Monochromatic light of wavelength 3000, mathr | vedclass

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Question

(b) $\frac{n}{t} = \frac{{IA\lambda }}{{hc}}$$ = \frac{{150 	imes {{10}^{ - 3}} 	imes 4 	imes {{10}^{ - 4}} 	imes 3 	imes {{10}^{ - 7}}}}{{6.6

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$9 	imes 10^{13}/sec$

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(b) $\frac{n}{t} = \frac{{IA\lambda }}{{hc}}$$ = \frac{{150 	imes {{10}^{ - 3}} 	imes 4 	imes {{10}^{ - 4}} 	imes 3 	imes {{10}^{ - 7}}}}{{6.6 	imes {{10}^{ - 34}} 	imes 3 	imes {{10}^8}}} = 9 	imes {10^{13}}\frac{1}{{sec}}$

Monochromatic light of wavelength $3000\, \mathring A $ is incident on a surface area $4\ cm^2$. If intensity of light is $150\, mW/m^2$, then rate at which photons strike the target is

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