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Monochromatic light if wavelegath 3000 A...

Monochromatic light if wavelegath 3000 A is incident on a surface area ` 4 cm^(2)` . If intensity of light is ` 150 mW//m^(2)` , find the rate at which photons strike the target .

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Rate at which photons strike the surface
`=(IA)/(hc//lambda)=(6xx10^(-5)J//s)/(6.63xx10^(-19)J//"photon")=9.05xx10^(13)"photon"//s`.
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