The intensity of heat radiation by a point source measured by a thermopile placed at a distance d is I, If the distance of thermopoile is doubled then the intensity of radiation will be
A
I
B
2 I
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
I ∝ for point source.
= 
= 
⇒ Ι ' = 
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