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Monochromatic radiation emitted when ele...

Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be 3.57 V. The threshold frequency of the material is

A

` 1.6 xx 10^(15) Hz `

B

`2.5 xx 10^(15) Hz `

C

`4 xx 10^(15) Hz `

D

`5 xx 10^(15) Hz `

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The correct Answer is:
A
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