The ejection of the photoelectrons from the silver metal in the photoelectric effect experiment can be stopped by applying the voltage of 0.35 V when the radiation 256.7 nm is used. Calculate the work function for silver metal.
The ejection of the photoelectrons from the silver metal in the photoelectric effect experiment can be stopped by applying the voltage of 0.35 V when the radiation 256.7 nm is used. Calculate the work function for silver metal.
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1 Answer
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λ = 256.7 nm = 256.7 x 10-9 m
K.E. = 0.35 eV
E = hc/ λ = (6.626 x 10-34Js) / (3 x 108 ms-1) / (256.7 x 10-9 m)
= (6.626 x 3 x 10-17) J/ 256.7
= (6.626 x 3 x 10-17) / (256.7 x 1.602 x 10-19) eV
E = 4.83 eV
The potential applied to silver gets converted into kinetic energy of the photoelectron.
So, Kinetic energy, K.E= 0.35 V
=> K.E= 0.35 eV
E = W0 + K.E.
=> W0 = E – K.E.
= 4.83 eV – 0.35 eV = 4.48 eV.
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