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EAMCET Engineering 2007 Solved Paper
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© examsnet.com
Question : 20
Total: 160
A black body radiates energy at the rate of
E
watt
∕
m
2
at a high temperature
T
K
. When the temperature is reduced to
(
T
2
)
K
, the radiant energy is
E
2
2
E
E
4
E
16
Validate
Solution:
According to Stefan's law, or or
E
∝
T
4
E
2
E
1
=
(
T
2
T
1
)
4
E
2
E
=
(
T
∕
2
T
)
4
=
(
1
2
)
4
E
2
=
E
16
© examsnet.com
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