Question

The emissive power of a spherical surface is 1 Kcal 1 m2s at 400 K Diameter of the sphere is 10 cm .find the heat radiated by the sphere in 1 minute

Answer 1

Explanation:

We know that emissive power is given as: E=σT

4

T

4

=

σ

E

T=

5.67×10

−8

1500

=403.29K

Now, we know that radiation from the surface is given as E=σϵAT

4

E=5.67×10

−8

×4×π×0.05

2

×403.29

4

=47.15J