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Question

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:


A
No electron will be emitted
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B
Less electrons will be emitted
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C
More electrons will be emitted
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D
We can not predict
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Solution

The correct option is A No electron will be emitted
Wavelength of $$Red > Yellow > Green$$
(learn the pattern $$VIBGYOR$$)
$$\dfrac{hc}{\lambda }=\dfrac{hc}{\lambda _{0}}+K.E$$
$$\therefore$$ 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.

Physics

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