AP Physics 2: Algebra-Based Flashcards: The Photoelectric Effect
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Review key ideas with interactive flashcards. This set includes 10 cards to help you master important concepts.
What role does a 'photoactive material' play in the photoelectric effect?
A photoactive material is the substance that emits electrons when it absorbs energy from incident electromagnetic radiation.
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What role does a 'photoactive material' play in the photoelectric effect?
A photoactive material is the substance that emits electrons when it absorbs energy from incident electromagnetic radiation.
What is the photoelectric effect?
The photoelectric effect is the emission of electrons when electromagnetic radiation is incident upon a photoactive material.
What is the equation for the maximum kinetic energy ($K_{max}$) of an electron emitted during the photoelectric effect?
The maximum kinetic energy of an emitted electron is given by the equation: $K_{max} = hf - \phi$.
What condition must be met for electron emission to occur via the photoelectric effect?
The incident electromagnetic radiation must have a frequency equal to or greater than the material's threshold frequency.
What particle is emitted from a photoactive material during the photoelectric effect?
Electrons are emitted from the material when it is struck by electromagnetic radiation of a sufficient frequency.
Describe the photoelectric effect in terms of photons and electrons.
The photoelectric effect is an interaction where a photon strikes a photoactive material, causing the emission of an electron.
What fundamental interaction does the photoelectric effect describe?
The photoelectric effect describes an interaction between photons (from electromagnetic radiation) and matter (a photoactive material).
If light with a frequency below the threshold frequency hits a photoactive material, will electrons be emitted?
No, electrons will not be emitted because the incident light's frequency is below the required minimum for the photoelectric effect to occur.
According to the equation $K_{max} = hf - \phi$, what is the relationship between the incident light's frequency (f) and the electron's maximum kinetic energy ($K_{max}$)?
There is a direct, linear relationship; as the frequency of the incident light increases, the maximum kinetic energy of the emitted electron also increases.
What is the threshold frequency?
The threshold frequency is the minimum frequency of incident light required for the emission of electrons via the photoelectric effect.