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Threshold wavelength for a metal having ...

Threshold wavelength for a metal having work function `w_(0)` is `lambda`. Then the threshold wavelength for a metal having work function `2 w_(0)` is

A

`4lambda_(0)`

B

`2lambda_(0)`

C

`lambda_(0)//2`

D

`lambda_(0)//4`

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The correct Answer is:
b
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