To save the Earth, the surface of the Earth has been covered by silver foil. The foil has a albedo of 0.9. What is the flux density emitted from the surface of the Earth (assume temperature of 50 deg C)?

So I thought I could use Stefan Boltzmann law and just plugg in my values and got 569, but this is not correct. What I'm I missing?


1 Answer 1


In your calculation, did you use albedo correctly? Remember, albedo is the ratio of reflected radiation to total radiation, and 1-albedo is the ratio of absorbed radiation to total radiation.

Edit: Make sure you are plugging the numbers in correctly too.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.