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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://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://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 is a false st oldtr dn t c72ngs(), yq8zya3-6d9fgatement?

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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 fnv5l )bm+j5g+4q1i e3xcomhfastest 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 /i-p 1sjmloz1i,u ;yxh/dh v: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 hap+6kuu sqk 7,gv6u 9aua4ril9hpens to the velocity of sound? (As ur,6uil uguk+qs4v9ak 9h 7a6sume 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 200 Hz sopgp 5d26 jp d1* dnvvo:np4bn5und through air isj*vn p65pd g 5pb2:vpon4ndd1

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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 q1r h+c qin8exsdf5) ;of a 400 Hz sound, the wavelength of a 200 Hz sound in air i+qx51ir n d)efq8c ;hss

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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 greaw1xh8 5-y2-g hdnd tfzter 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 frequhhbbm q* runws,s7,24 ency 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 uniformly in all directid ajv5-nxkt 2.n *drt7ons. If you move to a point twice as far away from the source, the frequency of the sound w72dankvtt* x5nj-r.d ill 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 iee eudv 1:9:eqr 5bba3s 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 pointx1l k-36bpsrxb5 .yah source at a distance d from the source is I. What is the intensix hy.s5pblk xb 3-1a6rty 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 radiatingofe+c g+d*)f ;om,pdxhguy) ; equally in all directions. What happens to the i)gd+co*u+,efod mfg;; y hp)xntensity 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 equa(8tje83r9cv vqtq y 9olly in all directions. What happens to o9tjc v 9t88yq 3vr(eqthe 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 a sound become9 a h5r :b/qoi(ovt:qms 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 spo35 d7hn+o wasv kb:8xeaker emitting a pure tone. What characteristic of the so:dv nxa5o wbksoh783+und 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 vs7)xmwo akmz d 6jzlj5.56gp(u8 aa8a 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 mus79j c8va0 cbe g1,sjafical 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 into6xz8t5l onz3mo * c,tr water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacemen k. j-;py2aclft waves 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 w)u pgd yqhh6h;lar- ckf1b-89ave on a guitar string and the sound wave generated by the guitar as a res-;gqb8u)-h 1hr fyak 9c6lph dult 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 s z81 lommz89 .fflmlpy.pd8 3is 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 l+0ry ndf87f7pncb l/are the wavelengths of the three lowest tones pr cpfn8+/rfly77lnd b0oduced 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 opehy4 wl/cvmh4 )gt (cd6n pipe of length L is 200 Hz. Which one of the follow(v tdly / 46cg)hhm4wcing 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 fua j3+7k cboh0sq.tk.zndamental frequency. Which statement .tkkhb.oc3 s07ajqz+ 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 at one end and closed )8sxlsjiiqmlqj6ot 3 46 wo0 q y2-.vwat 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 Librwjv6kjf + a9r:aenb5 n*46 . What are the wavelengths of the three lowest tones producnba 5i6a6:9rj*jn f+4wrve kbed 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 cloi(ua w8 2 ,0fb pozg;w)ay8urn6;awnosed pipe of length L is 200 Hz. Which of the following ow;upbn6f;w8r2(zwga)a8o y au0ni, 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 ubg bt2 :uwe,+at its fundamental frequency. We,tbubuw: 2 +ghich 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 betw3lphl. 5hgu:l 4q u:znx4zx6eeen two speakers driven by the same source. Each speaker produces a tone with a fru3 .hzq: e hx5unx lzg:6pl4l4equency of 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 waves should ha jk 2afnzxwj5oxnc59*r 35- m9uiwtu4 ve

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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 ajqjml18s+2dc 7/ mznf particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones is increased8 +/c1mnj jsfdml2zq7 ?

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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 o qc:2 yjrpfow-iaknb /6(3-cns

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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.-0i1 kx9:ar5fg h dnau fr9w/6 eark(g The frequency heard by the observerr1:g 9kad9e 5 / f-hxiaw6akun rfg0(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 froml1kytu2fs, z seqbb *-d1c.9y a stationary observer. The frequency heard by the obse-z12u. y9qc, *bsk1ey dsf tblrver 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-an vl8y 7yy3:evbgle will decrease by a factor ofb78ev3yyy vl::

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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 adr5ng/rnn47air is 352 m/s. What is the air temn rd5rg/7an4n perature?

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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 sound in ax(tv7djuhjl1p z);a ; ir 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 shriek whosph a-0) e1bflce echo reaches it 0.0250 s later. How a c0)f h1-elbpfar 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, and hexn5*ha1oksfr0 ub 9 t6 +8isr*yyjpbdy4 c1 m+ar 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 li9 d ztjyu97td*ghtning, the distance to the lightning strike dyj*9uttd 9z 7is 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 o)nhzcep/w //y*mvv 4s1 4-iw5amj btr n 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 heaz*dwl*h* -rr+z-)rusw 9i hq zr the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sound is 34zw+ lzw zsi)q r*hr9* *-urhd-0 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 bi68gl+ow wd6r:jlgc+ kl:v9 sound 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 aiygkkgd9k;lw)5/vzo; r lqb wfx9p9ur2( 1 *kyr 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 leve;3 v uua3,c1-okd7qgrum.arvl 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 intensityq,;ngcer0f5 8lgpw xg,vm)p( e7az:f of a 70-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 oflu2u3k s +04ws1xw9 pwynss*p the intensities of two sounds with intensity levels of 70 dB and 40 sksnp w lu9w2y01 w*4 spu3x+sdB?

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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 - vs v)na0-tcdis 100 dB. What is the intensity level generated by one enga-tnc0 -v) vsdine?

