17

Biology with MasteringBiologyâ„¢ (8th Edition)

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  MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question.  1) 
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A double slit  illuminated  with two  different  colors of  wavelengths  831 and    forms a two - colored  diffraction  pattern on a  screen  located    away. The  slit  separation is  36  wavelengths  of    light. (a)  What order  maximum  for    occurs near    from zeroth  order? (b)  What order  maximum  for    lies close to  this order? 
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1)  _______  A) 
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(a)  6  (b)  10 
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B) 
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(a)  5  (b)  3 
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C) 
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(a)  3 (b)  5 
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D)  (a) 2 )  
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Two radio  antennas are  130 m apart  on a north - south line.  The two  antennas  radiate in  phase at a  frequency of  3.6 MHz.  All radio  measuremen ts are made  far from the  antennas.  The smallest  angle,  reckoned  east of north  from the  antennas, at  which  constructive  interference  of two radio  waves  occurs, is  closest to: 
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2)  _______  A) 
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35° 
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B) 
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50° 
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C) 
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55° 
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D) 
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45° 
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E)  4 0    
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Two radio  antennas are  120 m apart  on a north - south line.  The two  antennas  radiate in  phase at a  frequency of  5.6 MHz.  All radio  measuremen ts are made  far from the  antennas.  The smallest  angle,  reckoned  north of east  from the  antennas, at  which  destructive  interference  of the two  radio waves  occurs, is  closest to: 
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3)  _______  A) 
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19° 
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B) 
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16° 
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C) 
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9.7° 
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D) 
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6.4° 
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E)  1 3    
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Two radio  antennas are  10 km apart  on a north - south axis on  a seacoast.  The  antennas  broadcast  identical  AM radio  signals, in  phase, at a  frequency of  4.70 MHz. A  steamship,  200 km  offshore,  travels due  north at a  speed of 15  km/hr and  passes east  of the  antennas. A  radio on  board the  ship is tuned  to the  broadcast  frequency.  The  reception of  the radio  signal on the  ship is a  maximum at  a given  instant. The  time interval  until the next  occurrence  of maximum  reception is  closest to: 
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This document was uploaded on 04/16/2010.

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