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习题练习：Physics Unit12: Sound
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 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 statemen9mfucl 2mu md5; yw,h;t?

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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 conducte fycs :,czegna nv5*o04 7+phbd 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 stjz3zny5 un.cwg gnm *(:2c si;eel 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+; n6w. nufc9lah4 brn increases, what happens to the velocity of sound? (Assume that allu.w cnfh6a9nr;n+b l4 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 veloci q8yuwcb7a50r e...q8dsadleu vr4a3ty of a 400 Hz sound, the velocity of a 200 Hz sound through c q5y7vb qaw d04.e. 8r8a3l sreuu.adair 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 of72y.rutrgse g m:15cc a 400 Hz sound, the wavelength of a 200 Hz sound in12u sg.c5crgtm:rye7 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 frequencies greater than 20,000 Hz arpeb2q/ jp-sthw.g xs us9-w( ,e 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 frequencx:hntu m/5mf: y 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 directi- pr:kts gi,ds8t/p*jons. If you move to a point twice as far away from the source, the frequep, gst*:ik jsd-p8 tr/ncy 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 prowc22* del b;sb2+l bxrportional 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. What is tj/qebn p()2f9j8osi ppe u9m) he intensity at a distance 2di pje29p(spf o8)u /9bn m)qje 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 souihat +88/zhw k*r6 tee9eya(l rce that is radiating equally in all directions. What happens to the intensity of the sound? Iiah 8a/lk86y(th+z re twe 9*et 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 souxk wensl *s1,;nd source that is radiating equally in all directions. What happens to the intensity level of the sound? It drops byl;wsk , nse1*x

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the followii:/x(8q zf; i0bvb rnong increases 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 chafr:)oht qu9 5 zahqm89cqn30uracteristic of the sou 9qo c zq8h9 q5ut0ufr:ahm3n)nd 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 not,2c 0 h cwt6qz* a7mj1glxq5 .ggq1dfbe?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the "hk;ndsd m51 c8pitch" 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 wattdh d:j/+ smle11c5;bnr9 uc rer

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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 arepl67l h p; o3.j c evea3yc;j5t.;nbzh

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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 generated by th.o3;mb .zcm( lclebv5 e guitar obmm c 53.l.vecl(bz;as a result 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 both enalkw5w58pi yv ;s5c7 vds, 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 lengnf*e. wt)h52th) j wbvth L. What are the wavelengths of the three lowest t e)ntv )w .bhhjw5f*2tones 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 re0 irzy o0ee3l1sonate in an open pipe of length L is 200 Hz. Which one of the following frequencies will not r3iel0rz01 eo yesonate 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 frequency. Which stae7y qh -b)p-3yq3)ih+ alr,ppbjxp+kte-3yhj 7 ylebb)q+-3k,ip pq+r)pahpxment 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 at the ow.,k me0a lx3 6qfyrrfj8 ;rm4ther, 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. Whrkvfwb5o+sfh*;4o b 8c/,u k wat are the wavelengths of the three lowest tones pro c*voww,fk5/8u4f + sb rb;ohkduced 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 resonatk lnoggor,72-a0wbg ntdx +r2d; g +)pe in a closed pipe of length L is 200 Hz. Which of the fog;ng 2o7+lwdt g, rk2dg+p )nrax-0 bollowing 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 clf(+b u9. )gzfjkweli* osed at one end is resonating at its fundamental frequency. Which9ffzg) b (k.uijl*e+w 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 drivbs,zz oc g6nt0 ok/u.gl i,+v/en by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sgzg,c+sob, ui/ z tv/.l0 6nokound 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 6j :m8 v.hax 8rj85ne: yru3p5, vxmriul2ubiwaves 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 e1 s x/vc7mpd05 t3ue* )qgdepparticular beat frequency is heard. What happens to the beat frequency if the p0d xq tvum*d)13/ ceep5seg7frequency 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 expl2r6zl)wce /lsains

