NEET | 2017Heat TransferEasy

Question

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

Options

A.

450

B.

1000

C.

1800

D.

225

Solution

P ∝r2 T4
⇒  P1P2=r1r22T1T24
P2 = 1800 watt

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