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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 (;2h pec: (*wuj) q0enwkh on78vrowestatement?

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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 fastestp5w x+(md y6 ai3mohk6 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 xjm,3 pjz k xpalr411h1+e5 edin 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 tv1n1hj( r f)yzhe velocity of sound? (As1fz)rv jhyn (1sume 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 sound, the velocity of a vyldgy61 b l:y2 r,*q g)/hfoq200 Hz sound through air is)g2ldgf bl1/y yq*v:rhq,6y o

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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 49)x,heedl y v3i8xx eHz sound in air is)i e3ve9,yd8hexlx 4 x

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequencti4a 7 knhfikpy; ) bpd:8l:gar,p9- cies 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 callng037ptg zp0p+ 3d jdwk 1xg9xa9*8wtj0qt ht ed

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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- q1 hp6nywo(h uniformly in all directions. If you move to a point twice as far away from the source, the frequency -(qy h 6n1pwohof 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 iseycf4kf w0q/ , 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 distance d from the source is Iv4xv-sny r6 (d- vpbrfq x74(icw gm15. What is tv 4c-iwpmsfqrb((rd x4nv1y g56v-7xhe 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 from a sound source that is radiating equal.h6x2.ifj xssvxdm4/g: ie0j ly in all directions. What happens to the intensity of the s/vd .x2hg.i0 j4 :isxsx6mjfeound? 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 kc9djeg6ubrz r57a6 9that is radiating equally in all directions. What happens to the intensity level od e9a66k9b ru 5zrcj7gf 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 lo (u a:ea:8:n+-ox rtc3s jj+tmyqvgo9uder?

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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 characteri 1r2.rfnw.y . fr1wbyuwgj4d 6stic of the sobdfrru jw wg1 r.21y46..y wfnund 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 aa;*jxs y s5+nn 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 musicaldwv(u0k ft ;fglt c:9; 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 aiho u/nk b6*f;cr into 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 wavlk 4s0 .wlz.cues 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 wavl9f v0h)0tc voe generated by the guitar as a result of this vibration. What do these two waves havehvo0cvt)0f9l 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, the.k aipl7jefjbn- .(.hre

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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 74pi f:v zhb)byxh*tf 9k )w0mof length L. What are the wavelengths of the three lowest tones produf 9y0tx )b)f*hmvph:z4iwk7 bced 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 r cl9vme.od/vs 1rp)b :esonate in an open pipe of length L is 200 Hz. Which one of the following frequencies wil p1ml) sb.r:e9/ odvcvl 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 resgl0t fbw(c8;ooi/ v7 gonating at its fundamental frequency. Which statement is corre cgiwt8 fol;0vo /b(7gct?

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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 other, them (pq,oi5)ve,v cdry -x(k0 ojre

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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. Whvf,l,svi /f bp,j 8,sfat are the wavelengths of the three lowest tonebs,,,si flpv j,v8f/f s produced 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 pipe of length L is 20qjlo,y :t8 o-10tezw*cmz(ir0 Hz. Which of the followij8*qr e w :(-otyozlic ,mz1t0ng 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 closed at one end is resonating at its fundamenta ruf , f(a.bojpoj73/vl frequency. Which statement is cor/3rj f( jp7v a,bfuoo.rect?

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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 source. Each speakery no:;xe5x ,dajd/ 5:xkquoi7 produces a tone with a frequency of 200 Hz on a day :x,5/joudx d7kenia : x;q5yo 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, t*: fbvo2ubn8 ce n x1fzt58j4ghe 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 sounded together and a particular beat frequencf3zh k;u;yj+ jy is heard. What happens to the beat frequency if t3jjfhk;;+u z yhe 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 explainspu9 hm,4y hl1hmhbtp4q(qx7;

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approachwfgb *a(iszyz 3a8; *mes a stationary observer. The frequency heard by the observer ;i* (mb y gfsawz3*az8is

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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 3sh.6mki9hwtl(u ut0 gx+c8 mstationary observer. The frequency heard by the observer ilht0s +9mi(t3mk . xuw g6h8ucs

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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 wiwr ao*l7ms ixqke0 m,tbs )-12ll decrease by a flr2,i7 1x*s )at0ks wq ommb-eactor 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 freqj a7pgbb f )x/fa29lh:lbi.*ouency 45 kHz in air is 352 m/s. What is the air tempelxiffa*lb og9 a )pbhj.b/ :27rature?

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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 sounc).6pw*yuue.o yp(kxd4x+bs v t l32ud 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 emi 1xl5 h xhqgiq;c)z3(rts a shriek whose echo reaches it 0.0250 s later. How far away was the object that re (;xiqchx1rz5hqgl 3)flected 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. +tv(8iqgwbr;r )18lr byqxlgaa--9vs gm :0p 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 sgj1h63s 5) xnidt8mb o after seeing a flash of lightning, the distance to the3jmgh 8xodts i1b5)n6 lightning 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 *up+qkug;7h a from 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 and hear the s30x s3k:tzagc *( gyjzplash 2.5 s later. How deep is the well? (Ignore air resistance*caxk3szg :3yt0(gj z, 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 frequen. 7k6(j2 ozn osh:x 8f(aidoupcy 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 air t5tadic. km3 -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 ln.wss):-hv dl evel 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 /oe)un5 j. t drdoifi/lz/.f)-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 with i+ )92msew j1fe zfh2pgntensity levels of 70 dB eem)hfg+1w 92zfsp2jand 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,ad5v8 19ixpnovlgor dcqxwibh )4ea , )/3f+ 15 engines in a garage is 100 dB. What is the intensity level generatqo piwifdo4+ 1 ,dr hena vg)x)c,3/bx8 a9vl5ed 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 tt w;rph7sy1- chat is radiating equally in all directions-sy7hwrc 1pt ; 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 sourcewftjl(9j0m) e that is radiating equally in all dilwj(j9t 0)m efrections 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 im+8.cyzxq; cg5bh a6 ss assumed to be uniformly distributed in all directions. What is tyg+.;sa 8h xz6cqbcm5he 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 barking dj66 ,iw h*qk1lcf.y+sxeg1c3bryc ;uog. What would be the intensity level if two identi1c3 j* ,xwqc lc6u6y.1s ;ykr+fehgbical 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 sou;;b.bt,nf 8vbs2xl 8pz7ymz l/i q4xurce the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source ramb b 84.ifxll,bzx/s7uv 8n;2p;yzt qdiates 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. vku3) eqy;)gx,nrg3d At what distance will it be 75qgu,rgvx )n3)e yk ;d3 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 121io0fwi* s1hu00 Hz. What is the frequency of the four1his10 ofi *uwth 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 :zlzc ky.rpm2/9hx t 1is 900 Hz. What is the length of the pip21h :cm9pz/ z.k rlxtye?