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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 frs w-aortm6pr9+k g-ihzt1-w :equency heard by the observe: 1swt+trka6 p igh-r--moz w9r 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 heard 06.)xjxhus-dcv zc- ; nwfwz2k ij6(lby the observej-x jwz fs ;c6)i2(0-wcn6.zxku ldvhr 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, iqx wpk:nusup(7,wj2 :ts half-angle will decrease by a jqw7ps ux2,un:wp k( :factor 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 so6fh my*tn04lg und of frequency 45 kHz in air is 352 m/s. What is the aigf h 6y0ntl4*mr 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 of sounrym 3 lx z1ap*od6z:i1d 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 3kta rzx-- 7)c(j) sebv40 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that rer(- t cvz bx))sak-je7flected 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 a1qe/pefqjey3h-bw o1r 1rgs 3 *( r-vin 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 afc bfi,i:oh: q9ter seeing a flash of lightning, the distance to the ligh9:c,: bfqioihtning 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+m 6pn.hn ;+2cci ub 5jwr 5-etnpj-zh cliff on 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 hear the spltbfc8: ss/sp90c/fbv te 9 .cnash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sound is pfe/tsbcfnt8/c:0c.b9sv s9 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 frequenwoc:(g e,psp yv )9gw.. t;bmncy 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 a 9)mk1-nmnzayiv 7dd;t $23 \; ^{\circ}C$ 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 inte r; kgc2h)oa.fxg0t 2jnsity $10^{-3} \; W/m^{2}$?

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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 soud v, nd*ymjd(,nd?

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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 theci0sdm r+ye6- intensities of two sounds with intensity levels of 70 dB an6r d-+0ymiecs d 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 bypg1o7zmz.78+ tpi)t0mkb 0 nn ggka 7w 15 engines in a garage is 100 dB. What is the intensity level generatedpga nmt7z1ikg)g n7 w0 opzkm+t78.b0 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 n m 13/z 1ejq)f(3pti0scimrcequally in all directi i)ft(1i /3es1c 0m nzq3prmcjons 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 r k7 ha-i9.ci d7ub+kiv h:mb8g 2bqm3ladiating equally in all directi-ck :7h82gbkdi mi+ .h3b i9qm7lavb uons 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(:tvee0yem/ a j5w9nkvaij: 3 be uniformly distributed in all directio0mkna5jej3at (i:v9:y w e/evns. 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 is 65 dB at a distance 5.00 m from a barkinllc *q-rrrtm 1v0/ s h/jfef8jon3/;ng dog. What would be the intensity level if two identical dogs very close to each ojn 3/r1rlf lj;oc sev f8trh-0/q* n/mther 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 intensity level is 60td8 r8qy7 9as adb7u* ilte0a0 dB. What is the intensity level (in dB) at a point 2.0 m fromy70sata e8 0ub7atr iddq8*9l 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 ow8 m+ow7236zqhvayk)emkdx ,,4j1vvl3bvy dB. At what distance will it be 75 dBkxv+v4jm,yq 28 ydowz)k6hv lebv7awm31o 3 ,?

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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 tt u:(:jq;mq8 hj 6u,*xcn mdbwone has a frequency of 1200 Hz. What is the frequency of the fourth harmwj6 ;j:x(uc8,d bu n*tmqh: mqonic?

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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 harmoni(4)q9 brs4eexl / cbzuc of an open pipe is 900 Hz. What is the length of theb 9rzu4(ele)bs x/4 qc 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 +;7(gp.z keih/qw*w4u spx jab j z0)y400 Hz. What is the frequency of the lowest tone that will res/;ijpe 7 qzbz.x ws0aw (y4h+k*u)gpjonate 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 aocvr;v+yt9 x ,u n..sj,gbcu2x+ tq10.80 m. If the velocity of sound in air is 340 m/s, what is the fr;r9goy . . tuc,uac s+,qv+x1j2vbtn xequency 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 temperature a1mp :l(urg;o i6qi-x 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 clowqpf gcxfhpsdj:z4 e7.d0 s392 l(:o nsed at one end is 330 Hz. What is the frequency of the third harmoppf:4df.z(720wnq hcoxs3g eds:l 9jnic?

