Photoelectric Effect Quiz

What is the photoelectric effect?

• The absorption of photons by electrons.

• The reflection of light from metallic surfaces.

• The process of converting light into electrical energy.

• The emission of electrons by substances when light falls on their surfaces.

What happens when light of a frequency below the threshold frequency falls on a metal?

• Electrons are emitted after a delay.

• No electrons are emitted.

• The metal becomes superconductive.

• The frequency of the light increases.

What is required for an electron to escape the metal lattice?

• Application of an external electric field.

• Absorption of multiple photons of any frequency.

• A decrease in the intensity of light.

• Absorption of a single photon with sufficient energy.

What determines the maximum kinetic energy of the emitted photoelectrons?

• The angle of incidence of the light.

• The type of metal surface.

• The intensity of the incident light.

• The frequency of the incident light.

What is the 'work function' in the context of the photoelectric effect?

• The maximum kinetic energy of photoelectrons.

• The energy required to free an electron from the metal.

• The total energy of the incident light.

• The energy required to generate a current.

How does the photoelectric effect support the particle theory of light?

• By showing that light behaves as if it were a particle.

• By showing that light intensity affects electron emission.

• By demonstrating that light can be reflected.

• By proving that light can only travel in a vacuum.

What is the threshold frequency?

• The maximum frequency of light that can be absorbed.

• The frequency at which light becomes visible.

• The frequency at which all metals emit electrons.

• The minimum frequency of incident radiation that causes emission of photoelectrons.

What happens to the excess energy of a photon after freeing an electron?

• It is reflected back as light.

• It is converted into heat.

• It contributes to the electron's kinetic energy.

• It is absorbed by the metal lattice.

What is the significance of the 'all or nothing' concept in photoelectric emission?

• All the electrons in the metal absorb energy equally.

• Every photon must be absorbed for electron emission to occur.

• Electrons must absorb all the energy from one photon to be emitted.

• Electrons can absorb energy from multiple photons before emission.

What does the equation E = hf = Φ + Ek (MAX) represent in the photoelectric effect?

• The total energy of the incident photons.

• The relationship between photon energy, work function, and maximum kinetic energy of photoelectrons.

• The intensity of the incident light required for electron emission.

• The maximum frequency of light that can be absorbed by electrons.