Question

What happens when light below caesium’s threshold frequency falls on it, regardless of intensity?

Options

• The threshold frequency increases with intensity.

• Photoelectrons are emitted with maximum kinetic energy.

• No photoelectrons are emitted.

• More photoelectrons are emitted as intensity increases.

Answer 1

Below the threshold frequency, each photon has less energy than the work function. Increasing intensity adds photons but does not make any individual photon energetic enough to emit an electron.