Question

Define the term work function of a metal. The threshold frequency of a metal is f₀ when the light of frequency 2f₀ is incident on the metal plate, the maximum velocity of electrons emitted is v₁. When the frequency of the incident radiation is increased to 5f₀, the maximum velocity of electrons emitted is v₂. Find the ratio of v₁ to v₂.

Answer 1

Work function (W₀): The minimum energy required in order to remove the electrons from the metal surface so as to overcome the surface barrier is called the work function of the metal.

From Einstein’s photoelectric equation,