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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 sta /z(bpf.m*vxyb+0kz j tement?

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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 thro5aos ii)k2p c. 6 p,lzixub5(ough

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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 inh-dbdu /4zm1d 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 velvr 9 whan62c93sbbx(tocity of sound? (Assume that all other facto(c 6 stbb9x9 nr3vwah2rs 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 velociti31fd s6m)r xqrf/sxm9 ,v* hiy of a 400 Hz sound, the velocity of a 200 Hz sound through air si3*qm, h6) 1fsrx /xdmfr9viis

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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 o8tjhr7k7oc0c .d( tbdf a 200 Hz sound in a7d(rdc ho .t7 c8k0jtbir 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 H5p3 c1e7uqbwmq e* )emz 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 20iw (4:2.gmxodkf t v6)zkho3t 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 sou t brpii:kr87t3+eyf*6 t9rn6boj.wq rce is emitting waves uniformly in all directions. If you move to a point twice as far away from +p i t687 tk r.rytjbeo: wi*9q6bfrn3the 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, intensity is proportionalut / qms3p6pfm9mkg; , 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 atu4:x(vpp a7ovxbua3k, 6 qvygp,4q*r a distance d from the source is I. What is the intensity at a distance 2d from the ,g3 u6av7,vqa4*b(u k:qxpo4rppvyxsource?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distayrg9s6z y4m t.js 5be-nce from a sound source that is radiating equally in all directions. What happens to .sj9-g 6 yrt54zbem ysthe intensity 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 sound source that is radiating equally oa, lf gkx10idv7oxc1d( v7)f in all directions. What happens to th0do( xv id fofv7,x)1l7c kga1e 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 as bhp)sf sz2z.x;3w )yua 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 emitfvsip - g*r ffkp:2touc(9 sr;p(h-z6ting a pure tone. What characteristic of the sound incrsv-ifp (kpprorh *;tzc6 :-fug2 (fs9eases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" o( r ajwv+9uh/xf a 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 musical note5 cp )j0qeda9c?

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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 int7vk()(dewx u tjup0+ oo 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 w4d5qc/cdlud +aves 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 wave gener-hao hm5 rjlx .s0-i)qy3p6c wwbgl8s65w:lbated by the guitar as a result of this vibration. What do )lb- 6bqc 6oy.g5hw5lil0arhjx- 8sw: 3psmwthese 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 isg ei3all-u 815m sdy(x open 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 length L. What are the wavelengths of the three loi(: df2g3 3 lz ;v9(hjmzzf oy ,3ffwlthqx2n)west tones produced by this pipei)f2 gz h3 jyfmv9d2 q zzw;((3hffx:3 l,tonl?

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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..u.q:2vx si:kdn- wuag2 ue g6 Which one of the following frequencies will not resonateuax g:wesiu2. :v.qdgu6-2n k 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 fx -,hm/fli cdj2a9zgi+ 4 pfy:requency. Which statjmh/lgpix+daycf:9, if 24-z ement is correct?

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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 ab4s2 jtne k7nl3x1(p zt 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 length L. What are the ) : crya64wsula;) cwywavelengths of the three lowest tones produced by thi r6asyww4)lcuy;:a c )s 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 200 rww6gux4cbls26 * lf-.v2c zj)jn0i dHz. Which of the followin jfr-jx0d)w sv. 2nl6wucc*4biglz26 g 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 fundamenth:h qwr 0/3g k-z)ifqbal frequency. Which statement is corre/qw i:rhhb -q)gzk f30ct?

