11.5 The energy flux of sunlight reaching the surface of the earth is 1.388×103 W/m2. How many photons (nearly) per square meter 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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    Payal Gupta | Contributor-Level 10

    4 months ago

    11.5 The energy flux of sunlight, ? = 1.388 ×103 W/ m2

    Hence power of the sunlight per square meter, P = 1.388 ×103W

    Speed of light, c = 3 ×108 m/s

    Planck’s constant, h = 6.626 ×10-34 Js

    Average wavelength of photon, λ = 550 nm = 550 ×10-9 m

    If n is the number of photon per square meter, incident on earth per second, the equation of power can be written as

    P=nE or n = PE

    We know E = hcλ

    Hence, n = Pλhc = 1.388×103×550×10-96.626×10-34×3×108 = 3.84 ×1021 photons m2 /s

    Therefore, every second 3.84 ×1021 photons are incident per square meter on earth.

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