- #1

- 259

- 11

- Homework Statement
- A spherical shell with a radius of R surrounds a star with temperature T.

Find the amount of energy that the shell from the star in an hour.

- Relevant Equations
- [tex] P=\sigma*A*T^4 [/tex]

I don't understand how this can be solved.

The official solution was:

[tex] F=\sigma*T^4 [/tex]

[tex] E=F*4\pi R^2*60*60 [/tex]

This doesn't make sense to me, as it seems to imply that the energy that the black body radiates depends on the radius of the shell. For a very large shell the body will reflect "infinity" energy.

Can someone please explain this?

Thank you.

The official solution was:

[tex] F=\sigma*T^4 [/tex]

[tex] E=F*4\pi R^2*60*60 [/tex]

This doesn't make sense to me, as it seems to imply that the energy that the black body radiates depends on the radius of the shell. For a very large shell the body will reflect "infinity" energy.

Can someone please explain this?

Thank you.