Question

A solid spherical black body of radius r radiates 450w power at 500k if the radius is halved and temperature is doubled the power radiated in watt would be

Answer 1

Radiated power by black body p=Q/t

P=AT^4==r^2T^4

P1/P2= ( r1/r2)^2(T1/T2)^4

450/P2=( r/r/2)^2(500/1000)^4

450/P2=4×1/16

P2=450×4

=1800watt

Answer 2

All objects emit electromagnetic radiation according to their temperature. A black body is an idealized object that absorbs all electromagnetic radiation