Question

A photosensitive surface emits photoelectrons when red light falls on it. Will the surface emit photoelectrons when blue light is incident on it? Give reason. [Foreign 2017]

Answer 1

Answer:

YES

Explanation:

we know that E =hc /λ

here Red light (threshold wavelength for that surface )is falling on the surface emits a photo electron

TRICK : as wavelength decreases from threshold,emission is a sure process

REASON : As λ decreases ν increases and Ε increases

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