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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 is a false statementv;:xe fdp +ub ,*hh ce4+ryp(u?

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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 condu r9fot 41wyzp*cted 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 sound in a steel rod?k3u imif86o,7c2x4nc8 h oqyd

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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 ddv.5qw k*51i mran2i: f ovv( msig3 8+gs2wxthe air increases, what happens to the velocity of sound? (Assume t i8 swsm+gwrii2 mdvnx5f:d ga3o1(k5q v*2v. hat 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,in(v6ghq+ 2yiz l0hm *l1 19ityv ebr0 the velocity of a 200 Hz sound through air i1hhy i+ zvmyt9lrl( v6qin*2 e0big01s

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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 u2t yvvd4pj1r+mc5 /v Hz sound in av4p5vj 2/yuvc 1mdr t+ir 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 greater than 20,000 Hz arell ll/i rik ij58h:5q8 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 les s :lljn*+usl9/obt 7gs 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 sox:tmd14uet+d/nea -jjg,k g,. lwu+e urce is emitting waves uniformly in all directions. If you move to a point twice as far away djng1:uju e etw,++ ka e/l-.mx4,dtgfrom the source, the frequency 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 diver5xlj7av: ltiord 6 (a0ging 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 the sourd: u,yiz1et8*rksmnqq +* /ao5mg,hc ce is I. What is the intensity at a distance 2d from tq,5 usm z1ck qgo:my* ih+ n,/8ert*adhe 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 equally in all dxle7skq5f-qw:pd/t 9132 ikum bs0tfirections. What happens to the intensity of thef-2/sm piwex51 u 3k qbfq:7tt09 slkd 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 radiat7exdbxv *2iz(ing equally in all directions. What happens to thb e xv*idz(27xe 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 ine+ m/w)cjhinhj8a:e )creases 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 pure tone. What characteristi.o ;amk2*qlkb x1 kx(ac of the sou qx.mb k;xao *2kla(k1nd 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 noteqjy 34rqosr6 *me(cfilqip w+v,+ /1n?

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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 musical note? :k,iar2n24 go5bgjwp

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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 a0n:uxj xh0z2g ir 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 waves armqwpe, o e6, xm.0.pfie

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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 wave gn.kymz78m oo+sv5m4 t enerated by the guitar as a result of this v +nmm8m5 k7ts. vzoo4yibration. 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 ops 9 v25lv8ntb5aro g81:hpd lxen 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 lex 30dpt9f x1a5ynts r/ngth L. What are the wavelengths of the three lowest tones produced by tts x10 ptxd/95rfy3n ahis 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. Whichobex -di8knr4h z/alc8 0n0 g: one of t b0xrhdieznl4808gn /c ko-:ahe following 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 fundament mezl ut)s*yn4e--4zlal frequency. Which statement is corre* -4enz zumyt4l- els)ct?

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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 eqs5w ejfnt rt+at 595fl5t rva63; 3uat 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 ln1lkc 4das2bz9x6. fsength L. What are the wavelengths of the three lowest tones produced by thl4anb fd.2z1k6s9 xc sis 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 2 gfa9u)ur;4b2 fixfbq-q5o0ld.n 7b q00 Hz. Which of the following frequencd;-f9b2x fnqlo 5 .uq g4 f)7iub0rbaqies 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 resonatinnjs0o/4stgn8l6dtu nun:w ;s 2,f ,qxg at its fundamental frequency. Whi/sd;,lf nuq02ns jo 8t:u4 gxnts6n,w ch statement 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 same source. Each speaker pr*+ * z rs5qn9byvlilw+oduces a tone with a frequency of 200 Hz on a day when the speed of sound is +q r*zi*ny +b95svlwl330 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 waves shoul ccg ,b8fae-q4xo s/w3d 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 fhowd8da)m+ uwhpw 0o 4gzmup 4-zj(/7requency is heard. What happens to the beat frequency if the frequency of one of the tones +- o74gm4wowwm0) hdjh(8dupu zp/az 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 expn m 95i *.lmar9b kfd.j,sj5balains

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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 ua7-h+w3r+0eyz 2uz+ic . y dg,onxtka stationary observer. The frequency heard by the obsa+ w ry0cy-t2k+eg zno7.d ,+3uziux herver 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 frequenk ov5p52lto32btce6u x jb.u2:)cj1fz a j7 eqcy heard by the o1 2u3v) qxcb .5oe tt6j cjza7ubelojfk2: 2p5bserver 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 doublexfl c ;szz5z:o+g:)wv s,ijh/ its MACH-speed, its half-angle will decrease by a f wzz/li):,czh v xj:f;s5s +goactor 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 ytf37olmb) 9 9q *7z(irxdqja45 kHz in air is 352 m/s. What is the air temperature (*f7 x)z3tqib l9m7 jyqdar9o?

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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 s6ye5 n ;4gxl-en/hezbound 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 emits ap/k gseo .g7+b shriek whose echo reaches it 0.0250 s later. How far away was the object thgpes+ogkb . /7at 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 a6-mk5;*r2jrvscp 0 ffzrpz xbs 8 49tin 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 dislhn;7n5 ri5.nyflz *;krz u+otance to the lightning strike is r .i;ylu*f+r5h knn;ln o7z5zabout

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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 icm2o 41ekn9b 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 d gp2 bkmn3 +sx(8z7rw9l 0dtz: ufv-zneep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sotfn7uz2+vz k8:-zp9bxn(s0mgrdlw3und 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 qk1 m)visy* j. a(xi( hun6k.tfrequency 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 at a ,cu5e, ,bicsc01x 90qtsxhd 3q)cit$23 \; ^{\circ}C$ 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 i:syn+ 1zvib q7da(en1ntensity $10^{-3} \; W/m^{2}$?

