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Photons of energy 1 eV and 2.5 eV sucess...

Photons of energy 1 eV and 2.5 eV sucesseively illuminate a metal,whose work function is 0.5 eV,the ratio of maximum speed of emitted electron is…..

A

`2:1 `

B

`1:2`

C

`3:1`

D

`1:1`

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