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Monochromatic light of wavelength 3000 Å...

Monochromatic light of wavelength 3000 Å is incident normally on a surface of area `4 cm^(2)` . If the intensity of the light is `15 xx 10^(-2) W//m^(2)` . The rate at which photons strike the surface is `K xx 10^(13)` photon/s. The value of K is _________.

Text Solution

Verified by Experts

The correct Answer is:
9.09
Rate at which photons strike the surface `= (LA)/(hC// lambda) = (6 xx 10^(-5) J // sec)/(6.6 xx 10^(-19) j// "photon")`
`= 9.09 xx 10^(13)` photon /second
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