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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 statemc5cw x4w c:ko,hf0 ;ytbhp 4,oent?

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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 conductq*yvq*y qn nh+w:) xao1i3gmt2 ek2)fed 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 stee1mec*j0m. wpv 6cklt w h97o(,a ct6ntl 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 happens to the velocj ir0 .6ws qe4ty /)w:lpnmd5o(ixg5s ity of sound? (Assume that all other factom w5e x )/d :lpy5j40rsg.qiot isw(6nrs 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 40ciyh *,g5m sbd.nq .d-0 Hz sound, the velocity of a 200 Hz sound through,5dgsqbin.c.* hyd-m air 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 o4zoc6 1v(twyqolx2r 5 f a 400 Hz sound, the wavelength of a 200 Hz sound in aiw1o6 orzl 5tycv (x4q2r 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 g y,(cp ve0)k8fh 0u-u pxn*3r1 wvpotcreater 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 frequencyj(,v4awf we .sx;rb1l 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 dy i0aqia6 3 4(gq:ztweirections. If you move to a point twice as far away from the source, the frequency of the sound wilaz6g w ytiq40:(aqie3l 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 proportional jd9s/ d im0vp4a*lw*ykes-h 5to

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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 dista j9,o3*ujdwcm:4s obl nce d from the source is I. What is the intensity at a distance 2d from th4wj 3j:o cd9o*bu,msle 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 radiatiny995csms - qos (pcd:i/op*wkg equally in all directions. What happew(ics/* pk-ops9: 59cdoymq sns 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 sou zay 2qs)ygw2si( 0.o v,bj3zmnd source that is radiating equally in all directions. What happens to the intensity 0sovi).yzb3q az s2, mwj(2g ylevel 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 tsjo:v+nf1 :rwvb +qp eh5ht.-.za5g 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 faub/d582 i/udn5 wmzel w,p9 a speaker emitting a pure tone. What characteristic of the sound increasesb/dw/f u u 2en,pmi9 ld5a5zw8?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudnz4chyu-a85 ) ac qcodzv1g6o+ ess" of 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 m: hzmy 0uwa-jk(b:6/szkqny4usical 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 intody/i kmm*3t :o 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 wavezyd5 b(v0 h7 7k3rf;jva/iihgs 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 wave on a guitar string and the soundn/ , iwms:7ri:+,xpr4jhc9pd8ccqc k wave generated by the guitar as a result of this vibration. What do these two wavqcs i:pr8+ c 9xc c4/w:nmi7dhjkr,p,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 both zt-du5u/;di p 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 ofbn7 m)x a7vtuk /sv-u* length L. What are the wavelengths of the three lowest tones produced by thisub *xasnv)-mv u/kt77 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. Whichh7gxgzst g7w 1rwz 23nz9g-3,vh htj5 one of the following frequencies will not resonateh3- 35g9shw,7zzgz n2 tv rhgwxjtg71 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 frequemsi n ti-t*66 8mgs:enncy. Which statement mtgsm6:te 6n8* iisn -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 other, thermwjt z9qe/:8af +x g2je

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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 leng e8zp; d.:wzobth L. What are the wavelengths of the three lowest tones produced by this pipe?8od e:zp b;.zw

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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 lhy(3 6es )l kftw.t.rcength L is 200 Hz. Which of the followi y ke.st ft6wr(h.3c)lng 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 tv0a1kgclhn(1 ugh-, is resonating at its fundamental frequency. - cah(kugtn1l1g, 0hv Which 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 driven by the same sourhvhc wt5 94z:wce. Each speaker produces a tonevw5:4wht9chz 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 wavesr13kekc ya/u7 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 frequency i*+exsaw xb*z6 s heard. What happens to the beat frequency if the s+ xx*6bwz*aefrequency 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 explains 8mqwc*+u ;vt:yu.oqm

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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 l- ;j fvofda0:a stationary observer. The frequency heard by the observer l;o-0 v:jadf fis

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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 fr-s4bouofr8ppsm1+8 nom a stationary observer. The frequency heard by the observ +m4oposn8 rus8fb-1 per 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 ;4iqab3rq 4nuh3h-t lits MACH-speed, its half-angle will decrease by a fa 3ru3hn;i4laq -htbq 4ctor 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 kH.usk oc.me;, k.cbxgs x yct; (,eb*;dz in air is 352 m/s. What is the air tb ;cs(s, ;k *,bg.cyo. k etdc.xuem;xemperature?

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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 oflr:.rkfe)h/8 ta7as y4 y6jfo the 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 who5zr) *scq0 ykh(xqe9ui6e 9tnse echo reaches it 0.0250 s later. y6izth9us eqknq ec59xr(*0) How far 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, 56j*q6-ela; tb dmh g0 jhnorlhz77,wand hear 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 see i 9cfxj)xx j./m7xoq2o(c/oqing a flash of lightning, the distance to the lightning stri92.( xm /j/i)ofoojxcc7 xqqxke 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 temp,gpb;e4h oj:1nu6fk serature 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 thfz)6 l13oae jpe splash 2.5 s later. How deep is 3z1j 6)aefol pthe well? (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 of a sound wave of frequency 500 Hz 9w r:tffj. ;dqis

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound traveling in aixc+ewi7k (y9-9 .h u jjd4ue14xv6au8jeoydxr 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 level of a sound with in/ yg-qy4qptgsi. *yj q --w4wutensity $10^{-3} \; W/m^{2}$?

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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 9a ixd*yxq3oh d8y2ha/). kaq 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 two sounds with intensity levels of pywx/t qj5;(mrm,9ny 70 dB and 40 dwm/m y(x5; r jpqnty9,B?

