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8 results for “radiation”

Formulae (8)

j = \sigma T^4

Total energy radiated by a black body scales with the fourth power of temperature.

E = hf

Quantised energy of radiation.

\lambda_{max} = \frac{b}{T}

Peak emission wavelength of a hot body.

L = 4\pi R^2 \sigma T^4

Luminosity of a star from radius and temperature.

\lambda_{max} = \frac{b}{T}

Peak emission wavelength of a blackbody.

L_{Edd} = \frac{4\pi G M m_p c}{\sigma_T}

The maximum steady luminosity before radiation blows a star apart.

T = \frac{\hbar c^3}{8\pi G M k_B}

Temperature of the radiation a black hole emits.

\alpha = \frac{\text{reflected}}{\text{incident}}

Fraction of solar radiation reflected by a surface.