Assume that all other factors remain constant.)bvnj82y *daf) :td (1k xw+uo/s fze(owc *z+t

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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 a 200 Hz sound thz/s z8rw jj4w.rough airw zj s4zw./jr8 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 2001-key(i dw-nc;3o b gu Hz sound in air- iy;-gu3b1wc(o kned 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 gre;e.5z2.f dwbv;nm lhpater 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 frl* jyf 4jl;*jyequency 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 emittjeza5+f) +f xuing waves uniformly in all directions. If you move to a point twice as far away from the source, the frfjx e5 f)au++zequency 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, imx -ap ev 94+lhl7 yyiby8 h)mx)pnra4*ja;y.ntensity 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 poco gxunojc..kn+.8x8u,g i3e int source at a distance d from the source is I. What is th8cx.n .xncgje8uog+ioku ,3 .e intensity 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 5 h1 ej.+(,mcwwgixt nfrom a sound source that is radiating equally in all directions. What happens to the intensity x+ . cw15ijmh,ew ngt(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 soudr + y61gyrc 0(jwrxe(3h je5rrce that is radiating equally in all dire r drrejg(c3y+ 05hy6(jx1wrections. 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 louderu 5 kgxr)j,rn7d6f:g c?

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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 dlt abz84(.tdcharacteristic of the sound incr dab(l t.48dtzeases?

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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 musical notes7/5rb-vn 2 hryay- ap?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the "pittt;om,70 d ((mpzezr 0a )ywzjch" 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 waterdbmn; ; ej-m/t

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacementim ivanp7,z/i0 u4h 5y waves 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 thc.kt)k.h o,iv28a ucre sound wave generated by the guitar as a result of this vih)ck oi2,r.vck8 u. tabration. 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 whiv65c;gyhep-ehh; cw9 ch 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 bdv uju9;/og/are the wavelengths of the three lowest tones produced by thi;/g9ubuv o/d js 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 o 4b vpvczwvz 1lakndx8+()h3(ne of the follz +kpbv )vz(3va1 (hx4wnld c8owing 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 resonating at its fundamental frequency. Which s(7gbowi4yum 4jlf)a/b r qb ; +(yhxn.tatement is correct?m7yf+h4 l nbx .)bb(qy(; wuj/a4o rgi

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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 tn(qb.w uf km;g) lr;wg2d08oy4*wnnkhe 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 l-yt(1tm6ohfu ength L. What are the wavelengths of the three lowest tones produced by this pi16oy( mtuth -fpe?

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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 Hz.,mk5(a 2j jl mix.-edf Which of the following frequencies will not resonate i-fkda,m2j5 . ixl( ejmn 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 onlqr 28suiiw7k f6g 5(s9vkp6ae end is resonating at its fundamental frequency. Which statemens7wkskli29 r6v ( q puiaf8g56t 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 sapk)y sls--tc/ev0 k r;me source. Each speaker produces a tone with avtpk/)k--yc 0lse sr; 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 w z kdt)jr76w/rwu1xb /3gsz5aaves 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 beat frequency is hearejnpf vv;;c.v4) k8: e .+i ffiw1jxubd. What happens to the beat frequency if the frequency of one of the tones is incrb.j+wup 1 ;.vv f; fice)8:evixkn fj4eased?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift expl)k :c/7idmkp9c(/kd gbsi1 glains

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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 frequencybp-tai70b: k.n fu n6c heard by the observer ii0f a.-c:p6tnunbk 7 bs

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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 he jae6:)b pjiu+ard by the observer isj upi j+ab:6)e

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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 mt)vg6w9) fc7pc lv*j3 er5m ahalf-angle will decrease by a facp 9r)fc l6*a5)w7jvgm3vt cme tor 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 kHzpmvh6bcv 0;*k 4k o3/xiu8jby in air is 352 m/s. What is the air temperature? 3* yx/0;bc mpk ukvihvjo468b

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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 so*d.i bt,1jkq rund 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 em 6ia:x)av;eq;j qwua8its a shriek whose echo reaches it 0.0250 s later. How far away was the object that reaa;w: 6; q)vjeauix q8flected 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 eu,glof7 drj) bb v0+u.cho in 4.00 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 lightning, the(;s ,fu d moo4kr1vgjhk())gx3khb:ei; oxh 0 distance to the lightning strike iogxrhko0mxi d1;g ek osjb;hu)v:h3fk )(4(,s 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 temperatu +*hkk1lr-fkg+m8w xvilh6 50s 5sglq re 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 deexl)8i31s8q: x gpge2 qxtc*cr8f i8lsid d23up well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assirg d 1s3x 8ccu*8pdi8s8i2f :eqql)l gt3x2xume 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 50( fb p8tjck2ia;t-sq)0 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 air az8o22iity-n bt $23 \; ^{\circ}C$ 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 w71 bf:l+ h 3v1vrcsv8jnhsy./vxvi9 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 a 70-rg ocptb;ci;(3:zei4 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 ,r4vdk a(9( b2z -vdgd b0(odgm.vitnwith intensity levels of 70 dg mk.z d9ddg4a(vv-niro(vb b0 (2,tdB and 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 enginnz pzm gn6 d56(miva(* smj59zes in a garage is 100 dB. What is the intensity level generated by one engvn(*ji 66s gd(95mpz5amnmz zine?

