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Maximum kinetic energy of photoelectrons...

Maximum kinetic energy of photoelectrons emitted from a metal surface, when light of wavelength `lambda` is incident on it, is 1 eV. When a light of wavelength `lambda/3` is incident on the surfaces, maximum kinetic energy becomes 4 times. The work function of the metal is

A

`"hc"/lambda`

B

`"hc"/(3lambda)`

C

`(2hc)/lambda`

D

`"hc"/(2lambda)`

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