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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 statem;.v;7ze6gdd unwa 4ucu-xu2aent?

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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 co 1m9ztf 8pli37tc1kd:b u;3x bkybgu8 nducted 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 2tt8ul .jtihc n0 x)a;( b:* 0jucerhpin 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 happenw e3p8-* q0xelim 47ui*x mzuys to the velocity of sound? (Assume that x-m7y*e*m03z w luii8xu4qp e 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 w-oo 4;35zenr z 9te*fkywh:iof a 200 Hz sound through air : o35ewkzz we-;4 *hr fynto9iis

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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 Hz sounc,/tvhkzugd;4 i cx27d incdg2xi, z h/7vc t;ku4 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 are calledcas:) /jfq1wp

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with f+v ic6(jhgtg)4 b srbs30; brntu*h2drequency 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 zov5r2x/c.q hmthob/c6xj 0: waves uniformly in all directions. If you move to a point twice as far away from the source, the frequency of the sound will bt.m oco5ch//2xjv hb60r qxz :e

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  For spherically diverghf(ut 8mz h2v:x(d) rping 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 source iu1 ix v gc)beo0:q 49y.-nw*ansdgdd 7s I. What is the intensity at a dis7i4va:y gsbu9x cwndgq-1o)nd0 d*.etance 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 wss*7qwhzyt n u5 2h *8w9gkl:radiating equally in all directions. What happens to the intensity of thynqh92wwu7z8* sghs*l:5 wtk e 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 in all di0bw9ln 4 dgzg7h8gdj 4rections. What 7g0 glbnj48zh d4w9gd happens 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 as a souhb-voak gq59r o8.hf2at 5i5vnd 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 chh3k zf(yfk1 b+v5zy5 ,q6b bmparacteristic of the sound ik+,v1zmh kqbyf fb63 b55(pzyncreases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" o3x m *tf-on2wd 2eq4n l,je(ixf 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 mua8lyo8r3 9kj/xm jj275c,cm 6aynrfosical 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 fr9vtgjbufxy)- j 3 (978 jtcpug1k3nqf om air 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 x2 vbtalpr+(; 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 walx h t04i7*vqay ly s;:t6k:evve on a guitar string and the sound wave generated by the guitar as a result of this vibra vtvt:l7h: ys* xk6iy0 al4e;qtion. 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 whie/l6mv .:ctt+;t c ujgch is 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 wa8 b+w9e).fk1lh pu e4wpc6pzesjr :qw7 *6wqhvelengths of the three lowest tones producedw7qwe hl6ufepw8q9 bk cr swp) :p+*z1h.64ej 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 open pipe of length L is 200 Hz. Which one )e lwl5o 6w(a) umd2hb-s cnm/of the followic -(/ a2m6w )wobslnhueml5 d)ng 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 aochdaj * -,2oad*0mvuqk 7y1vwqe(. L is resonating at its fundamental frequency. Which state-u1oa*q v a(ahj0 7*e2c. v do,wqkmdyment 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 clo)sdadb8 )6fu nw6c a:wsed 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 wavelengths of t v)l8r nlg (*j0poxeb/he three lowest tones produced bbp vjngl elo/x(*r08) y 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 resona+fhh tyhq-q (i:q gg ko0g1 /xd74rq3ste in a closed pipe of length L is 200 Hz. Which of the f3gohk4rg qqi( +gtqq/ ds: -h0 1yh7xfollowing 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 f5 8lw ni(d.)j,)ikd ewnr0ekeundamental frequency. Whichiewdekew(r) 0nk5.ji) nld,8 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 d.npiw+j 5 xkke0bq6vvf*7pdq6; * fforiven by the same source. Each speaker profp d766iv;jkq xbwkpe 0o+ .*fvqn5*fduces a tone with a frequency 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 ):zc d7 mug y2bfk7qd2/mcx:x 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 particularqgi4x o j1kx .xh6k(pnb(g8)h beat frequency is heard. What happens to the beat frequency if the .xgkhx6pn x)8j( k(bo 4hi1gq 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 olxm98ntv2v2h vdwo ++80gwds

