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If photons of frequency v are incident o...

If photons of frequency v are incident on the surface of metals A and B of threshold frequencies `v/2` and `v/3` respectively, the ratio of the maximum kinetic energy of electrons emitted from A to that from B is:

A

`2:3`

B

`3:4`

C

`1:3`

D

`sqrt3: sqrt2`

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