Q.

A spherical black body with a radius of 12 cm radiates  450 W power at 500 K. If the radius were halved and the temperature doubled, the power radiated in watt would be:

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a

225

b

450

c

900

d

1800

answer is D.

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Detailed Solution

P = σ AT4P2450=1×244P2=1800 W
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A spherical black body with a radius of 12 cm radiates  450 W power at 500 K. If the radius were halved and the temperature doubled, the power radiated in watt would be: