#### 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 : Option 1) 225 Option 2) 450 Option 3) 1000 Option 4) 1800

As we learnt in

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(For blackbody)

According to question

Then

or P2 = 4P1 = 4  450 W = 1800 W

Correct option is 4.

Option 1)

225

Incorrect

Option 2)

450

Incorrect

Option 3)

1000

Incorrect

Option 4)

1800

Correct