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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 disuc59 +n9bz+l3n wskk9 sltks1 tance of 6.0 m from a source that is radiating equally in alw15 s 9s 9ctnulkksb+k+3z n9ll directions 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 radiatjsp/ g m(f v6h -.7 4osxfkaewgu5x2b2ing equally in all di5 2ksj ou bxpmfafvh(g7/2e6xs.w4 -grections 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 uniformly dg -(4mupc i:xzfgv( :qistributed in all direc(i-mf ::xq gcvgpz4(utions. 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 distanc q432z4t q7stqku) dyoa(4nsee 5.00 m from a barking dog. What would be the intensity lee ) qqq7szt(ko444unda 23tsyvel 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 source the intensity levelfq1jkb/ mh.h7 7u-kqc;3ul o t 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 dir q73f j; huk.qhc71/k-uboltmections.

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The sound intensity ltg e-, y;noew/wpc3l c xdc2q )z1g/r5evel 5.0 m from a point source is 95 dB. At what distance will it b)1g2yr oep;q- 3zcwg5t ,xcc/nw/eld e 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 comd 4a)xbv8p0 fyoo2cv8 plex tone has a frequency of 1200 Hz. What is the frequency of tpoo8x )c4yf8va2bv d0he 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 of an open pipe is 900 Hz.jm+(v my;qwc )*p:r.g8 bxn qy-(ujlg What is the lengt((gc:g-b)y jlqnxw yuq8m; .*rvm+ pjh of the 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 resonat/ ;zfu 9*b0wi4gaksy6q ipq:e e in an open pipe of length L is 400 Hz. What is the frequency of the lowest tone thiku es q; ga6iwbzfy/:*0 q49pat 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 length of 0.80 m. If the velocity of e1i dgahf4d3 j(gz*1n sound in air is 340 m/s, wh1 giz*j d dfea3nh14g(at 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 where 6pd*kw7pth f; 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 13qbri: hwq-u)1gr-f o9gx xx is 330 Hz. What is the frequency of the tfx wx3hq 1og:)- 1xuq9rg rbi-hird 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 shortesp,.f2vzldi 3k t pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound isvz,. ld3kfpi 2 340 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 if3j.6wy ;to 11 7 *zineukcqgks 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 where the zmj8akawy8 d q:5v*q 4temperature 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 in air isn 8b yxzd6/*s0 fs 7mavcax;;8nm+krp 340 m/s. What is the fundamentalxxsa bc m/z+8*0;dnrsm n k;6ypf8 av7 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 samk :s yijmaa:s+)+js/l e length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, wh:a+a/m: lsysj )+i jksat 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 velorzi,2 / lhojs)au:nocu(4 qfb *)rl1hcity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in front of the bc:4 uahj1 sr o/li*zr2h, u n))fqlo(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 i9 ax 66arxy1qb gu d*var05+qzthc0(500 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 to the other dirx ru+a qq 9v15yaa60t(0z*hcg b6xspeaker? (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 frequobt+ yf.:b9a:tca f ;tencies 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-Hz tuning f* cg;3 ibyu;uz4lkn*aork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of theubilu n*ycg;z3;a4 k* 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 proddfka:b+ zbyib1 ;4wn; uced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a daynbb +4a;;fi yw k1bd:z 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 strin62n ew2g bsuydq9)* qrp6px2xgs on two violins in an orchestra are found to produce a beat frequency of 2y n sgduqe2bp2wr692x )x *6pq 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 te8r *et0fv2a/pabqg +he speed of soun vf2bg+ a0*rqep/ eta8d. 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) approac3qyzkx1)nt2f 55rui v0dequ*q w.u*a hes a stationary observer at one-half the speed xdk.urn)2iaq1* 3fyzvquuqt 50e* w5 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 moves with a speer7;ple-r k :.citn ey0d of 30 m/s away from the source, what is the frequency heard by thp.lrr:i0k7- tce ;en ye 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 at 3ej s(/rn g5g ym6/1rsx5 m/s on a day when the speed of sound t51xs r6egs/ /mjgy( nrhrough air 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 stationajv/9jol(8:4 mex fxgkry observer when a train approaches with a speed of 30 m/s. The frequenm j lfv4je8 (ko/:x9gxcy 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 at 120 km/h. The train blows its 400-Hz whis rd i 4ahinzl;7 lrnr(c f44v) /s.-za1tqrtx7tle. Take the speed of sound to be 340 m/s. What frequency do you r47 zcdilaaqrl; 4()nt14sin. /xftvrr- z7h 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 c -* am9q3nmtrtoward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What m-* nr39a tcmqfrequency 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 tr:nrf2wd;eqi v*n q 93kb y6cc5uy;b u.ain blows its 400-Hz whistln;. ;qb: kv *3dy5e6c2niu 9yqwbur fce. 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 kg:8qq7qo 3;iz4t mymlm/h. It blows its whistle, and you hear a tone oftq:7ygzl 4oq 3;m8mqi 400 Hz. 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 horn is 500 m5 7a z.nmh ictjs+ghp7t)j-2Hz. 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 fr-2pm+5) h7a 7hgz ct.ijmjnstom 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 sounuk4h5p -h0la vd in air is 340 m/s. What is 0khu-l5pah4v the frequency heard by an observer 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 objlq 1f7)cr1 rzes 0 x8cf)wzvd4ect. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Ass0lf crf18wxc7sdr14 ve )z) qzume 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 coniqg(l9)b9xwyj 1 gqnz( cal 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 conical sh2nubdlg* 2 )9f+g riucu 3ept1lsi5l6+kcv*bock wav )uls2l+ *gg*ni9ukbrpve+ 5bdulc1t3i f2 6c e 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 United States to Europe with a Mach number opdn2/ pv6b0f sf 1.05 where the air temper62ps pv0bndf/ ature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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