Monochromatic radiation emitted when ele...

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

`5 xx 10^15` Hz

`1.6 xx10^15` Hz

`2.5 xx 10^15` Hz

`4 xx 10^15`Hz

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