If the temperature of the sun were to increase from T to 2T and its radius from R to 2R, then the ratio of the radiant energy received on earth to what it was previously will be-
Text Solution
Verified by ExpertsThe correct answer is:
D
From Stefan law, the energy radiated by sun is given by. 
, assuming 
for sun.
In Ist case, 
In 2nd case, 
The rate at which energy is received by earth is,
where 
area of earth
So, In Ist case, 
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