Value of work function (W0) for a few metals are given below Metal Li Na K Mg Cu Ag W0/eV 2.42 2.3 2.25 3.7 4.8 4.3 The number of metals which will show photoelectric effect when light of wavelength 4

Question

Value of work function (W0) for a few metals are given below Metal Li Na K Mg Cu Ag W0/eV 2.42 2.3 2.25 3.7 4.8 4.3 The number of metals which will show photoelectric effect when light of wavelength 400nm falls on it is Given: h = 6.6 × 10–34Js c=3×108m s–1 e=1.6 × 10–19 C

Prashant Kotian · Accepted Answer

Correct answer: .. The energy photon (E) =  hc  = 400 nm    (E) = 8 10 10 10 .       E (in eV) = 9 34 6 . 10 10 10 .          eV The metals Li, Na, k have a work function less than the energy of a photon. So in presence of light with wavelength 400 nm, they exhibit photo electric effect.

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