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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 sta cubjjgr:r:7- tionary observer. The frequency heard by the observer ir bc-:jj7g:r us

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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 by the nl;zmrj+:jc8n8yrw3g -e p ,qobseyne8rj qc3p8r:nzml+ , j;- wgrver 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 ha9t haik(v -:/-hxl6pm+fn e qllf-angle will decrease by a factor of(ihf+-9enlpm k-a: qv l/6htx :

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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:hcuv6mjdf. 8aq, (c v kHz in air is 352 m/s. What is tc6: h mq8.a vjf(,cdvuhe 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 speed oy as62fhw r3g koy:fu81sx1/bf 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 +13c6oe kcoqt76l llwjza3(b in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object thec( lz j1l k 667aooclqb3w+t3at 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 w42 bevsmrfk,kctu f,8+0q0nyr,,u8 n skq ;itemperature 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 light nkfksbk2yo:pp*:/ : 1x.stee ning, the distance to the lightning strik: .bfo:skest:npexp1yk*/k2 e 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 ,kv8nj 2s/zfa,*(kl nk5 mqs cday 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 splash 2.5 s later. How deep vviwp ud: 9;ikf. wv*./6jo .:rfv xrwis the well? (Ignore avk f/ii;vw. vrj.6rw*.p9fv:wdo :xuir resistance, 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 sound gc,kmb s 2qm65kl(pw-ne9 dgs8 rq;q2wave 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 at110.jql .fmxguhxm a 1 $23 \; ^{\circ}C$ 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 am*ac1 jdr r0/y 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-dB be (;r/m id)rt(/ffo e v(bfu*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 sougu; 5n+uz x:4s4 o r-r:rulybrnds with intensity levels of 70 dB and 40u:;yxrr4 obn 5lr4sgu+u -:rz 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 engines in a garage is 100yyzsm5r8q8,ymtb2: ng a*f d6 dB. What is the intensity level gyy2rt6, a: dmbym*5s8z fgnq8enerated 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 souriikloy d :2/cckk4* ,rce that is radiating equally in all k i*,kck c2d :ily4or/directions 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 radiatig s-q(3xmd1doqkj5rym ((at4 ng equally in all directikd3qxr(dq5t-my1 g( (a mo4jsons 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 uniformlwu1 x)wy3:kbjh+ :qei y distributed in all directions. yhx qk:j u+1:wi 3ebw)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 sj/se:fa2ggo * sr fw;0ej3.w a distance 5.00 m from a barking dog. What would be thew so2 . gjwrgefj3fa*s0; s:/e intensity 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 intensity level o/yuzncx2z s;a 8m:3fis 60 dB. What is the inmz o:8s;z 3xnfy/ua2 ctensity 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 distancukke m994nwbhn yn*ml/m 9v( 6y1l;nae will it be 75 dB *e 4mal( yw9mun mnh/9k6ny1nv;lkb9?

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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. monixok9r8 z.l( 5 dmz5/k ,(tg(bkto What is the frequtldxkn /9mo 5kz,g(m( (orok5 i t.zb8ency of 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 j v-.x .y1tawo06x ueqan open pipe is 900 Hz. What is the length of th ye j.x0xw-u t1ao6.qve 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.m u/ tva4 s0ij 4.g4ecae:oa)s0e/dva: chqv Hz. What is the friq vad4tchsvee 0/j0:4sa.ug4o)cm e a. a: v/equency of the lowest tone 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 ends has a length of 0.80 m. I z .b03i8fkq9,fielpg f the velocity of sound in air is 340 m/s, what is the frequency of the second harmonicz.iek0 gi f,lp93 bfq8?

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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 ivdew7h5rvc bnih1d.wl (c/,7s 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 closed at one end is 330 Hz.er : +n fh uo64p2foif1d-nbvo2:vg3 u What is the frequency of the third harm3uh ooon 2e 1rdvfbi:g-pnf+u4f6:2v onic?

