text: In a classic example of inverse Compton scattering, photons in this region of the spectrum gain energy through the redshift-independent SZ effect.
full_question: In a classic example of inverse Compton scattering, photons in this region of the spectrum gain energy through the redshift-independent SZ effect. The selection rule delta J equals plus or minus one applies to rotational spectroscopy using this type of radiation. This radiation has frequency slightly greater than ultra-high or super-high frequency radiation. Radiation at (*) 2.7 Kelvin has its maximum intensity wavelength in this region of the spectrum. A cavity magnetron produces this type of radiation. At Bell Labs in New Jersey, Penzias and Wilson discovered a nearly constant spectrum of this radiation in the universe left over from the Big Bang. For 10 points, name this form of radiation which is slightly less energetic than infrared and is often used to cook food. 
first_sentence: In a classic example of inverse Compton scattering, photons in this region of the spectrum gain energy through the redshift-independent SZ effect.
raw_answer: Microwaves [prompt on radio waves]