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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:

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a

We cannot predict

b

photo current increases

c

Maximum kinetic energy of photoelectrons is more than that with green light

d

No electron will be emitted

answer is A.

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Detailed Solution

 λyellow>λ0>λgreen  and λred>λyellowNo photo electric effect

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