Heat transfer processes

Planck law

power radiated in the range of wave length from λ to λ+dλ

dP_λ =

		x
W

Planck's constant

h =

6.626E-34

J·s

velocity of light in free space

c =

3E8

m/s

length of emitted wave

λ =

area of emitting surface

S =

m²

spectral range

dλ =

Boltzmann constant

k =

1.381E-23

J/K

temperature of radiating body

T =

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