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Work function of photosensitive surface ...

Work function of photosensitive surface is `phi` .When photon of `3phi` energy is incident on surface electron with maximum speed of `6xx10^(6)m//s` is emitted from the surface .If energy of photon is changed to `9phi`,maximum speed of photoelectron will be.......

A

`12 xx 10^6 m//s`

B

`6 xx 10^6 m//s`

C

`3 xx 10^6 m//s`

D

`24 xx 10^6 m//s`

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