symbol

meaning

numerical value

c

light velocity

299,792,458 m/s

h

Planck constant

6.62607015 × 10⁻³⁴ J/Hz

k

Boltzman constant

1.380649 × 10⁻²³ J/K

T

Temperature of the sun

5772 K

${\nu }_{yellow}$

frequency of the color yellow

520 × 10¹² Hz

${\nu }_{red}$

frequency of the color red

440 × 10¹² Hz

$\mu$

coefficient of attenuation for frequencies

4.4 × 10⁻⁷ m²/kg