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AP EAMCET Engineering 2012 Solved Paper
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© examsnet.com
Question : 30
Total: 160
Power radiated by a black body at temperature
T
1
is
P
and it radiates maximum energy at a wavelength
λ
1
. If the temperature of the black body is changed from
T
1
to
T
2
, it radiates maximum energy at a wavelength
λ
1
2
. The power radiated at
T
2
is
2
P
4
P
8
P
16
P
Validate
Solution:
We have,
P
∝
T
4
∝
1
λ
4
⇒
P
1
P
2
=
(
λ
2
λ
1
)
4
P
1
P
2
=
1
16
⇒
P
2
=
16
P
1
=
16
P
© examsnet.com
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