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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?

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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.

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