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A photo sensitive surface is receiving l...

A photo sensitive surface is receiving light of wavelength `5000Å` at the rate of `10^(-7)J//s`. The number of photons received per second is : (Given : h = `6.626xx10^(-34)J-s, C = 3 xx 10^(8) m//s`)

A

`3.5 xx 10^(9)`

B

`2.5 xx 10^(11)`

C

`3 xx 10^(18)`

D

` 5 xx 10^(32)`

Text Solution

Verified by Experts

The correct Answer is:
B
`E=n(hc)/(lambda)`
`10^(-7)= (nxx(6.626 xx 10^(-34)Js)(3xx 10^(8) m//s))/(5000xx10^(-10)m)`
` n = 2.5 xx 10^(11)` photons per second
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