E.2 Quantum physics

Objective notes

9 learning objectives

—E.2.1 (HL)—Photoelectric effect

• Photoelectric effect is evidence for particle nature of light.

—E.2.2 (HL)—Threshold frequency

• Photoelectrons require photons above threshold frequency.

—E.2.3 (HL)—Photoelectric equation

• Photoelectric equation: Emax = hf - Φ.

—E.2.4 (HL)—Particle diffraction

• Particle diffraction is evidence for wave nature of matter.

—E.2.5 (HL)—Matter wave-particle duality

• Matter exhibits wave-particle duality.

—E.2.6 (HL)—de Broglie wavelength

• de Broglie wavelength: λ=h/p.

—E.2.7 (HL)—Compton scattering

• Compton scattering is evidence for particle nature of light.

—E.2.8 (HL)—Photon wavelength increase

• Scattered photons have increased wavelength.

—E.2.9 (HL)—Compton wavelength shift

• Compton shift: Δλ = h/(mec)(1-cosθ).