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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://autodiscover.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://autodiscover.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 jx6)r)sw 0uj na false 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 conduq65 ga7z mbuj2cted 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 sou (*hmq/z4nt n:g;svihnd 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 happens to the velocity of sounx8 ;:m rkvx3xdd? (Asvm rd:x8xxk;3sume that 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 Hz ,, 4hxqnzyi5msound, the velocity of a 200 Hz sound through ,xh5i y q4m,nzair 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 Hz soun 8:*d5qftk j;l rw/l,5zy nqzzyf70xod in airdz t/ wl8*rqzky557;onqzf0jl x y:,f 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 f**vleevn*r je* tu07;spps* grequencies 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 ld s1 nno)c4w y1ew)d;kess 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 uni /kyp*m ovqe,t( /f:tfformly in all directions. If you move to a point twice as far away from the source, the frequency of t/etfy :f,p(k/ tmv qo*he 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 1 mnodm0 48cr/- i ;lk, gtwt8h6tzsstis 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 7c;cdv;cr n)m distance d from the source is I. What is the intensity at a distance 2d from v7rcn;m ;c)d cthe 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 ffy+ d 6mo23dlcrom a sound source that is radiating equally in all directions. What happens to the intensity 2co6yddfl+3 m 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 so 3hfi0b7 lglv;und source that is radiating equally in all directions. What happens to the int 0fh3gibl7;vl ensity 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 souwy 8n0o2 b lgw8pe4ha)nd 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 ton0e3vsse aja1 jvd*i ,rww2+k3 e. What characteristic of the sound increas,v 1d3a ie kjsj3s2re*+ww a0ves?

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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 bu.u b)o70g.5mriw+ difga0 h 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" of a musicajd + y)sh31vv 0kutx ef6tpa41l 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 int5uf.pxi0ws o.o 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 waves at6sk6 qqt k)lkr / w7jzxu;h32re

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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 onqlrkc 7:0wdnn/qw24 g a guitar string and the sound wave generated by the guitar as a result of this vibration. What do these two0w4q7/crlq2gn:d nw k 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 gdk)o/xu2urbywp2p695 c9 snddp,(p 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 wave4-8ivqsf c mv5dt tra9 f(xk1.lengths of the three lowest tones prmv 4vc9qik 1fd-8xtta .5(sr foduced 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 ony wt03s*1gq nxe of the following frequencies will not resonate in the same p0wy sx*1g3ntq ipe?

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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 u,cfhau*sx7y 5bc6 l-fundamental frequency. Which statement is correctbu ash -x,57uyclf*6c?

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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 closexpw y qojat-;cgn:4.(d 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 three low8yoyj;; qh (woest tones produced by t8oy;h(; jyqwohis 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 lengtht53r .7afebkqzg g,4se s.-jj L is 200 Hz. Which of the following frequencies will not resonate in that pip-zet e7g3aq.g k ssr4jfb j,.5e?

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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 fundamental frequencyogox ve+30m6r. Which statement is com3v0eor ox6+grrect?

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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 two8f 33*sj k0jht53 7x orbpowdc speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of s7r hxc3dktjjw83opf0 *3b s 5oound 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 tbe /qlm 2f-o8zh:r-d + .ycoa, ai9mtzwo 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 sounded tc 0:p *ilufy1*aqifti weo0 i1f59 cw,ogether and a particular beat frequency is heard. What happens to*fiupyo *0l 0iwfec1:9qw 5i a1t,c if the 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 exvp3us,hm+f cm 9e1 tl*6hnj*tplains

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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 ynt 9 4sjt3.xq13qj qkobserver. The frequency heard by the obser9qqk x4t j.s31jn yt3qver 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 stathhpkx xto+ 78k.rv hudg:a70g6.-tb cionary observer. The frequency heard by the observe dg:rg7-hp o+.8 v607.bxtkkatxh cuh r 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 dox0 r d;irom12euble its MACH-speed, its half-angle will decrease by a factor ofoxe ;0rdir12m :

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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 fre1wt9ecchpf 2;v z/pl20zhm1 yquency 45 kHz in air is 352 m/s. What is whv1c t e9201c z;zp 2hyfp/mlthe 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 soulc cbl89rmg*4ko 8 l(and 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 34v 3p7ey 9t2u,0l/y effkx*pcs0 m/s, a bat emits a shriek whose echo r f*s 7cxl 2etkef,ypu p/y9v30eaches 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. i erfykcsc q*2;4 /l4k 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 distancepnr9 2gdjlw f), -/b sa9g1fwi to the lightning strike is aboi, r gwd-1apf99f2sw)nlb/g jut

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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 fmv(z7wt 8/f+ dxl 3yz;huq5ffrom a 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 c+0mt7; jf1g enyty8cand hear the splash 2.5 s later. How deep is the well? (Ignore aireyt 7g 1+8m;nf0tcjcy 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 Hz x1w4uv2 1m xca7gid+ ois

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound traveling in a-*evi:(agd)zi 81nj s 1 irns+br 58yigcgfq.ir 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 intensitm0mwr3td+jg p-ps dgxs5b/q61us/)b y $10^{-3} \; W/m^{2}$?

