A point source is kept at the center of a spherically enclosed detector. If the volume of the detector increased by 8 times, the intensity will
Text Solution
Verified by ExpertsThe correct answer is:
C
For a point source, intensity is given by 
where 
is power and 
is distance.
If the volume of the spherical detector increases by 8 times, then 
, giving 
.
The new intensity is 
.
Therefore intensity decreases by 4 times.
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