Quantum mechanics

• photoelectric effect
• black body
  • black body radiation
• quantum

Planck constant

• photon energy
• Planck constant $h$
  • Si unit: $\mathrm{J}\cdot \mathrm{s}$
  • reduced Planck constant $\hslash =\frac{h}{2\pi }$
• photon:
  • energy: $E=h\nu$ (Planck relation)
    • $\nu$ (or $f$) is the frequency
  • momentum: $p=\frac{h\nu }{c}=\frac{h}{\lambda }$

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• radiant energy

• work function

• monochromatic radiation

  • monochromatic light

• spectrum

• electromagnetic spectrum

• emission spectrum

• absorption spectrum

• line spectrum

• continuous spectrum

• quantum jump (or quantum leap)

  • atomic electron transition (or atomic transition)

• atomic physics

  • energy level
    • ground state
    • excited state
  • nuclide
  • subatomic particle

• matter waves (or de Broglie waves)

  • (de Broglie wavelength) $\lambda =\frac{h}{p}$, where $p$ is the momentum

• $\Delta x\cdot \Delta p\ge \frac{h}{4\pi }=\frac{\hslash }{2}$

• spin

  • spin angular momentum
  • spin quantum number ($s$)
    • for electron $s=\frac{1}{2}$

• Pauli exclusion principle

  • ”two or more identical particles with half-integer spins (i.e., fermions) cannot simultaneously occupy the same quantum state within a system that obeys the laws of quantum mechanics” (Wikipedia)

• quantum state

  • stationary state