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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 falseqz*u/1b8 dc) m1jo p5c5ev qxp 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 conducted fase+mcrh1 z6 )bbtest 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 rq5t3 momb;yn- od?

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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 velocity ofxi sz eg24bt32)uk c9t sound? (Assume that all other factors remaixt)k e st4 u32z9cbg2in 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 cmwdt+ i h.48svelocity of a 200 Hz sound through air di.4ch tw8ms+ 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 uwqe1zm) u2kb-6i; m w400 Hz sound, the wavelength of a 200 Hz sound in air isq) -kb6uizm1me w w;u2

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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 ar3kg8 waca2fzw*,th 1v,n0 nzwe 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 20 Hz are call ,zks +17 wig7vy2g-f mdnq0wled

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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 uniforh n3b/*1t)pkjd 7phf2s1ip )3 p otqjp5of n:nmly in all directions. If you move to a point twice as far away from the sou1h b) 3 opf)3 71s2jpp oq5ktptn :dj*fpn/nhirce, 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, intensity2b9gmik6nk ba*y+0a z 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. What is )nszz 5h2) -xip 9xuapthe intensity at a distance 2d from thx)) zpi2x9a us5nzh-pe 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 radiating equally in all dd9- jauo;p-f ;vv fwz ca3.sx,irections. What happens t a;s ,p9davjzvo .-xf cf-w3;uo the 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 sm:1 7g kxmst+sound source that is radiating equally in all directions. What happens to the intensity lkts:m 7 mxs+g1evel 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 becomes iflgs3+t wu,(ma px-0louder?

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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 character zhj/a nu:zx-kb3c/, ,nlessubv 8o-;istic of the sound j -8x u/ hkzc:;,n-/bsoenvzb3l,sua 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 enkn3lhk)c;-z au 1v-e?

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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 nr2vnnr.*3g,il twp8a 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 froet38psk-j nz7mbo 63tz u/ k(3nfcel+ m 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 are kq58ml yxpl.0

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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 anh ckl /80n5 a,atqxm5jd the sound wave generated by the guitar as a result of this vibration. W,/l5acnx8 50h qkmaj that 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 opex; dlj(*rja 72fzy4q;g hy og9n 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. m) x(7mfvybo ) What are the wavelengths of the three lowest tones produced b)f7 ymm)ovb (xy 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 oshn- n78 )nyc2l zyf*if the following freqzfs) nli2n7 y-8 chy*nuencies 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 funda5vthbb/zbr -d70 f5nwmental frequency. Which statement 5w-zh / 0nbf7dtbb5v ris 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 c-zuh d0v-l* thlosed 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 wavel2sp4d+ kpula zxy(9) sengths of the three lowest tones produced by this pipxak(sy+ s2ppz4 l)u9de?

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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 Hz. W)9fcuu1lzun 1(r2sk e hich of the r uu9ckf s2znu)l e(11following 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 -iuk (8gx1wk s3z yqk8is resonating at its fundamental frequency. Which statement is q zx-kwu1k83 k8ygi(s 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 driven by the same source. Eachw8f*;fl , 9vi szpto)w speaker produces a tone with a frequency of 200 Hz on a day wt;vow*8w )ff p,lsz 9ihen 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, thehx2c-lb4 o8k n two 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 particulajq /+tm4)isr er beat frequency is heard. What happens to the beat frequency if the frequemrq4stj) i +e/ncy 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 expl ss04*r6lp3*q bin;fq/k ;i8sz alokz ains

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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 unl8p e*-nin( the obspnu8e i*-(lnn erver 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 hearrn ydy 4c9uo.4d by the obser 9uc.dnoy4 4yrver 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 413mmr ,n0zpq ka 4t7,mgy-8ktgqgzt half-angle will decrease by a factor gttr8q 7qng4,pz0k1 3mmz t-kyg,am4of:

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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 f4.2 vvib g q wm0nzkuy 7w13fugps-gjmh i*,4;requency 45 kHz in air is 352 m/s. What is the air tv.vw 24*w-k4g by3z;mi 0sjunh7fqi,u1p mggemperature?

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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+0g(uh b h1mkecyr- e, speed 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 shriek wg tmeet)0v4e; hose echo reaches it 0.0250 s later. How far away was the 4 ;0ettme)vgeobject 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. T5 jqu:fin0a;kz-w bv-he 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 a*rdy1yv :x6flx9alx4 fter seeing a flash of lightning, the distance to the lig* dl xy41ay6 r:f9xxlvhtning 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 tempera zh 397kb/folyh:2qa*uwin1w ture 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 2.3r3*m-zc xn.g ,p noon; b8,j mc+vuhp5 s later. How deep is the welmcoc n; uxrh3o.j n8b+gp3mz,p nv ,-*l? (Ignore air 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 f. paaug722u/j jdx)ynfa 4 n8of a 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 aing aak91k h-)ir 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 lc 3 hw7,x5qdjdpt5*ktj):df level 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 intensity of a 70- racvp1(s/9gd;cg-t c a +(tuydB 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 wi 8. k/owvzq*mwdc3:a1anth)sth intensity levels of 70 dB and 4omhdca1w. :v/8wn sak 3)qz*t0 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 100 dB. What is the intep7cwc75*e 9 / dcvnljwnsity de n*/jlp5wc77cw9 vclevel 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 of40x.0s 6wa 8eaqj cbmh -,xbpm 6.0 m from a source that is radiating equally in all direseaxx0cmm08-jp b.wq,a6 b4hctions 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 radiating equa 8x abw)rj+3gaxu-gj 3lly in all directions8bxgg w)jruj+3xa 3-a 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/u golgl 7*b3andqd369ibs o6 about 1 mW of power, which is assumed to be uniformly distributed in all directions. What is the inteb 37 q3uagg6s*ilobd n/69lo dnsity 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 9m0i/l/ y3a(e.unw dsyxbjxa;h x:/o barking dog. What would be the intensity level ahy.9 wjxad0:/esn o(y/mx 3u l/i xb;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 /s zb-0 ewrmqvp/k7 (i rxt365q w,egyis 60 dB. What is the intensity lg75wvme-iw 6y3s,p(r qk qextrb/ 0z/evel (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 f:ekyrm(r5 7l3gca8j grom a point source is 95 dB. At what distance will it be 75 dBe: 7 3k8yajrg(lmg cr5?

