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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://autoconfig.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://autoconfig.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 4 bvr rmxjxjrb)q,:6*is 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 condu vjm6y1c5 0koycted 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 rocol( jmh asff(g5)n7.d?

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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 velh-9, *3c mj phqkyq7doocity of sound? (Assume that all oqmhjy39-ck qh7* pd,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 200 Hz sound throu e(mmemog vp9z+*38hs gh aims pee8+ ( gohzm39vm*r 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 ; )b* -0srwov y pm2bjzpnh+f(t;;yr c400 Hz sound, the wavelength of a 200 Hz sound i2t ( ;+h*ynow 0 r-zs;)vjpbmrp yf;bcn air 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 frequencieso/da ohedw9e;s ;05spr (ll bf l*ul.+ 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 fr.8x90 dgq9g6w veqgacequency 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 emitting waves l8pr*x 62zvdi j;h)ih9/djsruniformly in all directions. If you move to a point 9j2)*i8pi/hld x zrhj6dvr; stwice as far away from 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 diverging waves,5ami6nr sq (11vdt/iy 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 source is I. W- f:dt:cyzaq(rm m;p:hat is the intpmma zt;: dqyf(-cr:: ensity 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 rad5th9.vp2c*3zblz u yo iating equally in all directions. What happens to the intensity of theh9yolu*5ptb c2. 3v zz 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 sh(0;k8k)v t qn idc ;5ob-voujource that is radiating equally in all directions. What happenkvud ;5vj q)oo b8c;knhit0(-s 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)seey(gf/c1b otj42 x 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 ch un*d7-lufmn)qo i9 he)z/pz,aracteristic of the sound incre*/,9 qnd)p7nzuhomzl - )fuei ases?

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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 n(k*d c jc.s zo0om/6bnx ld+v,ote?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the vn b0 (ud k4r8s6kplb+"pitch" 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 watv-t 9x6el /mdker

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wark )dm2ed;:oe exe8 y2jx,-acves 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(i i 6x7 io qqq-7klume4/vsk: wave generated by the guitar as a result of this vibration. What do these tw4 oq6kiiq(s7vm k/xui-lq e7: o 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 endsdypm +zq16s eg :-h(dq(t9rmr, 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 wavelengths of the three * x qdg7z0mp ,pq6sp sn0lov k91un5p9lowest to9vs7pppnd x 5 6lp 0*qsg0z9mk,n1ou qnes produced 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 opensh(xj:nnt67dz md-w6 pipe of length L is 200 Hz. Which one of the following frequencies will not resm7hjdtn -z: wsd6 6n(xonate 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 frequencyju+:jbr.fh ji- t8 7l: ck;bzc. Which statement is coi:fjul b8+cjt :h jr.-c;zk7 brrect?

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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 aowh+11iwg.blsg/t0- bcjms 4 nd 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 length L. W*u34mbvkg vm n5h mldh6i2- m+hat are the wavelengths of the three lowest tonesm*mv 5hmndgb2 6-hm v3+l4uki 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 z::xbp6rz if )us:jh)4+nvwi of length L is 200 Hz. Which of the following frequencies will not resona )zis :hfz+46j w r:ip)bxvn:ute 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 re6-x7 l ynfzq77txa-kv sonating at its fundamental frequency.ax-q-7 7f7 6tlxvzkny Which 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 betwx; rv7ic 9q+n q3cda:aqb:6xa een two speakers driven by the same source. Each speaker produces a tone with a frequency ax:cqrvn;a i3 7 q9aq+x:cbd 6of 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 tsqf*wq;ctj 16*z. w7b)nhj g 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 frequqkl d 8kt--znz; z, lrg2l.x)hency is heard. Wx-r8z- ;t)glqz2 k,. lhdnklzhat happens to 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 explai)zeaa( u6x kav; i0gw5g1m6n dns

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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 stat-ubfqn k6m87z ionary observer. The frequency heard by the obserk 8z7nqu bm6f-ver 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 frmzbk y4 -rm82bequency heard by the obsm zb-2 bym8r4kerver 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 MACH-speed, its half-angle wixni9 q:.w6io q7gd kwsz16i33 cck.oyll decrease by a fasqow:in yk.ci3x. 6o wc7 d1z 6k9g3iqctor 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 sok0ye5a-dn5n3ee t-9 osrlv8jbue8 8tbj2 l: mund of frequency 45 kHz in air is 352 m/s. What is ttsal-l239y -bm:e 8nej5r0 n8 btoudej8k5v ehe 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 o4 ur+w) znfa8mtw 1v3+9r.a7s scdckspeed 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 m/u-ydllosiv qv 8;f6+ e0-or d ch,-b(ds, a bat emits a shriek whose echo reaches it 0.0250 s later. How far awayc o ,ld8d-yvv eqis+ or-bh-fu(;ld60 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. The temper+gr .02gt xo6z )nmrrbature 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 dp,x.p;e5a p 0 3xmk-lx1cdffiistance to the lightnm 3fx,pp10. ; fda5px-il eckxing 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 t5i qwlf6ep 69iemperature 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 isu/qbj /fk7c;mvv ** r: l7qp2.5 s later. How deep is the well? (Ignore air resistance, and assume the vevkmpqrf; b/j7 cus *ilqv:/7*locity 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 c)4+hsu fc md1sound wave of frequency 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 4rg+mn cqh h-vck3 n:1at $23 \; ^{\circ}C$ 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 soe y62wd uy8fx6und 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 7020vid d5ei;f 8f5c *, bjgchn)xcsnq( -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 intensityz ;dzf -,5oujn0ed f (:c5gczx levels of 70 dB and 40 dB?z5zxfoe (-05; dujc cdzgn:,f

