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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

`1.6xx10^(15) Hz`

B

`2.5xx10^(15) Hz`

C

`4xx10^(15) Hz`

D

`5xx10^(15)Hz`

Text Solution

Verified by Experts

The correct Answer is:
A
Energy released from emmition of electron is E=(-3.4)-(-13.6)=10.2 eV.
From photo-electric equation, work function `phi=E- eV_(0)=h upsilon_(0)`
On Solving this `upsilon_(0)=1.6xx10^(15) Hz`
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