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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 soun zg,ek/4gos u;d?

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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 int*fs u;(0eftjlensities of two sounds with intensity levels of 70 dB anj(e0uts *ff;ld 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 enginenm)7ep n .d,efp;uc na4n y4ib5au 3m4s in a garage is 100 dB. What is the intensity level3n u 4acmnf;uinep , 4m)a4pdbyn5.e7 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(9yor5b;)u oij 64sejqnk*fz p8 -nc s a source that is radiating equally in all dsnpjb;yn 6j *qs5uo 9f48(k) -zoecriirections 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 dis:km(abwew)372nft be0qdh 0 htance of 6.0 m from a source that is radiating equally in all q72 w0mth0nd3 e(f ahe): kbwbdirections 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 deliveu2lx*a;oc oooi2q aan/z wba..,- hh, rs about 1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance2alo ,.- ciooa/ qxb;w a uzaon2h.h*, 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 di ;/.1;rzypl0fz rpsl-n)w fsdstance 5.00 m from a barking dog. What would be the intensity level if two identical dogs vef .;z;lr)prz0 s- fpw1dylns/ ry 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 n4lcy +o pr;o-m from a sound source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that r o -;op+y4lncthe 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 d4-tt t2m)wu vbw41ro mB. At what distance wilwbt) rvm2 tu4 t4m1ow-l 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 frequency of 12006l; (3r: rpddx zloe2 7o69s7knyyq az Hz. What is the frequency of the fourth harmodl6372 76ao9n(q s ze;pyzxrd: klryonic?

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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 third3 yxzcef*n; v1:p oo ew333:alaq .npo 1wyk.b harmonic of an open pipe is 900 Hz. What is the length of the 1v3cen 3.nz:.ak fbp o o;axqo13wew:y* 3yplpipe?

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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 o hvakjt8sn2dq ta)8 hq86p3l* f length L is 400 Hz. What is the frequency of the lowest tone that will pt* jq3qsaa86)dlvk8nt h 8h2 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.x q0zteqf*z (t8rlo; both ends has a length of 0.80 m. If the velocity of soundo 0.rfzl(ez;tqt*x8 q in air is 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 room wher j*fzm4d4 ky;fe9 e1ow7tixb3e 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 clo2 h/ej9m cyph*hlq0+ bol)zc 9sed at one end is 330 Hz. What is the frequency of the third harmonic*yeq02lhp9/9h o+ cbmhc) z lj?

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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 onv 08cr b4h2doh one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sou4bhhv8 r2odc0nd 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 1gyc4/h*0qm fpawxg; 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 vj ;zr h3it3f.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 speed of sound in airf8 oqu;cw0l* j is 340 m/s. What is the fun;jc8wlq 0*f oudamental 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 close.i8d3z7l-g co qky 5 /eef2tkr)x2ykdd on one end. If the fundamental frequency of the r2 ex ) /cqo3kldkd2-ky7zft.eiy g85open 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 where the velocity ot6xnn. 4zgm2wx ri: r)f sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in fro gwmnr:)t.ri2z64xx nnt 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 freq/hzmfbm )3c .kuency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person 3 m fhbk./)mczdetects 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 andmqmpydt 4(2 11, sviqo 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 forkq*6wxjd04r v tr 1maik1oee7, to tune the frequency of a musical instrument. 6i q 0ka *v1jmee1r,4xtd rw7oIf the tuner hears 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 productx3t6:)ogm dz ed by two horns are 6 m and 7 m respectively. What beatxm3 zgo6t :)dt 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 orchestra are founv3p5eo;hku 2 wd to produce a beat frequency of 2 Hz when a frequ p;ue5 h2w3okvency 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-H-kj,v(em jqv+z sound source at twice the speed of sound. The observer hears a-mjv+ ( vqjk,e 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) approaches a stat(se(sf/ ;e0kb sgayl 0y9qsw*nb4 e 5eionary observer at one-half the speed of sound.f(beyel*5wa 4/ s0gbs0kq(es sy ;9ne 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. Icml*z h 8xeu;w:1ee2rf 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 e1zmx :we;uh lr8*2ecis 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 o+is f(rl:p 42uro3 oq/0vtwgyn a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing alf3g :(0t 4 lu+orqpsv/i 2rowyong 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 statiotvv9g mc(c:k .nary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound is 340 mc 9vckm:tg.(v /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 1j;-c.l zkvb. j20 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequencycb-j.z k;jl.v 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 jbh ,l )suz5raj;o0x (stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do x ,hubasz; 5ljj)r(o0 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 1201o mbtaad6o70h j1y(p km/h. The train blows its 400-Hz whistle. Take the speed opo17(ha aj b16 tyd0omf 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 km/h. It blows its wh-bt0) k2j-mx.p f4m 5vhixrnoistle, and you hear a tone of)i5pj-b.4o -f0vnmkm xr2txh 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 7l (pwf8 ygzzj 53mtm95tzr+k horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What y gzjr 8m(zk5f+z wt9t5m37plis the frequency 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 speed of soundohz xp/+jwz-pv)u:scgl+3 8zlj 0k q0 in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a skj:8/z zl 0c s)3uq0ohg-p+ wj x+lpzvpeed 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 deterz:zy fxqx00alp4 j.c 7mine the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the objc0f jyxxz0p. qla4 7:zect 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 rk 9xpcb47aoh4uv(2pv 8pdy ks+ - 1eywave 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 cl5s:fgzcb2g u: d:w9is the half-angle of the conical shock ggsc2ulcd95w: :z:b f wave 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 o -regy2/uhh50ts9kr-nsz e 5h f 1.05 where the air te5he/ gu9h rszyh0 t e2n5-skr-mperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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