12.1 Photoelectric Effect Quiz

Who was the first person to come up with a quantum theory of light?

• Isaac Newton

• Huygens

• Planck

• Einstein

What is the energy of one photon equal to?

• ƒ

• hB

• h

• hƒ

What is the main piece of evidence for the quantum theory of light?

• Photoelectric effect

• Refraction

• Interference

• Diffraction

What is the equation for the photoelectric effect?

• Ek = hƒ - Phi

• Ek = hƒ * Phi

• Ek = hƒ + Phi

• Ek = hƒ / Phi

What is the work function of a metal?

• Energy absorbed by an electron

• Energy left over for an electron

• Energy given to an electron

• Energy needed to liberate an electron

What is the threshold frequency?

• Frequency at which photons are absorbed

• Frequency at which all electrons are liberated

• Frequency at which electrons start being liberated

• Frequency at which no electrons are liberated

What does the stopping potential measure?

• Energy needed to liberate electrons from one side of the plate.

• Energy absorbed by electrons

• Potential energy of electrons

• Kinetic energy of electrons until they cannot reach the other plate.

Answer explanation

What does the gradient of the kinetic energy versus frequency graph represent?

• Work function

• Threshold frequency

• Stopping potential

• Planck's constant

What is the energy needed to liberate an electron called?

• Work function

• Kinetic energy

• Potential energy

• Stopping potential

Answer explanation

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

• Electrons have maximum kinetic energy

• No electrons are liberated

• Some electrons are liberated

• All electrons are liberated