For a black body at temperature 
, its radiating power is 60 watt and temperature of surrounding is 
. If temperature of black body is changed to 
then its radiating power will be
Text Solution
Verified by ExpertsThe correct answer is:
B
Radiating power of a black body
where 
is known as the Stefan‐Boltzmann constant, 
is the surface area of a black body, 
is the temperature of the black body and 
is the temperature of the surrounding.
(i)
In the second case, 
and let 
be the radiating power.
(ii) From (i) and (ii) we have
W.
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