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2 11 When the sun is directly overhead the surface of the earth receives 14...

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2 11 When the sun is directly overhead the surface of the earth receives 14 x 10 W m2 of sunlight Assume that the light is monochromatic with average wavelength 500 nm and that no light is absorbed in between the sun and the earth s surface The distance between the sun and the earth is 1 5x 10 m a Calculate the number of photons falling per second on each square metre of earth s surface directly below the sun b How many photons are there in each cubic metre near the earth s surface at any instant c How many photons does the sun emit per second

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