Question

(i) Mono chromatic light of frequency `6.0xx10^(14)Hz` is produced by a laser. The power emitted is `2.0xx10^(-3)W`. Estimate the number of photons emitted per second on an average by the source.
(ii) Draw a plot showing the variation of photoelectric current versus the intensity of incident radiation on a given photosensitive surface.

Answer 1

Energy = hv
On an average, number of photons emitted per second = Power energy of one photon
On putting the vaues, we get
On an average, number of photons emitted per second `=2xx10^(-36)xx63xx10^(-34)xx6xx10^(14)`
(ii)