Blackbody

Covered in section 12.4, a black body is an object/solid that absorbers all radiation it receives, emits perfectly (it has an emissivity of 1), and emits in all directions (diffuse emitter).

Blackbodies are:

• Perfect absorbers ()
• Perfect emitters ()
• Grey - radiation does not depend on (, ) (they are diffuse)
• Emitted radiation is a function of wavelength () and temperature ().

See ME3304 S24 Lecture Note (7) Radiation and 14E - 2nd Class for more information.

Equation 12.29 (blackbody spectral intensity):

See 14E - 2nd Class for details about this equation.

A comparison of a black body to a real surface can be found on Slide 32 of ME3304 S24 Lecture Note (7) Radiation.