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Questions  >>  CBSE XII  >>  Physics  >>  Wave optics
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The energy flux of sun light reaching the surface of the earth is $1.388 \times 10^3 w/m^2$. How many photons (nearly) per sq.m are incident on the earth per sec ? Assume that the photons in the sunlight have an average wave length of $550 \;nm$

$\begin{array}{1 1} 3.84 \times 10^{21} photons /m^2 \\ 3.84 \times 10^{20} photons /m^2 \\ 38.4 \times 10^{21} photons /m^2 \\ 38.4 \times 10^{21} photons /m^2 \end{array} $

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