Two metals A B have work functions 4 eV 10 eV respectively. Which metal has lower threshold frquency?
An expression for the work function in terms of threshold wavelength , planks constant and speed of light is given as,
or,
As the product is constant, so we can write,
By using above equation we can concluded that greater the work function lesser will be the threshold wavelength. Thus, the metal having greater work function value (10 ev) will have smaller threshold wavelength than that metal having work function value (4 ev) respectively.
or,
As the product is constant, so we can write,
By using above equation we can concluded that greater the work function lesser will be the threshold wavelength. Thus, the metal having greater work function value (10 ev) will have smaller threshold wavelength than that metal having work function value (4 ev) respectively.