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Radiations of two photons's energy, twic...

Radiations of two photons's energy, twice and five times the work function of metal are incident on the, metal surface successively. The ratio of maximum velocities of photoelectrons emitted in two cases is

A

`1 : 1`

B

`1 : 2`

C

`1 : 3`

D

`1 : 4`

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