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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 emmited photoelectrons in the second case is 3 times that in the first case the work function of the surface of the material is: (h= plank's constant , c=speed of light).

A

`(hc)/(3lambda)`

B

`(hc)/(2lambda)`

C

`(hc)/(lambda)`

D

`2(hc)/(lambda)`

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