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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 `3.57V`. The threshold frequency of the material is

A

`4xx 10^(15)` Hz

B

`5 xx 10^(15)` Hz

C

`1.6 xx 10^(15)` Hz

D

`2.5 xx 10^(15)` Hz

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