Electronsareemittedwithzerovelocityfromametalsurfacewhenit isexposed toradiationof wavelength6800A . Calculatethresholdfrequency(V_(0))and workfunction(W_(0))of themetal.

Electronsareemittedwithzerovelocityfromametalsurfacewhenit isexposed t

1.	Electronsareemittedwithzerovelocityfromametalsurfacewhenit isexposed toradiationof wavelength6800A . Calculatethresholdfrequency(V_(0))and workfunction(W_(0))of themetal.
Answer» Solution :Where`lambda =6800 A = 6800 xx 10^(10) m = 6.8 xx 10^(7) m` WORKFUNCTION`(W_(0)) = hv_(0) ` but `V=(c)/(lambda)` Thresholdfrequency `(V_(0))= (W_(0))/( h) = (2.923 xx 10^(19))/(6.626 xx 10^(34)J s)` `=4.411xx 10^(14) s^(1)` `4.411 xx 10^(14) Hz`