Wednesday
April 16, 2014

Homework Help: physics

Posted by PLEASE AND THANK YOU on Saturday, April 6, 2013 at 1:31am.

Light is shining perpendicularly on the surface of the earth with an intensity of 680 W/m2. Assuming that all the photons in the light have the same wavelength (in vacuum) of 478 nm, determine the number of photons per second per square meter that reach the earth.

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