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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 intensit 1ii+cz4 :5u uidmrds3mh2w ;vy level generaw5u +i ii; hscvmu2d:4r 3d1zmted 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 distancemb -:fm f33 qwfsa5dqef(3xv2 of 6.0 m from a source that is radiating equally in alle fv3xfm:fm qa 2 qdf5w33(-sb 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 /2i -1svoqtcdjo 0vh 2from a source that is radiating equally in all diro -/2d jc0h1ivqvs2toections 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 p 0y,:+sx65jmn:ma) m4 rsmfr1gndc jb ower, which is assumed to be uniformly distributed+yfg s rb)4jx0s:dm5m1mrj: n, na6mc 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 is 65 dB at a distance 5.00 m from a barking dog. What wyej/wl.spvq+h :t a.2ould be the intensit h /l:ayvpwj+t2sq.. ey 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 stg5li6s,tt;,pjj:h4 ng .b gjound source the intensity level is 60 dB. What is the intensity level (in dB) at a pl.tj6g, ,4jhgjs b tg:ipn5;toint 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 pointbtqatn,/z;81 qdyx6 e0xd2uw source is 95 dB. At what distance wil qtqxd 8;w/,0x ze6db1ta2 nuyl 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 fr)9mj6 k x/ 3f4xbz6sf ebg f4;jex.ofiequency of 1200 Hz. What is the frequency of the 9z/if ofb6x xem4ffj63 )ksx; .jg e4bfourth 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 pipediev* 1 ien-xo03m .:oa1mucoucdqd9lc9 7i1 is 900 Hz. What is the length of the pip miuo- 1dd9 1v.doimcni1uocl09e:aeq3c 7x*e?

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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 ihfw6rqlfo+ gg39go-y :kua5 1a- 4ltwn an open pipe of length L is 400 Hz. What is the frequency of the lowest tlwfalot- - 35 wf :+y9u4rgg1a6gkohq one 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 5y ufzo ;qt,q2velocity of sound in air is 340 ;u2f ozq,qyt5 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 temperature iswx(l lp ex8 ,l4z(wc4v+5mymx $20 \; ^{\circ}C$. 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-kh)qs3: .md xa,e+8o dnue lt a pipe closed at one end is 330 Hz. What is the freq :stud.l h+3ndk m,qae-8oe)xuency 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 one end that willhnkdf891z, rfn3 rnl2 have a fundamental frequency of 60 Hz on a dr2l 8k9n d,fzhnrf n31ay 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 room where twt9,m ;fdo +h;/wmfim q 1+xwahe 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 temperature is tp s4lzbp:+s,$20 \; ^{\circ}C$. 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 inyry,k*f ;c8i h air is 340 m/s. What is ti,yrk; cyh f8*he 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 open and the ot iwzthifm 9j*a*u-;+kher is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of the closed pi-j i*zwa mht*+9;ifkupe?

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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 vqmnf o. yg)w)0elocity of sound is 340 m/s. How much fa nq0ymo)) wf.grther back 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 driven by t-2 ex .qg;zfw)j 3wrakhe 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 mw-. zgxrqjk;) faw2e 3/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 frequencceey r6m zs5;xo2/4oq ies of 440 Hz 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-v86mi 2 nn2dmw ys4f+5pw/fm. aobq 0zHz tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequenc5wmsv2aiwfq+zp mo6.n4d08 b2ym/ nf y 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 h x lioa* ):s(pd*y9orrorns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when(p ys*)l da*9r:oxor i 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 t e6q 8vho gy3j9,)netto produce a 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 sahev3ng ,otj9 y8q6)teme 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 stx;j e,y(0rv4hky.uf9l g9y.a krh t:yationary 1000-Hz sound source at twice the speed of sound. The observer hkyf l(yv urg ;:r9e4jh0khx, .yya.t9ears 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) approaches a station3 9lj:cfp3k auary observer at f: k9p3 ca3uljone-half the speed of sound. 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 frequencyvd/ *njbr g9ptt+cfd( le+m,2 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 3dg +( jv+pt*n/9rmlc bd2,fet40 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 when the b .m)u 01n(1vdzmci/wx xb )cjspeed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the rcm)/m(x110cv)bzxw j ndbui .oadside. 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 a stationary observer when a train appr5oopu tb*k )akt4.i 6ooaches with a speed of 30 m/s. The frequency of t iuk5opt) to6o.*4k bahe 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 fov-a 8d2r3ga1f6jlve. Take the speed of sound to be 340 m/s1j f o36 g8ldv-v2araf. 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 train blows its 400a)pms q. b/rc0-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do ap/mrqcbs). 0 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 t2bq zc7hb tl*;uv843 zhx0 vg120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hearh qbbv08 vz2xczt;*34g7t l uh?

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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 0nu(w. 9 lomzuw*cpz*you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency of zuz09um (*w o c*wpl.nthe 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 inarc b:2l8xi1a air is 340 m/s. What ia1ic xr:82alb s 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 airt6kyz *sy5 bg,fe5t w* is 340 m/s. What is the frequency heard by an observer if the observer is approaching theys5ktey5g*6* wtf, zb 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 iqdre g,m +t 60t/2wo4jc wyf;gs sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the object tw /t, r6m4;wefco gq20yj+dgmoving?

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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 supff og/);mfi+b ersonic 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 ,tl*if nw3k g/half-angle of the conical shock wave forgw*n t li,3k/fmed?

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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 thbtxx1p w8pc 0/ o(pu9de United States to Europe with a Mach number of 1.05 where the air tp1 xw8pb0 (p9 /coxdutemperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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