Blackbody Radiation. A blackbody is something that absorbs all radiation that shines on it Are all blackbodies black? no!! imagine a box full of lava. A constant temperature blackbody (a.k.a. a very precise oven). Order your own blackbody online. Blackbodies and Astronomy.
A constant temperature blackbody
(a.k.a. a very precise oven)
Order your own blackbody online
Iν(T) is the specific intensity, depends on T and ν
T is temp in Kelvin (Kelvin = Celsius + 273.2)
his Planck’s constant: 6.636 x 10-34 J s
k is Boltzmann’s constant 1.38 × 10-23 m2 kg s-2 K-1
c is the speed of light
Alternatively, νm/ T = 5.88 x 1010Hz K-1, where νmis the
frequency at which Iνpeaks.
Temperatures of stars and planets are measured using Wien’s law.
A high-density gas cloud produces a continuous spectrum