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A metallic surface ejects electrons when exposed to green light of intensity I but no photoelectrons are emitted when exposed to yellow light of intensity I. It is possible to eject electrons from the same surface by

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yellow light of some intensity which is more than $l$ .

green light of any intensity.

red light of any intensity.

violet light of any intensity.

answer is B, D.

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Detailed Solution

The VIBGYOR pattern, representing the colours of visible spectrum in increasing magnitude of wavelength, shows that V-I-B-G all have $λ$ less than that of yellow colour and hence can initiate photoelectric effect irrespective of intensity.

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