A black body at a temperature 400 K placed in an enclosure at 300 K has cooling rate 'r'. If the temperature of the body is 800 K and placed in the same enclosure, the cooling rate will be approximately
(1) 3r
(2) 16 r
(3) 23 r
(4) 8r
Answers
Answered by
3
Solution
Emissive power,
E
=
σ
T
4
E
r
=
E
2
E
1
=
T
4
2
−
T
4
e
T
4
1
−
T
4
e
=
800
4
−
300
4
400
4
−
300
4
=
22.94
E
=
22.94
×
r
Answered by
2
Answer:
option 3)23r
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