(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.

Explanation

Given , frequency , `v=6.0xx10^(14)W`
Power of each photon is
`E=hv =6.63xx10^(-34)xx6.0xx10^(14)`
`=3.98xx10^(-19)J`
Let N be the number of photon emitted per second by the source Then,
P = NE
`impliesN=P/E=(2.0xx10^(-3))/(3.98xx10^(-19))`
`=5.0xx10^(15)` photons/second.