Question

What happens if photon energy is less than the work function?

विकल्प

• Electrons cannot escape from the metal surface, so no emission takes place.

• The maximum kinetic energy increases.

• The work function becomes the stopping potential.

• More electrons are emitted immediately.

Answer 1

If photon energy is less than the work function, an electron cannot escape the metal surface. This is why no emission takes place below the threshold frequency.