The Photoelectric Effect and Related Concepts

Front

What is the photoelectric effect?

Back

The photoelectric effect refers to the phenomenon in which electrons are ejected from the surface of a material (usually metal) when it is exposed to light (or electromagnetic radiation) with a frequency above a certain threshold.

Front

Who first explained the photoelectric effect and when?

Back

Albert Einstein explained the photoelectric effect in 1905.

Front

What is a photon?

Back

A photon is a particle of light, or a quantum of electromagnetic radiation, with energy determined by its frequency.

Front

What is the equation for the energy of a photon?

Back

Front

What is the work function (Φ)?

Back

The work function is the minimum energy required to eject an electron from the surface of a material, measured in electron volts (eV).

Front

What is the threshold frequency (f₀)?

Back

The threshold frequency is the minimum frequency of light needed to emit electrons from a given material.

Front

What is the relationship between threshold frequency and work function?

Back

f₀ = Φ/h, where f₀ is the threshold frequency, Φ is the work function, and h is Planck’s constant.

Front

What is the photoelectric effect equation?

Back

E = Φ + K.E where E is the energy of the incoming photon, Φ is the work function, and K.E is the maximum kinetic energy of the emitted electron.

Front

What happens when the frequency of light is below the threshold frequency?

Back

No electrons are emitted, regardless of the intensity of the light.

Front

What is the maximum kinetic energy of the emitted electron?

Back

K.E = h ⋅ f - Φ, where E is the kinetic energy of the emitted electron.