The total radiative power emitted by spherical blackbody with radius R and temperature T is P. If the radius is doubled and the temperature is halved then the radiative power will be.
A
P/4
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B
P/2
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C
2P
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D
4P
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Solution
The correct option is AP/4 Radiative power emitted P=σeAT4
where A=4πr2 is the surface area of the body, σ is Stefan's constant, T is the temperature and e is emmissivity of black body.