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The photoelectric threshold wavelength f...

The photoelectric threshold wavelength for potassium (work function being `2 eV`) is

A

`310 nm`

B

`620 nm`

C

`1200 nm`

D

`2100 nm`

Text Solution

Verified by Experts

The correct Answer is:
B
`lambda = (12375)/(W_(0)) = (12375)/(2) = 6187.5 Å = 620 nm`
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