The photoelectric effect and the wave model

Interactive lesson
The photoelectric effectInteractive lesson
Intensity is energy per secondInteractive lesson
A minimum frequency to eject electronsInteractive lesson
Above the minimum, ejection is instantInteractive lesson
Threshold frequencyInteractive lesson
Intensity sets how many electronsInteractive lesson
Frequency sets maximum electron energyInteractive lesson
What the wave model predictsInteractive lesson
The threshold breaks the wave modelInteractive lesson
Instant ejection breaks the wave model

The photon model

Interactive lesson
The photonInteractive lesson
Photon energy grows with frequencyInteractive lesson
Rank photons by energyInteractive lesson
The photon-energy equationInteractive lesson
Calculate a photon's energyInteractive lesson
Intensity means photon countInteractive lesson
One photon, one electronInteractive lesson
Photons explain the thresholdInteractive lesson
Photons explain instant ejectionInteractive lesson
Photons explain the intensity effectInteractive lesson
Photons explain the frequency effectInteractive lesson
Predict photoelectric outcomes

Wave-particle duality and quantum states

Interactive lesson
Wave-side evidenceInteractive lesson
Particle-side evidenceInteractive lesson
Wave-particle duality of lightInteractive lesson
Choose the more useful modelInteractive lesson
Matter has duality tooInteractive lesson
Quantum stateInteractive lesson
Superposition of quantum statesInteractive lesson
Superposition connects to dualityInteractive lesson
The Heisenberg uncertainty principleInteractive lesson
Technologies built on quantum physics