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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 ad i9y.i10zhm64 di+i-fqdgpbu z 5m4e frequency of 1200 Hz. What is the frequenc- 1emu zgyi0.bp46zim d4d59+q fidihy 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 an open pipe is 900 Hz. r + xrli0m4j6g What is the length40mxgrr 6jl+i 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 thqt5-rfk cq66 ne frequency of the lowest tone that will resonate in an open pipe of length -cn66rqq5t kf 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 veloc9 g-bvlhk/6zy ity of sound in air is 340 m/s, what is th9zybkhlg/ v-6 e 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 temperature is v2 oite v1 hnj0zj y)(q(fr*we2 ,p.dmt-np;c$20 \; ^{\circ}C$. 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 H9wgk7gsv h0l :z. What is the frequencywv0hk s7lg:g9 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 shortest pipe closed on ong5f(mudbbl+0p i7,iwl 7 +cobe end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound ip+ + i0i,7 mbf5bl(ugdwocl7 bs 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 6dh;jvkb6a a3 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 temperatuqn 0wl2a 0w zr)cdd3*dyz.t 9bre 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 kzy g4eywt5l2s:gs0( played when the speed of sound in air is 340 m/2tw l50gks yge:(4 yzss. 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 leny3pp fi 7-v-dlgth: one is open and the other is closed on one end. If the fundamental frequency of the open pip-i l3f7 ypd-vpe is 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(j/ kv6+qkvo/1 iurk5dfj yt gv;a-/p each emit a frequency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back5;(ri1//-fuav vvjkgqd j+k po6 ytk/ 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 drivej4hx6 a3xtk5g n by the same frequency 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 speaker? (The sound speed is 340 m/s.)j6x5htxkag 43

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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. f) y .bdjk4mytawhp(4 *oa*e( 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 tunclxnqdfr6)t:.ja dwtvr0+ ja360: vxe the frequency of a musical instrument. If thjjnqdxt6v +rldav t )030fx ::aw cr.6e 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 r :uut9 9j-9qzyqwgo 9:bxb; ahespectively. What beat frequency is heard when the horns are sounded on a day when the velocity of sound is 340h:ogbxaujy- 99u 99qwt :bqz; 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);lxd o:q7wpl found to produce a beat freq q p;7d:oxwl)luency 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-Hhon pj e1,kk6) 3+;rkw.swntj v.7 om4w myst/z sound source at twice the speed of sound. The mkv)ew.3;k o s,t1w/mr +7j.hs ynt wokj46npobserver 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 frequenoc6vfmib1)5, r pd6 l+uuurk9 cy of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The obselmi6pdbru)u+ 51u, kv6rfc9 o rver 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 movesj9-9kg lp: h)frgmr+w +gy/ie with a speed of 30 m/s away from the sourej/hyk-r gpr)gi l++:9 f9mw gce, what is the frequency 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-Hz2sce uba0j :xi1:s 2kuze5 sy, siren. 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 whoc:bs :yae ,0suxe5 22kiju1zs 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 hearrk.+u,skav g 82 q, hrgh)da-td by a 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/s.ht r, )gq.h+,askagu8 d vk2-r

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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 towardn5lwv(m z7tu-wslcc57 yn3(c you at 120 km/h. The train blows its 400-Hz whistle. Take mwc5cul(tl7 -y vwn (nc57zs 3the 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 120 km/h toward a stationary train. The t ;1*bmhi(;ewib jdk- drain blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequenc be-m;jw;(*ihdibk d 1y 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 f pki8e9spa 0,erom you at 120 km/h. The train blows its 400-Hz whistle. Take p es pe08,ika9the speed of sound 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. sidz +4 3omy/qpd3vr- It blows its whistle, and you hear a tone of 400 Hz. Take the speed ofv43pqrmi y/3+szod-d 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 500e+,odpntx/a: Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer ifx,pe +/a ndot: 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 Hzx(rh kb rju,w2bg.j06. Assume the speed 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 sp.kj0whrxg2(u r6j, bbeed 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-kHzk hzz:*8/; p/t/dfjt,pii az i signal is sent out, and a 42-kHz sdkzip iip;/8z* af:, ht /t/jzignal is returned. 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 j,1vm/*aq7uz e-i6efgh6 c vl 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 is the half-angle fbw;2p (u2 lnuof the conical shock walp(w n2u;f2b uve 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 States to Europe with a Mach num5/ r1fmqei tljh4a(3wber of 1.05 where the air temperil/tj5raq( ewh3 1m4f ature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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