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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 tmyff7 rge /+ 1;z8jwsa 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 a 60 j(ytb;tzpwith intensity levels of 70 dB and 4t(ap6 zbjt0y; 0 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. What is the inten8j zju8b(+qsd2 v6a tedlcw.-sity level gece aj.u (8vqbzldd28tw6s-j+ nerated 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 radiating equally i:58 mphue;p;byj4obtn alleb :p;u8 j54bopmht y; 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 sourc7 pdht20hr-q ke that is radiating equally in h th27-p rd0kqall 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 about 1 mW of power, which is assumed to be uniforml l/fgpl)rs,u8z8vz n5 y distributed in all direcvl8gs,zfn 5z up)r/l8 tions. 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 xe8zjqi.tw,e sk/ybtu;,ucw2g*+8 nbarking dog. What would be the intensity level if two identical dog*xw+/e yi8,c g;,2tj w.zs ueknqut8b s 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 5t)f5:e z(m3b .cmpyqthvqt9 6ks db :the intensity level is 60 dB. What is the intensity level (in dB) at a poi3 bbcy 9sk6zet:q:h)d5v5. tmtqmf (pnt 2.0 m from the source? Assume 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 levectob z .4rgddu5 ;v8zf6 kj2s+l 5.0 m from a point source is 95 dB. At what distance will it be 75 d6c ;.+f8 dkgbj o4t2ds5ruz zvB?

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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 qcw6-lt 6v 0cffrequency of 1200 Hz. What is the frequency of the fourth harmonic?6l cqcw6-tvf0

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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 thir ) r 8s;h9zbceb3+rrttcm8b u7 u2ud3dd harmonic of an open pipe is 900 Hz. What is the length of the pipet bs8zuut3+eh2d u b;3c98cr7brd m)r?

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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*9 vi9. bn, or*xfq32u8ke1sd xcjou o 400 Hz. What is the frequency of the lowest tone that will resonate in an ope b12u *vdoj,8 ir.c fo9xqk*e9nsxu 3on 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 velocitj*6 ;9js+cghvw ca 1evy of sound in air wvh j +s19g cve*j;6acis 340 m/s, 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 rok s +4i1+z0d ctl4i *kx-wzmaeom 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 in au(ycd22zz*m*tdq ( wm pipe closed at one end is 330 Hz. What is the freque2(zdc dqy*zwm2 tum*(ncy of 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 pipe closed on one end that w-ba7(eaq /rx1td *zvzill have a fundamental frequency of 60 Hz on a day when the vel de*zx -tzrava17/b( qocity 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 temperature qn id5yk 6s9tc53nonx-g1 g(n pea 4*wis $20 \; ^{\circ}C$. 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 t,t3 qyfekw1/v5nn4 / xhsx fn:emperature 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 inpbd,*/4wg7i jh fh 2zj air is 340 gph/b hfi47,jz jw 2d*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 o :cz5 ;ietx0ezapv*7(oxit m3pen and the other is closed on one7a*o:3 0it5 t ;zm vxip(ecezx end. If the fundamental 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 in air kn yao 66j7 iavuay)ny*a4t h79i/zf+where the velocity of sound is 340 m/s. How much faruy 4tzof n)+6hkyiay iva6 7j7na/*9ather back would source 1 have 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 s +hu1s6)jnf51hyy oszzd jh(;ide by side and driven by the same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person detects little or no6n1)yd ;j5s+ ohuf sz1jh zyh( 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 Hzd + a y212eh+kyht0/pbuvst 6t. 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 fork to tune the frequency of a mus7) vf9zy:u0( xnl11uab eh*n xxnz2mk ical instrument. If the tuner hex91zeuubayl zfm07kn n:)nx* 1x v (h2ars 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 aregex 8s3xq2q hn: gb7(i 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day wh(xg3b27 g: iqn8qexhs en 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 twope6x/t1g +2vx l -qltr violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What pe e/2-x+ pr6ltgq1lvtx rcentage 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 the speedzbal0:skcgj;np2u 8+4 s db:g of sound. The observer hears a frequency j2s:an z:pbk;c480 glb+sgdu 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 (normvhvlt -bl2-r-2dih(f8e n c2cal frequency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer vctih 2-vrbc-h-e(2l2 8fn ldhears 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 spel) fi3qb+9o)au2nejfqc6 x )yed of 30 m/s away f3un6 o2ye)c jq)f+x)a9 fbli qrom the source, 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 siren. It is traveling4qvp,/bo)3 5rppwat d at 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes3vtrpb4)a,qp o/wp5 d 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 aheo e )ep+tf9d ;a4bl 2ali9z:p fc4,e train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the zol2 et)cbeda9 +,plfp;49eh ae :fi4speed 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 1)bdz glveah*5(,9 x qs20 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 hx5* e)(zqd,ab9vgs l 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 blows i8o,(t5bdvsv)z 9mj j lts 400-Hz whistle. Take the speed of sound to be )djobt8v( svzml59,j340 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 itjr9cmn .jvo,j21(b v c/iovw5s 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do1ov59 .r,(nmvbi/ o jj cv2jwc 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 f7f+gu f/ a.nx yn h)3enkc4zko0ao/(j 0xszd;rom you at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. x0znh /kceaxf(s;k.gj)/0n duoa7 z4+ no y3 fWhat 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 Hz. Assume the speed of sound in air p ofl cnieu0-2f92tm) 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.n- )2c lfi0fo2peum t90 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 tub/3w fh m4,0..vy oxurn)pkf he speed of sound in air is 340 m/s. What is the frequency heard by an obb.hf04r yuw,/x.vof )k3mn puserver 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 tglcf :/2aw fu -6otc-jhe speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned:wuf6jg2/tcf - oc-l a. Assume 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 superso0)ulk: , u3.dd*yqfuv zqs*jfnic 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 shock + 0fnjrag+-f: xr0aj+ 0dq ngtwa+a: dfxrfga+g n+-t0 r0j 0njqve 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 U2+7c ts1vjh( ohk) evh/ zoqx)tqz2x8nited States to Europe with a Mach number of 1.05 where the air temperaturvh8 t hxqh)1o q2v2+o)ks7jct ex/z(ze is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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