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Grade: 12th pass
The amplitude of light depends upon the distance of the point from the axis of a cylindrical source as follows :
one month ago

Answers : (1)

suresh kumar
37 Points
the example of cylindrical source is the line of light. it emits cylindrical expanding wave fronts.
intensity I=P/area ,
P is the power of source which is constant
Hence  I1/area
area of cylinder , a=2πrh  ,  (h=height of cylinder) ,
therefore intensity of wave ,
  I1/2πrh ,
which implies I1/r
we have , IA2  (A= amplitude)
we get ,  A2 1/r ,
Hence, last option is correct
19 days ago
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