Question

A small-blackened solid copper
sphere of radius 2.5 cm is placed in an
evacuated chamber. The temperature of
the chamber is maintained at 100 ºC. At
what rate energy must be supplied to the
copper sphere to maintain its temperature
at 110 ºC? (Take Stefan’s constant σ to
be 5.76 × 10-8 J s-1 m-2 K-4 and treat the
sphere as blackbody.)

Answer 1

Answer:

A small-blackened solid copper

sphere of radius 2.5 cm is placed in an

evacuated chamber. The temperature of

the chamber is maintained at 100 ºC. At

what rate energy must be supplied to the

copper sphere to maintain its temperature

at 110 ºC? (Take Stefan’s constant σ to

be 5.76 × 10-8 J s-1 m-2 K-4 and treat the

sphere as blackbody.)