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Blackbody Radiation
AP Physics 2 · Unit 15 Modern Physics
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Learning Objectives
Understand blackbody radiation spectrum
Apply Wien's displacement law: λ_max = b/T
Calculate total power: P ∝ T⁴ (Stefan-Boltzmann)
Explain ultraviolet catastrophe & Planck's solution
Key Equations
λ_max = 2.898×10⁻³/T (Wien)
P = σAT⁴ (Stefan-Boltzmann)
σ = 5.67×10⁻⁸ W/m²K⁴
b = 2.898×10⁻³ m·K
Tags
blackbody
Wien's law
Planck
radiation
AP Physics 2
λ_max
0 nm
Region
—
Temperature (K)
5778
Star Presets
🔴 Red dwarf 3000K
☀️ Sun 5778K
🔵 Sirius 10000K
💠 Rigel 14000K
Derived Values
λ_max
0 nm
Color
—
P (relative)
—
T
0 K
Color Swatch
Quick Quiz
If a star's temperature doubles, its peak wavelength:
Halves
Doubles
Stays same
Quadruples