If the absolute temperature of a blackbody is increased by a factor of 3, the energy radiated per second per unit area does which of the following
A. Decreases by a factor of 81
B. Decreases by a factor of 9
C. Increases by a factor of 9
D. Increases by a factor of 27
E. Increases by a factor of 81
(GR0177 #35)
Solution:
Blackbody radiation: u = σT4
Thus, if T increases then u (energy) increases
(A) and (B) are FALSE.
The ratio of energy radiated is
Answer: E
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