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A photoelectric surface is illuminated successively by monochromatic light of wavelength  λ and λ/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 materiall is (h=Planck’s constant, c=speed of light)

(a)hc/2λ

(b)hc/λ

(c)2hc/λ

(d)hc/3λ

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