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A person stands betweennpna.l1: +sdix8os7f u z z+w- two speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. Thz8 ul ws:1n+ xfnsapdz+ -io.7e 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 twoe y n)5+eg;xla)he7kf 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 frw4 gsa)y+ lw84y; ue7n cxg3ncequency is heard. What happens to the7n;3g+ycsw)44 a cw xl enuyg8 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 explain:jnz q.x,hpr )s

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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 observer. The frequency heard by the o o+u;kj,: hph5 h7b. 5zv o7,*0ehrov yoqtibcbserver is ,h5h*5; ko.r7e7tv+yo:hi0 uzq, covhjpobb

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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.vf/7(4gb.3a. yd he ujebnyf/*tv.k d The frequency heard by the obser.aye u k.jv74/(en ybdvb*dgf.ft3/ hver 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-a syl6ut*icbc96;p x -pqm /8jspeed, its half-angle will decrease by a factor of: i/apyj *9s6c ;8c xm6tpu-bql

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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 45 kHz in air is 352 m/s. 2omt,o),-3uo khenig What is the air temperatu3n2mghk- eiot,o ou,)re?

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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 speel *11c2;0ptpsvftu xad 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/s, a bat emits a svsc+d m1jf):khriek whose echo reaches it 0.0250 s later. How far away was thcvj)f+ ks1:m de 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 temperatuq0j)oejtbh4a h*td1 8re 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 seeinjavx,bk(5i/ 3ogta wc1h.4cwg a flash of lightning, the distance to the lightning strike ig 3hci,tk cb/o v4j51wx(a.wa s 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 is xh8el w* oo(lvog6t5m008mb h$15 \; ^{\circ}C$. 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 dc)ggfg39bh h .eep is the well? (Ignore air resisgb chgg9h)f3 .tance, 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 soekl qgjq.c 3ts1t.,j 7und 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 huv6 zh0is +( u vuk9bi;g6d2qat $23 \; ^{\circ}C$ 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 ogk2lyko8h w4gy0.r s)f 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 70-1:g wyz35mwj j7t i(tndB 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 intensitbs(lhzc5pz4 p /19gc zy levels of 70 dB and 40 dBl p/ bhzz94gcc5ps (z1?

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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 garagdxh,*t hxb0 7i ap9xnbpv88;je is 100 dB. What is the intensity level generated by one epdt7pxa ;h*bi98v,8b0njx x hngine?

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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 s 0xlu/7 dphvy1ource that is radiating equally in all directions 0/du yxv71hlpis
$6.0 \times 10^{-10} \; W/m^{2}$. 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- ;na+z. zfflh is radiating equally in all direcz.l+f;a hfnz-tions 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 uniformly yq57sxbv 8i/jdistributed in all directions. What is the intensity level at a distance 5.00 m from theqv/sy7 jx58 ib 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 dog. y3:s zv1vat6mtbpm8x)q 9r u,dab. x+ What would be the intensity level if two identical dogs very close to each other arvvt mx9).bbrd+13zu,sy 8t qax6pm:a e 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 the intensity level iu0k rml) hvn+wr*jluk9f,0(ys 60 dB. What is the intensity level (in dB) at a poinhj+) klr0u v,kml0fuynr(9*w t 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 levelknqy t8gx079 c 5.0 m from a point source is 95 dB. At what distance will it bx8g7kcyq 9 nt0e 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 compvfi0+34re +an+iwu y 2pj (jb,x+ruijlex tone has a frequency of 1200 Hz. What is the frequency of( ++a+wipf riruvjjb xu 3i20+ je,ny4 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.-wjrwhua .471uvl0bg46 vo)hm ly /fu What is the leng7h4h b 0muvl/ygwoj4fr-6 .w)vu1 al uth 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 lot la-zv 2gwn+ d m05ke exn3)s.ql28sength L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of len-.egas ) l8xv0 k23 wo dm2n+tl5zeqnsgth 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. Ifx retwm7r+p w12):kcr the velocity of sound r+ :crp x wewmk21r7)tin 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 where the temh 8wdajb9z-f0 perature 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 closed at one end is 330 Hz. What isoja*ey+4 (non d6vs, n the frequency of the third harmonicyasjn+(n*o,4n do 6v e?

