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Solar radiation falls on Earth's surface at a
rate of 1900 W/m².
Assuming that the radiation has an average
wavelength of 580 nm, how many photons per
square meter per second fall on the surfaces?
The speed of light is 3 × 10° m/s and Planck's
constant is 6.62607 × 10-34 J. s.
Answer in units of photon/m² · s.
2

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