Question

In a photoelectric experiment with a material of work function 2.1 eV, the stopping potential is found to be 2.5 V. The maximum kinetic energy of ejected photoelectrons is ______.

Options

• 0.4 eV

• 2.1 eV

• 2.5 eV

• 4.6 eV

Answer 1

In a photoelectric experiment with a material of work function 2.1 eV, the stopping potential is found to be 2.5 V. The maximum kinetic energy of ejected photoelectrons is 2.5 eV.

Explanation:

Kmax = eV_s

= (1 × 2.5)eV

= 2.5 eV