Monochromatic light of wavelength `3000 Å` is incident on a surface area `4 cm^(2)`. If intensity of light is `150 m W//m^(2)` , then rate at which photons strike the target is
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` I = (nhc)/(lambda A) xx (1)/(t)` (Intensity is energy crossing per unit area per unit time ) ` (n)/(t) = (I lambda A)/(hc) = ((150) xx 10^(-3) xx 4 xx 10^(-4) xx 3 xx 10^(-7))/( 6.6 xx 10^(-34) xx 3 xx 10^(6)) = 9 xx 10^(13)` per second
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