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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 resonatdb mue)mt 909ge in an open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an 0d9bt)ug mm9eopen 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 altqe d1 m(6ce6e7 st/j length of 0.80 m. If the velocity of sound in air is 340 m/s, what ist(6 qldc/sej7tme6e 1 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 the tem6,p 1gvkir+;y es u7fzperature 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 p+cdz);4tuw;9 gs yh njm+la4 nipe closed at one end is 330 Hz. What is the frequency of the thicuzs hlj+9+;4a nmt wd) ;yng4rd 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 sho5 lrn2ev5j ne mxr/*d2rtest pipe closed on one end that will have a fundamental frequency of 60 Hz on a da22 r rlexj*e5nv d/nm5y 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 temp t 2la17f 1aocl(hx1vsq c+je:erature 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 ftv e/;wfk)x+drxst- 3m*y u/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 xylgyhwp++9n566 pi b0.75 m is played when the speed of sound in air is 340 m/s. What is the fundamental frwg6 6b lnp9+5px+yyh iequency?

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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 samwm9)7tb)dw b sm1h(gi e length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundame) ibts)( 7mb hw9w1mgdntal 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 ennr3r2va12cz -db (rf -m. cwvjk*4btsdfj5* ach emit a frequency of 800 Hz in 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 front of the sourcesv (f-d2 r4.3m-zn2 bdw 5rn* stf *cjj1cavkrb 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 db dq,a. yi)-edriven by the same frequency of 500 Hz. If the distance from a di)-eb q.,yadperson 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 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 frequenco w3g nqo k5ynr)79(gey?

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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 frequbmnsbe1tee+d-1k1(o(/ e gb xency of a musical instrument. If the tuner hears a beat f((s1e+ gn/e-b1b bdt keox1emrequency 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 soun sdq:9okc l5eymie ):0-bs(d gds produced by two horns are 6 m and 7 m respectively. What b)b9s-l5:q:s0e m y ci(odgedkeat frequency is heard 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 orches p(mgvh-r-36 hm ccne.tra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played.gmv cmn.p6 ch3-(er-h 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 ti 0*-pggpfty .l pi t2k::ak+zwice the speed of sound. The observer hears a frequency ofy*:i l:pt +0z-gf pgitkp .2ak

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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) appzj3 j(jnvg2t-)4 fi) a2xni uhroaches a stationary observer at ozt-2fnj) gn)x3 vij(au2 jih 4ne-half the speed 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 frequencyr 0f*zwcue /l.e7:k2tdie+e lf*wuw9 of 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 340 mki lre*z+l7fw ./: wf9t0e2ewuceu* d/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 travelin;3:juu8 nym : cb)*1 y 5/bj6bfdylpg yv(svepg 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 standing along the roadside. What change of freqjc; m6vf:8yv1lsgb 3bpju)y:u5y*e/bn pd (yuency 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 frequenc3;lflr e9 w:czy heard by a stationary observer when a train approaches with a speecw3 r z9l:f;eld of 30 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 at 120 km/h. The trkr2p*tsst7 y9vt3l1wqe l )o; ain blows its 400-Hz whistle. Take the speed oy tlw*p)sqrts ;ketvo721l 93 f sound to be 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 ttu trq.v.u y+-oward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do yo u rtq.ytv+.-uu 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 blo sioww(tzyc bmhe9: nqt/x2 (*15 e)sfws its 400-Hz whistle. Take the speed of sound to be 340 m/s. What fe os)9b5 tinwx2 :s1wt( heyq*fmc(/zrequency 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. os kdeupmew5/4), x5kIt blows its whistle, and you hear a tone of 400 Hz. Take the speed of /o ) skemp4kwd,e5x5usound 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 Hz. Assume the speed of sounkhc36bllu. s-d in air is 340 m/s. What is the frequency heard by an observer if the observer is movingkl3hu b6l- .cs 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.l 4 apzc+6oh18jo2thg Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train wito21hz+tcg6 ajlop 4h8 h 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. p96fww0lx 3qf dq 4cw) A 40-kHz signal is sent out, and a 42-kHz si0 w wf)6qlqwx9cdf p34gnal is returned. 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 sh kq9cok,nw5 y0bv 6q4jt+4xvdock 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 shock)* oyf7e6qc vz wave fc7vfq yz6*)e oormed?

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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 smh:*+ 0t ffg emw3s5u;mtwf pqm-12h United States to Europe with a Mach number of 1.05 where the air temuetmsmt- g0w * ;w25:3f1+mfqhhs m fpperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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