Question
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
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 620 nm, determine the number of photons per second per square meter that reach the earth.
answer in photons/s*m^2
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Cambridge International AS And A Level Physics Coursebook
Authors: David Sang, Graham Jones, Gurinder Chadha, Richard Woodside
3rd Edition
1108859038, 978-1108859035
