The radiation pressure exerted by a 450 W light source on a perfectly reflecting surface placed at 2 m away from it, is
A
Pascals
B
0
C
Pascals
D
Pascals
Text Solution
Verified by ExpertsThe correct answer is:
D
First, the intensity 
at a distance 
from a point light source spreading its energy isotropically is given by
Where 
So,
For a perfectly reflecting surface, the radiation pressure 
is given by
where 
is the speed of light.
Substituting the value of 
:
Calculating the final value:
which is approximately 
.
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