12.1 Photoelectric Effect lesson #2

12.1 Photoelectric Effect

Photoelectric Effect - A-level Physics - YouTube

Multiple Choice

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

• Isaac Newton

• Huygens

• Planck

• Einstein

Multiple Choice

What is the energy of one photon equal to?

• ƒ

• hB

• h

• hƒ

Multiple Choice

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

• Photoelectric effect

• Refraction

• Interference

• Diffraction

Multiple Choice

What is the equation for the photoelectric effect?

• Ek = hƒ - Phi

• Ek = hƒ * Phi

• Ek = hƒ + Phi

• Ek = hƒ / Phi

Multiple Choice

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

Multiple Choice

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

Multiple Choice

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.

Explanation Slide...

Multiple Choice

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

• Work function

• Threshold frequency

• Stopping potential

• Planck's constant

Multiple Choice

What is the energy needed to liberate an electron called?

• Work function

• Kinetic energy

• Potential energy

• Stopping potential

Explanation Slide...

Multiple Choice

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

Multiple Choice

What did the photoelectric effect prove about the intensity of light?

• Higher intensity increases kinetic energy

• Higher intensity decreases kinetic energy

• Higher intensity does not affect kinetic energy

• Higher intensity stops electrons from being liberated

Multiple Choice

Choose the correct statement associated to the increase of the intensity of light.

• increases to the number of photons

• increases the kinetic energy of the emitted electrons

• increases the energy of the light

• increases the momentum of each photon

Multiple Choice

What is the charge of an electron?

• 3.00 x 10^8 m/s

• 1.6 x 10^-19 C

• 9.81 m/s^2

• 6.63 x 10^-34 J

Multiple Choice

What is the equation for the maximum kinetic energy of an electron?

• Ek max = e Vs

• Ek max = hƒ

• Ek max = e V

• EK max = hƒ/Phi

Multiple Choice

What is the energy left over for an electron after being liberated?

• Kinetic energy

• Potential energy

• Energy needed to liberate it

• Energy given to it by the photon

Multiple Choice

What does the photoelectric effect prove about the nature of light?

• Light exists as waves

• Light does not exist

• Light exists as particles

• Light exists as both waves and particles