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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 g+ jy87o5ghf kku)l)rkp ii+*4 k; wfwthe shortest pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of s 8 k*5kkg i)r+7o)ih pwwf;gf4+kul yjound 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 temperatu8 nc0pw:qktt74 7fyg pu8m9 jvre 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 roog7a v1c/ulmt 9m 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 pla:jt b;:m b+h;b rzf9nayed when the speed of sound in air is 340 m/s. What is the fz;r ; atbb: m:jfh9nb+undamental 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 su seu;2o.plf/ z6 7 isyn5nsch.1e c2rame length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundameu2 ;12 sf.ce7 pz.hsls 5nyec unio6/rntal 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 t7+14kpki;orz6hsgv9 fp .hbemit a frequency of 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 the sours z tbpv4kfr.hh o9;pkg67i1+ces 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)+z /r blqy7jm 500 Hz. If the distance from a person to one speaker +7ymz)r lq/ jbis 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 H4t;a)xevwlx:hj) xdb: x,x5 fz and 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 fork to tune the frequency of a mu qzye 5b).*8nbphr:xodbv x36 j(5 pppsical instrument. If the tuneyb) 6ob(vjpzxn3d h bp*.:ppr58e5q xr 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 gx24ij0 c51w:arnlek by two horns are 6 m and 7 m respectively. Wwae5l 0x jk14n 2ig:rchat beat 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 vi,ynr*0r5 trtd,ljy3 (:ouuv mrz 57uvolin strings on two violins in an orchestra are found to produce a beat frequenc05novr u:vtr3ry, jz5ml7rd *yut(u,y 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-Hzh:b.u6 k0og: -vhrfm p sound source at twice the speed of sound. The observer he.k0:hof v u6 :rpbmhg-ars 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) approachegh en5 e0i+qt8*dn (bps a stationary observer at one-half the speed of sound. The observer hears a frequency on+hd pen*eqt(50i g8bf

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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 frequenc1u* - rxvsjw7.gxr z*jg -kyk6y of 1000 Hz. If 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 is 340 m/s.)6v-wruy71 gx -*k.k jxsjg*zr

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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 sib 4sx4/idz-9m. u )-fxtrnrhpren. It is traveling 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 chang .fn p -)riz -sbmx4u/dhr94xte 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 :7 r*y9 f(skemytq* mlc*r9o uby a stationary observer when a train approaches with a speed of 30ftm ryy9qs(c ke*ro9u:m l* *7 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 toward you at 120 kv)h . zcc qs p;blg)r.2n8wy7sm/h. The train blows its 400-Hz whistle. s lb )zh7 )c8scwr ny.pg.2;qvTake the speed 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 12lswxm5za7gvd s2;8;te t5vs50 km/h toward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do yw s;evdv;25z g5xt7 5 l8mtssaou 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 yznm o)3,urj 7dou at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. Wh,du37 nm) rzjoat 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 n 9) -yuwm.,wmm9cc1kkd rr+cvr;(x+wkm xy+at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the 9v++r)y+k9 c.nm1cd,xmryxw -mm rw k( cuw ;kactual 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 in ar7 x+ ,tw)o9s8uv uq8*aucxiw- 2pn kvir is 340 m/s. What is the frequency heard by an observer if the observer is moving away from thewut*c9viwx u-, q88r7 k)s nv+uxop a2 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 s, xar0o.mram 7d/j+q vound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speed / mrxrm0o,a j+7vaq.dof 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 ofyag)nnj7(xzmc.k- p4 an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the .m(kapzn7cy x- 4j)gnspeed 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 shybr 4m *2yhte4ock wave 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 i7kk a516tsaeh s the half-angle of the conical shock wave fhk7sk6e aat51ormed?

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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 Un zy u( 95l4-jghm +vkrcjpj-3zited States to Europe with a Mach number of 1.05 where -z (rl+kgmh-cvu9y5 j3jj4z p the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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