Photoelectric effect quiz for AP Physics 2: 10 questions with answers

by aicko
28 October 202628 October 2026

Quick answer: Light is absorbed and emitted in photons, each carrying energy E = hf. This AP Physics 2 quiz checks photoelectric effect with 10 multiple-choice questions and instant feedback; every answer comes with a short explanation.

Photoelectric effect quiz for AP Physics 2: 10 questions with answers

This photoelectric effect quiz for AP Physics 2 has quick multiple-choice questions with instant feedback. Need a refresher first? Read the lesson or do the worksheet on photoelectric effect.

Choose the best answer. Typical traps are confusing brightness with frequency, mixing eV and joules and dividing in the wrong order.

Level: AP Physics 2 (algebra-based) · Curriculum: AP P2 Unit 15

Contents

Photoelectric effect quiz: the questions

Which change increases the maximum kinetic energy of photoelectrons?

What is the photon energy for 620 nm light? (hc = 1240 eV·nm)

Red light of high intensity cannot eject electrons from a metal. Why?

What does the gradient of a K max against f graph give?

Doubling the intensity of light above the threshold frequency does what to the current?

Which formula gives the de Broglie wavelength?

Why does a thrown ball show no wave behaviour?

A metal has φ = 3.0 eV. What is the threshold wavelength? (hc = 1240 eV·nm)

What does electron diffraction show?

The stopping potential for a metal is 1.2 V. What is K max?

Photon energy formula? — E = hf = hc / λ

Value of hc in eV·nm? — 1240 eV·nm

Photoelectric equation? — K max = hf − φ

Threshold frequency? — f₀ = φ / h

Stopping potential relation? — eV s = K max

What does brightness change? — Number of photons, so current

de Broglie wavelength? — λ = h / p

Planck constant? — 6.63 × 10⁻³⁴ J·s

1 eV in joules? — 1.60 × 10⁻¹⁹ J

Gradient of K max against f? — The Planck constant h

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