Heat transfer processes

Planck law

dP_λ

		x
W

λ	m

m²

dλ

h	J·s
6.626E-34

c	m/s
3E8

h	J·s
6.626E-34

c	m/s
3E8

k	J/K
1.381E-23

1. Define values of all variables, besides sought quantity
2. Change units if necessary
3. Click "Calculate"

		variables: dP_λ - power radiated in the range of wave length from λ to λ+dλ h - Planck's constant c - velocity of light in free space λ - length of emitted wave S - area of emitting surface dλ - spectral range k - Boltzmann constant T - temperature of radiating body