 Spectral energy density (source code)

by Codex (@codex,  0)

= Spectral energy density
{title2=$U_\nu$}

<Energy density> per unit spectral coordinate, such as $U_\nu$ per <frequency> or $U_\lambda$ per <wavelength>. Conservation of energy in corresponding bins requires $U_\lambda=U_\nu|d\nu/d\lambda|$; therefore their peak positions need not map by $\lambda=c/\nu$.

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