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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 shortestntx1kl8 zc ;.p7*fcba pipe closed on one end that will have a fundamental frequency ac cz8.xn1l*b pt7;kf of 60 Hz on 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 ko bt p;m+; ;-j/bxm zuevms 9)thk8u*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 where the 8 v0 vxlu ,ieh0zd m9 h(tdi*bm-;w*drtemperature 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 i/ co.n b6b:5in w3dfcyn air is:.yi5c c6/d3 bn nfwob 340 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 open and the othk256t1kq c/oar , j0o arhtc-aer is closed on one end. If the fundamental frequency of the open pipe roc a6,q- kaor5 jakhc/0t1t2is 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 o*))hru g .ybr/n*n vdv0jaa 9cf 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 t 9bajv.dy rnrn*vu )0)hgc/a* he 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 500z,e 5l vyr5 *q8y6kybs Hz. If the distance from a person to one speaker is 5.00 m,kysvye*8l 5brqy6z5 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 freque7e u5z5 dk2psvncy?

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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 hp+.wyq-t .lrs1fb 8 pto tune the frequency of a musical instrumr-s 8ltby.q.ppfw 1+hent. If 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 produced by two horns are 6 m and 7 m respsi,:dl 0 vmg+gectively. What beat frequency is heard when the horns are sounded on 0:lgv,+m gsd ia 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 orc 8ym )gri(i 2wd6zkp0fhestra are found to produce ay28wfmkpi0g6d (rzi ) 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 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 statio- srefe3w 8m;bnary 1000-Hz sound source at twice the speed of sound. The ob8wre;3-s mfe bserver 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 Hz) approaches a sp .pr :kf2q)jxmufk:9 tationary observer at one-half the f r:2jx 9:kp.fm) pqkuspeed 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. If a listejm)qq3 bsk w3d (d8l(u4pnwa3ner moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound spen ak3qlpdwb)js wd8 (3q(3 4mued 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 trave 4k0ni v7:rtaeling 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 frequency does the observer hearanri 704tevk:?

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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 (9f wq .wm37buky+suwa stationary observer when a train approaches with a s .7ymw(wf 3ksu w+qbu9peed 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 tsh j s6e:f,6mt/ z/(ndi1h yiid: -sxtoward you at 120 km/h. The train blows its 400-Hz whistle. Take the sptj hnys:e6:s,/1 mx-sf t i/ d6iizd(heed 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 toward a stationary train. The train bs vyrn9cvac9;p ;+ohx op8r 16lows its 400-Hz whistle. Toy 6pxn;aoprs8 1;9vrc 9chv +ake the speed of sound to be 340 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 k.:r49jrz - gnhv;t4haaqpfc /m/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. Whaa :q4 atjf/;crvrh -gpz94nh .t 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 k6ie;qc(hpc5h h+: *x bnzsl4l m/h. It blows its whistle, and you hear a tone of 400 n(hh 4 x5e6cbp:i + ;*qllshczHz. 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 speedmu6,:o.bf kk u of sound in air 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 30.0 kkfuu:6.o, mbm/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 iso9/zc 2bqygg3h8*+ m*t5owvytll7 tc+o.dl e 500 Hz. Assume the speed of sound in air is 340 m/s. What ib8wl *7tdg z. 5+coc*h29eq 3/y ovtmy gollt+s 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 determine the speexdbb(qm g84spxn c4 z16fdw48d of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 34cq8m4zfsw 8n1 bd6xb gpd(x445 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 supersonilgaptzs/3: eziv;gpgw6 :n 87c 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 theyz w*y.a; v t/*o4zzju half-angle of the conical shock wawav.z* j ;t yy*/zzu4ove 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 Sth4) sgc5 w7oxxil7m k8qnl*(sates to Europe with a Mach number of 1.05 where the air temperatuilsnm7 sq(*how 8 4x5 xcl)7kgre is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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