Questions
Two perfectly black spheres A and B having radii 8 cm and 2 cm are maintained at temperatures and respectively. The ratio of the energy radiated by A to that by B is
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Correct option is B
Rate of energy radiation Q=σAT4=σ4πR2T4∴ QAQB=RARB2TATB4=822.4008004=16116=1Similar 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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