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 isA. `1.6xx10^(15) Hz`B. `2.5xx10^(15) Hz`C. `4xx10^(15) Hz`D. `5xx10^(15)Hz`

Monochromatic radiation emitted when electron on hydrogen atom jumps f

1.	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 isA. `1.6xx10^(15) Hz`B. `2.5xx10^(15) Hz`C. `4xx10^(15) Hz`D. `5xx10^(15)Hz`
Answer» Correct Answer - 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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