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The energy flux of sunlight reaching the surface of the earth is 1.388 10 W/m. How many photons (nearly) per square metre are incident

The energy flux of sunlight reaching the surface of the earth is 1.388 10 W/m. How many photons (nearly) per square metre are incident on the Earth per second? Assume that the photons in the sunlight have an average wavelength of 550 nm.

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