The energy flux of sunlight reaching the...

The energy flux of sunlight reaching the surface of the earth is `1.388 xx 10^(3) W//m^(2)` . 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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`4xx10^(21)" photons/m"^(2)s`

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