AP Physics 2: Algebra-Based Practice Quiz: The Photoelectric Effect
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Test your understanding with short quizzes. This quiz has 10 questions to check your progress.
Question 1 of 10
All Questions (10)
A) The emission of electrons from a material when electromagnetic radiation is incident upon it.
B) The reflection of photons from a photoactive material's surface.
C) The absorption of electrons by a material when it is cooled.
D) The emission of light from a material when an electric current passes through it.
Correct Answer: A
The content explicitly defines the photoelectric effect as 'the emission of electrons when electromagnetic radiation is incident upon a photoactive material.'
A) Electrons and Protons
B) Photons and Matter
C) Neutrons and Electrons
D) Two different types of matter
Correct Answer: B
The first point of the provided content states that the photoelectric effect is an 'interaction between photons and matter.'
A) Kinetic Frequency
B) Incident Frequency
C) Photon Frequency
D) Threshold Frequency
Correct Answer: D
The text clearly states, 'The emission of electrons via the photoelectric effect requires a minimum frequency of incident light, called the threshold frequency.'
A) Electrons are emitted, but with very low kinetic energy.
B) No electrons are emitted.
C) Twice as many electrons are emitted.
D) The material emits photons instead of electrons.
Correct Answer: B
The concept of a 'minimum frequency' (the threshold frequency) implies that if the incident radiation's frequency is below this minimum, the condition for electron emission is not met, and thus no electrons will be emitted.
A) K_max = hf + ϕ
B) K_max = ϕ / hf
C) K_max = hf - ϕ
D) K_max = ϕ - hf
Correct Answer: C
The provided content gives the specific equation: 'The maximum kinetic energy of an emitted electron is given by the equation: K_max = hf - ϕ.'
A) As frequency increases, the maximum kinetic energy decreases.
B) As frequency increases, the maximum kinetic energy increases.
C) The frequency of light has no effect on the maximum kinetic energy.
D) The relationship is inverse and squared.
Correct Answer: B
In the equation K_max = hf - ϕ, K_max is directly and linearly proportional to the frequency, f. Therefore, an increase in f will result in a corresponding increase in K_max.
A) Photons
B) Protons
C) Electrons
D) Neutrons
Correct Answer: C
The definition provided in the content is 'The photoelectric effect is the emission of electrons...'
A) is capable of emitting electrons when struck by electromagnetic radiation of sufficient frequency.
B) is radioactive and emits photons.
C) changes its chemical structure when exposed to light.
D) can only interact with visible light, not other forms of electromagnetic radiation.
Correct Answer: A
The text describes the photoelectric effect as the emission of electrons from a 'photoactive material' when electromagnetic radiation is incident upon it. This implies that being 'photoactive' is the property of being able to emit electrons in this manner.
A) Negative
B) Infinite
C) At its maximum possible value
D) Zero
Correct Answer: D
The threshold frequency is the absolute minimum frequency needed to emit an electron. At this frequency, all the photon's energy is used to free the electron, leaving no energy for motion. Thus, its kinetic energy is zero. In the equation K_max = hf - ϕ, at the threshold frequency, hf equals ϕ, so K_max is zero.
A) The emitted electron
B) The incident photon
C) The photoactive material
D) The threshold frequency
Correct Answer: B
The photoelectric effect is an interaction where a photon strikes the material. The equation balances the energy: the incoming energy (from the photon, hf) is converted into the energy needed to free the electron (ϕ) and the leftover kinetic energy of the electron (K_max). Therefore, hf represents the energy of the incident photon.