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习题练习：Physics Unit12: Sound
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)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://51fly.win/test70.html
 作者: physics  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 b)-8 n 6fvismuis a 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 conducted fastest thro*2q+mbomnhs,f3 t yu,+f,rs tugh

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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 sou6uv9p0 5s elx6pqfu3y6.fgf, rf t 8eind 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 h/ b9jlyax 19w gb6/nythe velocity of sound? (Assume that all otherxh bbnwly19j9y/a/g 6 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, h/y 2ty 5he ggz.ylyu,2b0 ad.the velocity of a 200 Hz sound through air dt2ag0zl/ 2byg .y,.ueyhy5 his

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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 Htb)o z3c :rw:v8ijm)hxsvv2).a*y r hz sound in air y3shvz:v)oirx*rvjh)tb:8 2wa .m )c 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 frequ bl;qi;1k ds9kencies 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 le 6jn)se*hru- yss 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 sourcr b9izlum8 5otcn5i)7e is emitting waves uniformly in all directions. If you move to a point twice as far away from the source, the frel 8nic 5u)7 zbmoti9r5quency 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 divergi,+amwru 7m:w rng waves, intensity 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 point source at a distance d from th8cnv3m(zcu;a 5 w/qtws5-zz he source is I. What is the intensity at a distance 2d from the sou/55ust3 n(wcvm ; chq-zzawz 8rce?

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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 rad9+((6ei d ob ub)ocp2swx gh4u bdl3t7iating equally in all directions. What happens to the intensity of the sound? Itu4+od ocdl w s3)(be2uhx g7p9(ibb6t 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 ii9paez5 rcd8e(+ o/l bs radiating equally in all directions. What happens to the intensity zpobile e(/9cd8+ 5arlevel 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 iac; t v)-wj-,5zxu/ rn;yslhhncreases 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 emitting a purehjlq,/h jr8 0enew8d; tone. What characteristic of t er8;h/wqld0j,e njh8 he sound 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 musical -mhe f6gvv:z.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" ()l* fu 7znoy4 zfpogk,5a r9nof 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,oc lu 32dl76nvta5yji*nek 0 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 ar ivsu9 1p5l (kbo0sv,asnp0i; e

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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 a9; p fuuym9,dvw g07ksound wave generated by the guitar as a res muw,ap v7gd9fku;y09ult 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 bothol p9m*k)u mas8e8jo3mu0 2ze 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 wavele4b**zj -8zw r b;vztbf9pjak7 ngths of the three lowest tones produczj4bz vpa -9b7f*jk*8r ; twbzed 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 2nuatv7*/)u3op( ,b rkwrn t ,2dald.i00 Hz. Which one of the following frequencies will not resonate in the same* 27ut3v (,.a/idk)aw, lrntopudrnb 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 frequevhqf: qvd,1 l*b0 m eles4s+j8ncy. Which statement is corrh1+:dq *v vjlslem0 fs beq,84ect?

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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 *3azmy/m ipbha8p .zlwh a(3; one 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 leng i)doq 0 y(j;.mqdcls-th L. What are the wavelengths of the three lowess.q (cimd)jq- oly ;d0t tones 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 5okp fdy(;nmj 1-ey/x is 200 Hz. Which of the following frequencies will not resonate in xo;e- 1yy j/pk(nmd5fthat 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 fundamental fre(m; e(l/l sl b:.vzpv m,xsg(fquency. Which statemvl gml:f(m xs;le.b,/vpz( s(ent 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 speakerilxsuwq4hy y .5z 7 2uf;in+7: p nen3+xwfo-ps driven by the same source. Each speaker produces a tone with a frequency of 20w qo3eyzsi+5hf;p 4xw.: lix n7u n2pn-f y+7u0 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, 9kojjvl)d 6b0mc/f9x oiw03d-hb5c et5* pw f the 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 parpqpx 5 ky )xc mipt26o:lfns2 .z;16gga k2;vuticular beat frequency is heard. What happens to the bep ;.k gpaxu2il21pf:6 v gyq2;56 oks)mtznxcat 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 expm,zs l/nh 6sd+-d+ jh-q4cwarlains

