A sphere and a cube of same material and same volume are heated up to same temperature and allowed to cool in the same surroundings. The ratio of the amounts of radiations emitted will be
A
1 : 1
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Q = σ σ A t (T 4 – T 0 4 )
If T, T 0 , σ σ and t are same for both bodies then 
..(i)
But according to problem, volume of sphere = Volume of cube ⇒ ⇒ 
⇒ ⇒ 
Substituting the value of a in equation (i) we get
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