What you’ll learn9 learning objectivesChoose one objective for a focused lesson, or study the complete topic.—E.2.1 (HL)—Photoelectric effect• Photoelectric effect is evidence for particle nature of light.Syllabus objective—E.2.2 (HL)—Threshold frequency• Photoelectrons require photons above threshold frequency.Syllabus objective—E.2.3 (HL)—Photoelectric equation• Photoelectric equation: Emax = hf - Φ.Syllabus objective—E.2.4 (HL)—Particle diffraction• Particle diffraction is evidence for wave nature of matter.Syllabus objective—E.2.5 (HL)—Matter wave-particle duality• Matter exhibits wave-particle duality.Syllabus objective—E.2.6 (HL)—de Broglie wavelength• de Broglie wavelength: λ=h/p.Syllabus objective—E.2.7 (HL)—Compton scattering• Compton scattering is evidence for particle nature of light.Syllabus objective—E.2.8 (HL)—Photon wavelength increase• Scattered photons have increased wavelength.Syllabus objective—E.2.9 (HL)—Compton wavelength shift• Compton shift: Δλ = h/(mec)(1-cosθ).Syllabus objective