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AP EAMCET Engineering 2018 Apr 24 Shift 1 Paper
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© examsnet.com
Question : 95
Total: 160
The temperature of a spherical black body is inversely proportional to its radius. If its radius is doubled then the power radiating from it will be
Doubled
1
4
times of initial value
Halved
4 times of initial value
Validate
Solution:
The expression of the power radiating from a black body is,
P
=
σ
A
T
4
P
=
σ
(
4
π
R
2
)
(
k
R
)
4
(
As,
T
∝
1
R
⇒
T
=
k
R
)
P
∝
1
R
2
From above expression, when radius is doubled, the radiating power of the sphere becomes one fourth.
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