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approachesgxzuk :x zg:v /9rh,.mqrxj;* a stationary observer. The frequency heard by the observegrx;/xr*mv:kq.zg u xzh 9: j,r 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 stationary observer. The frequency he8)bnt)u r3reyard by the obse8)3y )ebrt runrver 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 MAC86(xyv7 *ew+ua z+-ka mwixqwH-speed, its half-angle will decrease by a factew*qk x+a(iw+uzxv-m a8 7y6 wor 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 ultrs j+x:1sw)mrh4j i 2i(-aqgcm asonic sound of frequency 45 kHz in air is 352 m/s. What is jisw+s:4 mi1)(ah2cq rmj-x gthe 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 5 ((c v hdm5xiv8vex5e/ leti9khho0*of sound 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:s-po7j:jye5av qge+ m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How fas7 :a:evp+oge-jyj 5qr 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, p b*uw6iyeqdvbw0: n 0n:(1jg and hear the echo 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, thextr)o d 2dw8/8+ohe a11lsmtt distance to the 8)aol xm+t /d128 1trowtsd ehlightning 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 a cliff on a day the temperature z slp/4qqas(u zgp zupn86xir54.40e 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 later. How deep tp59aa8 x7-typz)p p ois the well? (Ignore air resistance, and assume the velocity of so)7a- po5 8xyatptp z9pund 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 ctd+bjg k17a4 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 a m4lt(.sdqhpiyq5 2 /1bwf6lzt $23 \; ^{\circ}C$ 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 intensiy0i1o/zcc h) dty $10^{-3} \; W/m^{2}$?

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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-dB sou5wxt )f0q37j i;do mdn9bw g,rnd?

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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 int:(w s *;lc mcj6c)b(tttm2tl* lav3f tensity levels of 70 dB and 4*la26)3w *tl tbvcjlmct;t(( t mf:c s0 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 6 ij:ho39dof oj qj9hv6m,y+(dr yl,c15 engines in a garage is 100 dB. What is the intensity level gener j3(o ,dry69fhod hlc6ivmyj +9o: q,jated 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 frob,:r)7i4xpt; ug a euj1h2xwre v+, jwm a source that is radiating equally in all d: xr1+hurwgwjea, 42ejxipv t)7 ub,;irections 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 eq:+j9,cjk:d8jl a/ mxpy+mb ns ually in all direc,9jla:+m kjb:8cp+ysm/jx d ntions 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 y(ucv1xt3o ,(sa, x6vhuwn +uis assumed to be uniformly distributed in all directions. xa(+ ,nxwhu3utuy 6c, ov1v(sWhat 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 s 5. ngpoy.9tkdistance 5.00 m from a barking dog. What would be the intensity level if two ideyong p.t 9.5ksntical 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 tw tuzl5qo*u*m w),wsbk4 6j6f he intensity level is 60 dB. What is the intensitywjuu* 6bm) *osq6flw ztwk 54, level (in dB) at a point 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 level 5.0 m from a point source is xdi:y6zastdcz x7t)5p,.-il1ym b /z95 dB. At what distance will it be 75 d6i xytxz,mtiy.z/ :7)-zscd b1l dp5a B?

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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 qw4wt; lm q uw0c)uj/(frequency of 1200 Hz. What is the frequencw)(wmtq/4lu; cqwju0y of 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 third harmonr8+sa1 -4 m;dfo7mkajs2bn chic of an open pipe is 900 Hz. What is the length of tcmbhrankm2 s o-+d78;1 sa j4fhe 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 resonate in an open pj14(h rln* y9 ga8igmnipe of length L is 400 Hz. What is the frequenc1ya rmhgj8 (g n*9in4ly of the lowest tone that 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 soun 2 jn2pide81qnd in air is 340 m/s, what is the 122e8in p ndqjfrequency 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-bbl vint ,q y5:k9nw) in a room 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 h dh -:4vrv. 69gr30jd:1poe zwsuzlwa pipe closed at one end is 330 Hz. What is the frequency of the third har 9p0hw wu:l6szv 3rzeo4: djgdh-r.1v monic?

