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Monochromatic light of wavelength 3000 Å...

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

Text Solution

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`l=(nhc)/(lambdaA)xx1/t` (Intensity is energy crossing per unit area per unit time )
`n/t=(l lambdaA)/(hc)`
`=(150xx10^(-3)xx4xx10^(-4)xx3xx10^(-7))/(6.6xx10^(-34)xx3xx10^8)`
`=9xx10^13` per second
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