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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 wilrxhql9a. j4vims j agj)2v.()l have a fundamental frequency of 60 Hz on a day when the ajx4i v .mvj9 sgljr.a2qh())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 w(x)ozgcm h5azwyz x 6 1m4g3g(here 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 temperj5 u s6ry sa)gg.5 euipt.*u3n9*ftlf ature 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 c,l7d 6 gw*n6zz,zhr/k n+kzw sound in air is 340 m/s. What is the fundamental freqk,,kz6 wwnz*+/ dnzcrzl6g h7uency?

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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 ts*ebose6b 2fjw7r8 2rhe same length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe ib 8rewbf r 26s7s*e2jos 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 ed; xgz72backh7ag4u mr (8c.c mit a frequency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would soub;hrc 8a7cu7g.dk4x(cm a gz2rce 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 ftkh 5;d 7cvi+vt9p vv3it)9 bjrequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person detects little or no sound,v+ tivvdh tp;)3jc5vb t7k9i 9 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 fre9g.(d ml08 hyw(z yxff(+uvjcquency?

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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 fo b8t5.t3 8qgw,j wmp.5pa mqpnrk to tune the frequency of a musical instr g8.wq jpqtnb p8m,5tmp5. wa3ument. 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 anm m ) *z;co9alqdk,q12ruxo s3d 7 m respectively. What beat freques ,)*o;c or1zm2qu a9ld xm3qkncy 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 tw mw69f /x2(r hlbx*e1xs tcuo.o violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension of one of 9 xewm 6/f*ho 1b2 r(xtxs.cluthe 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 at twice the speed of s*.29 ksnq(k/+z 7v srfejwss pound. The observer hears a frequenns+s7q. rvk9 /w*j k(e zpfss2cy 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 s44mq7du6 ax)j5ug lxbtationary observer at one-half the speed of sound.6qu x4 ) 7a5l4mgudjbx 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 xhiq 1wifb(6.1000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the fr6(i. 1bfwxh iqequency heard 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 svdn/xp3h .cm/iren. 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 ob. /ph3m/cnvxdserver 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 btv8e 6-8nio ew848bzltz sd1qy a stationary observer when a train approaches with a spee 6818n zv- wdeoti sz84bq8tled 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 toward you at 120 km/h. The train blows:etq)ys e5i1 i9b: dzi its 400-Hz whistle. Take the speed of souiyd es):9:iq5z1 i btend 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 t1ry1.a4xzl fr. 4y8 tl1w ehtstationary train. The train blows its 400-Hz whistle. Take the speed of sound to br1y4et1 1 tl.48rftyz.hxla we 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 km/h. The train blows its 400-Hz whi sf.r 414r3sxe. +hlpw mtxp*ustle. Take the speed of sound to be 340 m/s. What freqrhf1.lp*4 3 ps+e rmxst. wux4uency 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 d9cr*/b8+ai q+tb8 nzg z6iru you hear a tone o8z+ cdbrun*+irt8gz 9/b qa6 if 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.5)9jt1grg 05u9t a(j swcy:kah8ihir Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is mo59tsg:cta 8y(1ug hhjir90r j)ikwa5 ving 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 -.7vk* v nyb1ofk r2iaspeed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speedyb2 i*fo1k r v7.anv-k 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 determvjb+qum ojpd825+ 9kq0 *mz5 kwe g4gwrrb22mine the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speedu8v 2 b0ww p+dr5emb2+*z jq5 o92k grkmqjmg4 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 coni nne.)ni9 x8/xhm 5scko k(4nvcal shock 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 Maz ts)zp9 ,ltx2-8xgjkch 1.4. What is the half-angle of the conical shock wave formzg k2xsl t8x9t-z),pjed?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Concord airplane fl *5qhkn6wx:inqofxf4)y6 /(h eh.el wies from the United States to Europe with a Mach number of 1.05 where (eh*)hn6.y q f46xw :fw ke /qxho5ilnthe air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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