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benda hitam sempurna → e = 1
r = 5 cm = 5×10^-2 m
T = 327 °C = 600 K
Daya radiasi
(Hk Stefan Boltzmann)
P = e σ T⁴ A
P = 1 • 5,67×10^-8 • 600⁴ • (π • (5×10^-2)²)
P = 57,7 W ← jwb
Panjang gelombang saat intensitas radiasi maksimum
(HK pergeseran Wien)
λ T = 2,89×10^-3
λ • 600 = 2,89×10^-3
λ = 4,82×10^-6 m ← jwb