2.7 The phy module

The phy module contains a selection of physical constants, listed in Chapter 4. It also contains the following functions:

phy.Bv($$ν,T$)$
The phy.Bv($$ν,T$) function returns the power emitted by a blackbody of temperature $T$ at frequency $ν$ per unit area, per unit solid angle, per unit frequency. $T$ should have physical dimensions of temperature, or be a dimensionless number, in which case it is understood to be a temperature in Kelvin. $ν$ should have physical dimensions of frequency, or be a dimensionless number, in which case it is understood to be a frequency measured in Hertz. The output has physical dimensions of power per unit area per unit solid angle per unit frequency. $

phy.Bvmax($$T$)$
The phy.Bvmax($$T$) function returns the frequency at which the function Bv($ν,T$) reaches its maximum, as calculated by the Wien Displacement Law. The inputs are subject to the same constraints as above. $