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 that in the first case, the work function of the surface of the material is (h = Planck's constant, c= speed of light)

`(hc)/(2lambda)`

`(3hc)/(lambda)`

`(hc)/(3lambda)`

`(hc)/(lambda)`

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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 )

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A photonsensitive metallic surface is illuminated alternately with light of wavelength 3100 Å and 6200 Å . It is observed that maximum speeds of the photoelectrons in two cases are in ratio 2 : 1 . The work function of the metal is (hc = 12400 e VÅ)

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