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In photoelectric effect threshold wavele...

In photoelectric effect threshold wavelength of sodium is 5000Å .Find its work function.
[`h=6.6xx10^(-34)Js,c=3xx10^(8)m//s,1eV=1.6xx10^(-19)Js]`

A

`2.5 eV `

B

`5.0 eV `

C

`7.5 eV `

D

`10 eV `

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