The expression for work function for Li is,
v0= Here, the threshold frequency is given as
v0 and the work function is
W0 Substitute the given value in above expression.
v0=| 2.42×1.602×10−19J |
| 6.626×10−34Js |
=0.584×1015s−1 The expression for work function for K is,
v0= Substitute the given value in above expression.
v0=| 2.25×1.602×10−19J |
| 6.626×10−34Js |
=0.54×1015s−1 The expression for work function for Mg is,
v0= Substitute the given value in above expression.
v0=| 3.70×1.602×10−19J |
| 6.626×10−34Js |
=0.89×1015s−1 The expression for work function for Ag is,
v0= Substitute the given value in above expression.
v0=| 4.30×1.602×10−19J |
| 6.626×10−34Js |
=1.03×1015s−1 The expression for work function for Cu is,
v0= Substitute the given value in above expression.
v0=| 4.80×1.602×10−19J |
| 6.626×10−34Js |
=1.16×1015s−1 The frequency of light is given as,
v== =0.56×1015s−1 The condition at which the photoelectric effect is shown is
v>v0, which is only observed in case of Potassium.