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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 distanceyu ckn7ds )843 ivisup;x+i k3 of 6.0 m from a source that is radiating equally in all direction8iis3i ;xudvc)suk+ p34k 7yns 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 marjf+tgp**s3: o5 sia from a source that is radiating equally in alljs*ps ar i53g+ao*t:f directions 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 o1cy 0ma5mbfnj5hvr )0f power, which is assumed to be uniformly distribujbar5mmhv5n c) 10f0yted in all directions. What 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 iskc)tj brysd:0 *ltpgi49: qc8 65 dB at a distance 5.00 m from a barking dog. What would be the 8dt* l0 sq:tpg: b)jc irc9k4yintensity level if two identical 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 the intens(k, 5thclkqg 27y9)*df wf kueity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equally in all directionse9 tkc 2ku f,*h)y5gfl7dw(kq.

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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 hyj9lrzc8 khbq*h /5-j .y.tk point source is 95 dB. At what distance ./byyhkh8 c5zk.r*lh jqt9-jwill 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 1200 Hz)r763 wre yq-a7jebu t. What is the frequency ofe)t bw7y6 r7-erq3aj u 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 Hf;/eabg2bszl y9pn30 v,evm1z. What is the length of the pipe?m,fv ;p2l /be9s1zy av3egnb0

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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 resonm tdo1- fh-w1vo3oa;a- ur ,fpate in an open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an openaf 1-ot rwdpo1,vf3hm ;-oua- 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 velolntz l7rbi4(2ny1t j n7xdo54 city of sound in air islb7 1nxrl2tt(onj45z7 dy4in 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+s/p )qe;xpe9t 662 grzypel z 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 closed at one end is 330 Hz. What is o27sbubrsylss p7;f+8 bg co.5r7*p nthe frequency of the sg+purr 7fs .bc pys;5o87nbb* o2ls7third 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 shortest pipe closed on one end that will hh4 q)uewb.gxdudv, *+ x,y jn7ave a fundamental frequency ox ,uxe)gwy b+n4vj qhd.u ,d7*f 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 roomebd (+6qmdz/5 jw5 nnbwmcq 6; 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 isg py;0)i wcfu01 anii8e +q9yc in a room 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 phr,b7yst9r+ when the speed of sound in air is 340 m/s. ry 9b,7 sh+rtpWhat 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 opeu6 75iab-fl luuk-m+yr ez;ux47 ccv.n and the other is closed on one end. If the fundamental frequency of the open pipe isau 6zle4rc-.+7vb-57yuiku f;m cx ul 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 velocifj6a tq;mfts,94ppr: ty of sound is 340 m/s. How much farther back would sou,4prfja6mt s:;qft9 p rce 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 fru.x/ilfvk 7* uequency of 500 Hz. If the distance from a perso*7/uul.xfv kin 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 bfv8.oa gewam72ns 8 xmj.( 1s;hbg:j peat 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 fork to tune the frequency0r( f5cq5eo35v xlp1fgz byd / of a musical instrument. If the tuner hears a beat frequency of 2 He5bffx dl0r/pc35( vg zyq1o5z, 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 respectibkp+*i(8/o 4tpqx-s twe6ntzvely. What beat frequency is heard when the horns are sounded on a day wtkoi6q /4xbtpes zt8( *np-+ 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 found to pro3l8e59n(tzov t tzsu7duce slv8n7u9o( e35tztz ta 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 stationary 1000-Hz sound source at1mzl0gd 2cihpf5 1 ewh+,*z8bmv1 caf twice the speed of sound. The observer hears a b5dm0gaw+pz *zh11 f,cmhevl 8f1 c2ifrequency 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 w7+8ewd:anxx+v pj e.t bv;e) a stationary observer at one-half the speed of sounnwx. wd ej8+vab:t)x7;+ve pe d. 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 listener mo( a-lc xul3+ln(g1.msf-jq nkves with a speed of 30 m/s away from the source, what is the frequency heard nmkf gl--l(.qu+a j3ls1c(xn 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 whe4t jm.t5hs uf*7t/ ecnn the speed of sound through airh */t n j5m4te7c.tsfu 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 /,slm-vj *y6 ny quut5a stationary 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 m my6,/v- n*y u5jltsuq/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 400k +s-3ux hq5kt-Hz whistle. Take the speed of sound to be 340 m/s. What 5h3kkt-+quxs 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. Tq 9.ssj1 boefvt)t6)++ujqbg5 s9ilr he train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do y 6geqqu5 irlt)b99o+ts.vjb )s+s f1jou 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 - 33:qu8 in8ohib ljjqv +7:d3azbzoytrain blows its 400-Hz whistle. Take the speed of -vu:obydh33zz3:jbi +an8olq 87qijsound 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 whistl w(6skbtd.w g9 z;/lt kr*gm8be, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequencytrklmsz ( .6bd wt8w;gk/bg9* 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 m h *pjsif, m0plt-bww;w-73e in air is 340 m/s. What is the frequency heard by an observer if thejs-mblw7 3pw m;0-tefwh ip ,* 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 sp*ypu*6- 5h(y2norpt ih(fpe r h.1kce eed of sound in air is 340 m/s. What is the frequency heard by an observer if the obsee*hyikr6((pec yp hto f.*-5n1uph 2rrver 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 speed of an object. A 40-kHz signal e pp- taq6 gt ;fdd.9y/fcv31ris sent out, and a 42-kHz signal is retua3 cgyft9p6 e;rdpdt -f v/1.qrned. 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 supersos;)vyqe-5-m lqse t,- h eq4b80sncilnic 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-anglew -/iwnfyx m:2l bsv8( of the conical shock wave fbn:v8l(-msxfyiw2 / w ormed?

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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 United1;ejk6 td;f kl States to Europe with a Mach number of 1.0ledf jkt; 1k6;5 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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