A photoelectric surface is illuminated successively by monochromatic light of wavelength λ and 
. 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 ( 
Planck's constant, 
speed of light)
Text Solution
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According to Einstein's photoelectric equation,
…… ..(i)
Similarly, in second case, maximum kinetic energy of emitted electron is 3 times that in first case, we get
…… ..(ii)
Solving Eqs. (i) and (ii), we get work function of an emitted electron from a metal surface.
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