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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 sp 9iha9b ta6meq5p3(htatement?

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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 fastd7(+y( fpboux: utsj;est 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 rodhmz -1qg3 (vxi?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the temperature o*u khn ((fc1xxf the air increases, what happens to the velocity of sound? (Assume that all other factxu1cx* fh (kn(ors 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 sound throule q 3-*yz-8w;ffso xecn0dg;gh air nf8 ef-z;gyl0esod c ;w*q-x3is

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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 400vr+2 1(nhvr ni0rby0o Hz sound, the wavelength of a 200 Hz sound in air +i2nb0vo1yhr(rr n v0 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 thanbh0lx vs7be(wbp0zo 0n) qk0kzv0 u:0 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 frequenl -sh ff;1 n2xu1i+qvwcy 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 us:-sco-hok);s;3z kzhy.)r lpm; r wuniformly in all directions. If you move to a point twice as faroorrhs- );.zmsw)hc-: zsk ;3p; l yuk away from the 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 p./ly/ y zcask zj-o x.mwr0n78roportional 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 so75w7 cldnau)p9 n:w kn amo7h-urce is I. What is the intensity at a distance 2d f mn-wa97ucan lwdonp )k7 :h75rom 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* yo+ lvpqrf(w ./t ckc+q4m6u sound source that is radiating equally in all directions. What h+y r+4q c* w(v .tcupqfm6o/lkappens to 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 sound source that is usf e:dwr-/cm sn ww-t. ,m/*dradiating equally in all directions. What happens to the intensity level of the sound? If /dm-m:/se uwtw- sdcn ,w.r*t 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 followin)ttwmwy n2.6eqsa g452f -vgr g 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 tolpuf sh-nsoo+d4g f1a 9 l0j62ne. What characteristic of the 6l1fd0n9og-s s h ujofp24+alsound 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 musicap18l zvldi7 pkgy5 9.fl 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 /m c(jv8syhc8 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-t) st+hh0( 8m r1zf9 qakezvr 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 -64gh7eba4xi,o41,vw2m nkpjtk gar

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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 generated4f9g10xt ycr r ;qfut+ by the guitar as a result of this vibration. What do these two wavrqutx0 4y1 9+;rcgtff es 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 o50zjloz(( ahub qv6+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 tr2 h/i*596wuutderhzaud a 2+he three lowest tones produced by this pi2eaa u9zwt*6ud 2hudr/5 i+hrpe?

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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 Hci0y f)muvrsa +9/w+zz. Which one of the following frequencies will not resonate i a)wsyz/fc0vu 9r++imn 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. ;3koz35ui7/p i .yt*o bgrdk iWhich statement i3dgib;7tku*o yp io3r5zi/ k.s 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 enidytoo3p1*ocv89h x 6 d 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 wavelengths of the thre; +0pbm hg r8iboku(uw+r xe7-e lowest tones produced by th h -mkge+ou;7r(ix80+ rubpwbis 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 ofsha /tu/)u(tr1m yzx9 length L is 200 Hz. Which of the following frequencies will not resonate ixm)yuu /a(h1 t t/r9zsn 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 s63 c)r.ylf, 9 q jhx2tkws:hsits fundamental frequency. Which statement is corrects6):lxsc3qtw9sr k. h2j h ,fy?

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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. Each sptdfltp4:, k2weaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 t:2d4wl tf,kp 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 bbjf b7:6i2v jvdf /l1oeats, the 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 particular beat fx,lyc *xq1w m l-rq7-mrequency is heard. What happens to the beat frequency if the frequency of one of the tones is increl- x1cr,wy-*lqm7q m xased?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift explainyk 76ch,vh0la 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 s r;qwf3g3nz6 observer. The frequency heard by the observer is3 ;rnqgs 6wz3f

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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 ct+8l*3hb+.kzxr;jc;n gpz j the observer is zjl zx8*.j;+ 3htkbpgcrcn+;

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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-angle will daiprkw6 vgl0,j8a1rbg: )oi7 ecrease by a facto8 a1oil0aib g g r6v7wr:)kj,pr 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 sound of frequency 45 kHz in air is 352 m/s. Whatb.c-*d 6v4rogz;sv lnt 9h* tv is the air temperavro *zvs4;hd -*. vtctl g6nb9ture?

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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 in1+defvg)b rtvoka 76; 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 wh6v9)p6+rb 3e2g d 3ybptr08pz gjogyy ose echo reaches it 0.0250 s later. How far away was the object that reflected back+gv3p 9ydyrp t)g63yjpoz8b g er206b 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 temperkh)yser0 7(xrt 98bwl nza) g(iv h*t3ature 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; e*c0hv ozt qis::i0u lightning, the distance to the lightning strike is :e0:iiu*;0 o vtzshqcabout

