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The work function for the surface of alu...

The work function for the surface of aluminium is 4.2 eV. What will be the wavelenght of that incident light for which the stopping potential will be zero.
`(h=6.6xx10^(-34)J-se=1.6xx10^(-19)C)`

A

2496 `overset(@)A`

B

`2946xx10^(-7)m`

C

`2649 overset(@)A`

D

`2946 overset(@)A`

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