A photoelectric surface is illuminated s...

A photoelectric surface is illuminated successively by monochromatic light of wavelength `lambda` and `(lambda)/(2)`. If the maximum kinetic energy of the emitted photoelectrons in the second case is `3` times than in the first case , the work function of the surface of the material is
(`h` = Plank's constant , `c` = speed of light )

`(hc)/(2lambda)`

`(3hc)/(lambda)`

`(hc)/(3lambda)`

`(hc)/(lambda)`

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