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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 pipel iyngv(sal*p7lb 6.d 7 bjwp;/ -q2ij closed on one end that will have a fundamental frequency of 60 Hz on a day when v2l l.g a(ibji6s-nyp7 p 7/qb;dl*jwthe 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 temperature tlx0:ufivcq tdm:61- 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 tek1r j hio9tct4qu f1*us5a .a;gno45rmperature 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 speeu 5wqq,/b -emkd of sound in air is 340 m/kw/q-u,beq5 ms. 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 and the other is um; x5vh71isjkp0t khahi+ 7lw91f +yclosed on one efii v7jph lk;w axy+01 tsh7u5 h9mk1+nd. 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 wher gty/7 f8fz:lmo)u7xke the velocity of sou uz gy)kx8lto:ff/7m7nd is 340 m/s. How much farther 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 side by side and driven by the same frequency of 8l r) bjdz2q o*zol/:w500 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 db:zrql/8w o)l z*2ojthe 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 -i 7ewdgjlwg b,5 1pwe5a 7h4dthe 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 fovcjf5:l k ,coc1 94d*u6dus mprk to tune the frequency of a musical instrument. If the tuner hears a9c6mk,c 5pcl4fv : ojusu* 1dd 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 are 6 m and 7 m rev( u7.jr3 ig. qkddwd7spectively. What be r3wdd(7ui qd..7kjv gat 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 orchestrz rs)d;)u 0:pweb luz1a 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 brilur1 ;:))ueszwd0z pbng 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 sourcep/te+ 4 zd iso;4cq es9+o9upc at twice the speed of sound. The obu9tio p+ccs49e/e q;s z+4odp server 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 bq1j adc2 l9:mHz) approaches a stationary observer at one-halfq1l:acd b9jm2 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 frequency of 1000 Hz. Ifl; -pp.; hmpbr a listener moves with a speed of 30 m/s away from the source, what isp rhbp p.;ml;- 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 traveling at 35 m/s on a day when the gib54bimjhu cz 8m; g1):8e ;n i(fpyyspeed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadside. What change of frequency doem4 e8 gynb(gm:b;i j)z5iu;yh icp18fs 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 stationamnt1/q1 99kds2g kku5avjzi. ry observer when a train approaches with a speed of 30 m/s. The frequency of t9imks5ntvdz1u qj 1kg9.k /a2he 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 yoc8w+ p,w.qi enef6+y pu at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency6np qe, we.f+w +ic8yp 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 traqs, v a6rq8gtws:,)tx8f;ze rin blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear?;,q6 rrva:8gx w,z 8s)f tsteq

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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(z2 c 8xuch9bm/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What freque98b2(zmu cc hxncy 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 it2dkgrorxh0 z1 5t/lihh dr*2+s whistle, and you hear a tone of 400 Hz. Take the speed rd1lht5rk+ xg hh 0zi2o2*d/ rof 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 Hz. Assume the speed of sounkm m.8s4cz nc;d in air is 340 m/s. What is the frequency sc48;mz n kcm.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 sc) lgtjd2,+b93obyr wpeed of sound in air is 340 m/ yd,w+bl9j)32grtbocs. What is 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 determwm-e fzq riuq;9l23g/ ine the speed of an object. A 40-kHz signal is sent out, and a 42-k39l rmwqgu/ 2zi ef;-qHz signal 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 shock wave produced by a supersonic aircraft t0er,6 oh w,zqis $60^{\circ}$. 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 shock3t 2/kg cgf;zz/swm6 k wav36gkmzz kw2 ct/f;sg/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 M3r/dgs bu8x;gyq (d2 fach number of 1.05 where th usq/fgx2d8y;b 3(drge air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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