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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 /2 v2*+qarya ojg-l7/d mzgpm 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 0xkw1j j;jchrhh) 63 khear the splash 2.5 s later. How deep is the well? (Ignore air re r;)1hjkjhcjx03k 6 hwsistance, 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 wave of fit3ypp8hriw e( y g,m16wv.f:requency 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 g7 n//djnhi 4)fgk: elat $23 \; ^{\circ}C$ 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 wi( i t(ybacu0p9qi)(3o6ern5 mgm8anrth 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 intensitbvhbqu /.8ni wb1*+an y 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 of the intensities of qd og+ .2( d9kp2holentwo sounds with intensity levels of 70 dhq gdepkn d (2.9olo+2B and 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 by 15 engines in a garage is 100 dB. What is the intensi0 p2oxxgfa 03oty level generatedx30o2 ao0xgf p 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 rvn;8;tze j pm3h h-9syadiating equally in all directionsvm3; pz hn-t;e hj89sy 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 ov4)d awhzi2c5 f 6.0 m from a source that is radiating equally in all directions iswic)4ahv5 2z d
$6.0 \times 10^{-10} \; W/m^{2}$. 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 powe e,l:4 x40-swxgu m vu: :um9kss/ordhr, which is assumed to be uniformly distributed in all directions. su d04:m-,s/lh oxk49: grew:uvmxus 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 mjd0r 2s 4wdgh5(/ zpz5.00 m from a barking dog. What would be the intensity level if two identical dogs very clmddwg 05zs4zpr j2h/( ose 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 is 60 dhtxyv,i8z u04bwa m) xd0u79qB. What is the intensity level (in dB) at a point 07vaty9w8qb zu,4 m dx)i 0hxu2.0 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 distg8*,ik n7xqvym +ka 2.8kwlsh ance wk8+sg. l8x k,k2wh* q7vnmiy aill 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 ofa*lnxa aruekz/ 5s,,)6fld6 y a complex tone has a frequency of 1200 Hz. What is the frequency of the fourzna /lle*kfxu5ysar, ) d a,66th 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. What is t zs 0rm30t:ta 9w /xhb0dkyc3fhe length of the piw x0fyr:ttdam/b93ch0 s03zkpe?

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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 resonuf to(n2nroiv7 p ,q/ y*6ru+date in an open pipe of length L is 400 Hz. What is the frequency of the ln uro rp*ud2(/qy6 on7,t iv+fowest 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. If the v;i7f/rowco g 0euo.q3 elocity of sound in air is 340 m/s, w7.wc0 ;3ou qfegoiro/hat 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 ter0 f7-wd7vk nbmperature 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 iq6u-rxv0 ob ,us 330 Hz. What is the freque,xuv0 o-rb qu6ncy 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 onetq 60wc8 yjgm1 end that will have a fundamental frequency of 60 Hz on a day when theyc6 jwmtq01g 8 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 where the temperatbwt)dix(*2d + ous 5zn(,ami0 y(weaaure 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 temperatur3 t(7i nrov(;9 wylxlm+ suhs)e 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 )0ikkzh9c9ituevja4( .z 2wwin air is 340 m/s. What is the fundtc 2ikai4j wk(vuzw0.) 9ze 9hamental 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 e38lz 1urwidyt(( (thh, qb6*vrv l/zthe other is closed on one end. If the fundamental frequency of the open pipe is 30rvtibz hv3e(,d1wlu *(y(t qrh6z 8 /l0 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 velocity o)0z*b,3 egl8cf ruyj ff sound is 340 m/s. How much farther back wou b0zyu8g) fc3ejf,l r*ld 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 driven by thej(un*u 7fne5q 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 qj*ufen 7(5nu 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. Wha vmn*)e +wh8y++vh wiit 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 musijl.g5 :4x zbnean f6l+cal instrument. If the tuner hears a bebnj .564llf n:aez+g xat 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 sos wpuq,oir)sdf98f ,k m2rb /7unds produced by two horns are 6 m and 7 m respectively. Wu d)i9of2sr,r/8 fkwqs,7pm bhat 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 violin stringn2wzu04cao8/hj 6 mz us on two violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is pla/8mw zuh z4jcoua0 n26yed. 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-Ht76nv 7) zpeobz sound source at twice the speed of sound. pt6v)eno bz77The observer 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 frev k (xun/-rfra**yzb,quency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a frequency r*vz (/*,r-ykxnufba 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. ,mx*eyl: xer2 If a listener moves with a speed of 30 m/s away from2e* xxrl:ym,e the source, 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-Hz siren. It i4 b8/rd (l2rgi 9stsxos traveling at 35 m/s on a day when the speed of sound through air is 340 m/ssr/l2i4d( 9 x8str bog. 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 b+j6 x spsv72iav oj;q)l 7wpm:0i f1lny a stationary observer when a train approaches with a spe vl7+mwsvlp7qpf) 1 0:6isij n2jaxo;ed 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 its 400-Hz whistl o 6r0huz)p..;tv (d6pgbyzjr e. Tavhzz.rpto60.u ; pgdj( b)6y rke 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 120 km/h toward a stationary 6*7z4b hhjbhl train. The train blows its 400-Hz whistle. Take th6bhh4j*blz7 he 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 km/h. Th32 crm31 x uzix8erkg,e train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do your me,2ik38xg3 zr1cux 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 1c1;inzejf c q9.7xs 4f20 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 actual frequency of the whistle?;4nf. jcf1ic 9e7szq x

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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. Assu jt6bv4y9jqv29ksv b 4me the speed of sound in air is 340 m/s. Wha j9k4y6qjs9 4vb2bvtvt is the frequency heard by an observer if 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 Hz. Assume the speed of sound in airdk 0om)))hgzd is 340 m/s. What is the frequency heard by an observer if the observer is approaching the trai)g)k o0hm)z ddn 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 o l w*.wysmr)ji.smd( 1f an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the spe1(jlw )is.rsdmw m*y.ed 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 thxm f .0s7wp5qo6k3fj1yc 2ua ye conical 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 Mach 1.4. What is the half-angle of the conical shocke3 nva aoi3x8asik :8+ wave fv8x+ o38:asn aaiie3k 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 United States to Europe with a Mach nw8 m -meq:9r:b ny-w tut53vclumber of 1.0w-mn-5cqe y8 3rvtu ml9bwt ::5 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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