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Ultraviolet light of 200 nm wavelength i...

Ultraviolet light of 200 nm wavelength is incident on nickel surface having work function of 5.01 eV.Potential difference of ………
Volt should be applied to stop electron emitted with maximum speed.

A

2.4 V

B

`-1.2V`

C

`-2.4 V`

D

1.2V

Text Solution

Verified by Experts

The correct Answer is:
D
`K_(max)=(hc)/(lambda)-W=(hc)/(lambda)-5.01`
`=(12375)/(lambda (In Å))-5.01`
`(12375)/(2000)-5.01`
`=6.1875-5.01`
`=1.1787~~1.2 V`
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