Questions
A black body is at . It emits energy at a rate which is proportional to
a
(727)2
b
(1000)4
c
(1000)2
d
(727)4
detailed solution
Correct option is B
Amount of heat energy radiated per second by unit area of a back body is directly proportional to fourth power of absolute temperature.According to Stefan's law, E ∝ T4or E = σT4where σ is a constant of proportionality and called Stefan's constant. Its value is5.67 × 10-8Wm-2K-4Hence E ∝ (727 +273)4 E= ∝(1000)4Talk to our academic expert!
Similar Questions
For a black body at temperature 727°C, its radiating power is 60W and temperature of surrounding is 227° C. If temperature of black body is changed to 1227°C, then its
radiating power will be :
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