AP Physics 2 / Unit 15: Modern Physics
15.1 Quantum Theory and Wave-Particle Duality
Notes
Light and matter show both wave and particle behavior.
- Photon energy: $E=hf$.
- de Broglie wavelength: $\displaystyle \lambda=\frac{h}{p}$.
Practice
Which shows electrons acting like waves?
Interference is wave behavior.
Increasing an electron's momentum makes its de Broglie wavelength:
$\displaystyle \lambda=\frac{h}{p}$.
Higher-frequency photons have:
$E=hf$.
Ready for more? Take the Unit 15 test.