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  4. When green light is incident on a metal , photo electrons are emitted by it but no photo electrons are obtained by yellow light . If red light is incident on that metal then

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Q. When green light is incident on a metal , photo electrons are emitted by it but no photo electrons are obtained by yellow light . If red light is incident on that metal then

Dual Nature of Radiation and Matter

Solution:

Wavelength of Red $>$ Y ellow $>$ Green
(learn the pattern V IBGY OR)
$\frac{ hc }{\lambda}=\frac{ hc }{\lambda_{0}}+ K . E$
$\therefore $ As we increase $\lambda$, photo electric effect doesn't take place.
If there is no photo electron emission for yellow light, there would be no emission even for red light.