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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 t))feud9 .cyx the intensity ld9ce x)uf.ty) evel 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 a source that is radiating equally+a2j/jamubg +v:ock ; in all k2 u;a:ajcgv /m+ +jbodirections 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 va. oej3xw7r6 from a source that is radiating equally in all directio w .eavx36rj7ons 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 /*obm)5zni, ez3 q)oqqu8x qf1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.0*uzfq3,zq qnqmbo8 ))5ox/ei0 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 p5ex ub36n9shis 65 dB at a distance 5.00 m from a barking dog. What would be the intensity level if two identical dogs very c5n9euxphb 3s6 lose 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 sou e i24vmuj4vghm 6b;ta2 0kmn5nd source the intensity level is 60 dB. What is the2j mb v2m405kumth i6;ganev 4 intensity 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 95 dB. At what distance*..e vlis nq-7q xqm1a will it be 7s1vqm ql .x iq*-.aen75 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 1200 Hz. Woz) 8j15lqlzz9de 1qk hat is the frequency 81qzj lzle k59zqd)1 oof 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 harmonic of an open pipe is 900 Hz. What is the k6a+ k lcih/*-ufweo,lenguke+k,wc-l h/ 6*ofai th 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 resonate in an open pipe of length L is 400 Hz. What is the kmf52x .mp 0u(odj h1cfrequency of the lowest touhp(d1fkx 0m m cj25.one 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 en./zflb4e3 +mk 5gi thzds has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second harmonmi3e z/lbgk+5 fhz t.4ic?

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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 i0,v1b8 kuppa rs 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 a pipe cloo4wgld*fp 91 kth hx,2sed at one end is 330 Hz. What is the frek42gx1phol f*wh 9d,t quency 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 shortesc c2w4bikd v4dn*4rm)t pipe closed on one end that will have a fundamental frequency of 60 Hz k2* cc)dm w4b4nvdi4 ron a day 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 temperature * j fya2hy; zt)siar/0n4v :vmis $20 \; ^{\circ}C$. 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+cl.vlqpb*7efnv* v5p .hey4 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 soufs; l- defc;a4nd in air is 340 m/s. What is the fundamefa; ;sd4l -efcntal 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 0k :afb+lbo/c; 2hf v2o3juokis open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamefo22oc;klujvbo0 k :/bf 3ha+ntal 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 tok r9/f6jvn 4the velocity of soundv9tn 4 f/jok6r 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 frequq uqw07)d-a hf7q n1spency of 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 7hqqq-u)w nap07 1sdf 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 frequen zih(6hi*d- e2 ih; xdp)8prkecy?

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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 frequencb y/mg8:yulc10od6ziq 2+ vtzy of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the qvyl /b6o d+t80c1z 2m:yzgi ufrequency 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 prou czb elfm 5p9 :w14dn*pql/t3duced by two horns are 6 m and 7 m respectively. What beat frequency is heard whenn /zt : f 3d5pcq1l*wb9lem4up 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 foundbt9za8 q6;gsj to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension s9ga6j;t 8z qbof 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 statf*k j 4)- ihqy(4tnwqsionary 1000-Hz sound source at twice the speed of sound. The observer hears )ysn*(ij kwq- f q4t4ha 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 stationary observer azpll;wc q4 9ys.ga :g5t one-half the spee.s;:4 az 9yggqwlcpl 5d 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 1004rxziprk-kh)n0, sk. 0c5q we-( z olg0 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the.gzkqe hr -zpkwrn-0i(oxc 4s, )5k0l 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 3511d -gj vxlug9lg 8ke 63dtvj* m/s on a day when the speekg3v81 6 devljgjxudt-*lg91d 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 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 stationaryf zhpp -xb 67dh57b k2wwzb2b; observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600zfhb6b 25d7bw; bp7 xkw-2phz 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 wdha8qh*2 )o,cig7cbi 5 .iwqml f)7)ohb-b snhistle. Take the spee*dmh 8l7 g.-,i)bcqioaob)h5wi) 7 snb fhc2qd of 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 topo dl v-e ;tna0nl-:,gward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What freque tnpolld0ve, a;: g--nncy 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. Tbbbum cycx3/.1kr r)x7n r h94he train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequenc. )1mrxrbcu b nhk9/cr47yxb3y 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 whistle, and yomj, trl9/y9mszcr i- b19 dp2lc(ecg(u hear a tone erj9-m(cdm,9(gpli /lcrc byzs t2 1 9of 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 Hz. Assume the speed of sound rw+jp:p0k 5+2bjzi qa in air is 340 m/s. What is the f i+:5 j0k rbjpa+z2qpwrequency 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. Assumlj7f0;m)j: oku. 7pjp- (f dtfmyok z*e the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer isou. fflkkfymj-om(0;jp pt j7:d*z)7 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 v4(9td mzpls3dvw( x6object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How famt6((s3vx ddwv9 p lz4st 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 -t40i qpf/ng vhssf71aircraft 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 thenpyb n zg+*op.e 2.1aq half-angle of the conical shock wave fon.n*+ oz1g pbyae.p2qrmed?

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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 0ys(urs:x+y8kw)dbm8dyou k zc f4*:from the United States to Europe with a Mach number of4:+0rmxcz(y o: 8s df*kb)wys8 kduu y 1.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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