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AP and TS EAMCET Engineering Model Paper 15
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© examsnet.com
Question : 108
Total: 160
A spherical black body of radius r radiates power p. Its rate of cooling is directly proportional to
r
r
2
1
r
1
r
2
Validate
Solution:
d
θ
d
t
=
σ
eA
(
T
4
−
T
4
)
ms
d
θ
d
t
∝
A
m
⇒
d
θ
d
t
∝
r
2
r
3
⇒
d
θ
d
t
∝
1
r
© examsnet.com
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