A microwave oven or simply microwave is an electric oven that heats and cooks food by exposing it to electromagnetic radiation in the microwave frequency range. This induces polar molecules in the food to rotate and produce thermal energy in a process known as dielectric heating. Microwave ovens heat foods quickly and efficiently because excitation is fairly uniform in the outer 25–38 mm (1–1.5 inches) of a homogeneous, high-water-content food item.
A modern microwave oven (2022)
The cavity magnetron developed by John Randall and Harry Boot in 1940 at the University of Birmingham, England
Microwave ovens, several from the 1980s
Raytheon RadaRange aboard the NS Savannah nuclear-powered cargo ship, installed circa 1961
The Raytheon Company was a major U.S. defense contractor and industrial corporation with manufacturing concentrations in weapons and military and commercial electronics. It was previously involved in corporate and special-mission aircraft until early 2007. Raytheon was the world's largest producer of guided missiles. In April 2020, the Raytheon Company merged with United Technologies Corporation to form Raytheon Technologies, which changed its name to RTX Corporation in July 2023.
Entrance to Raytheon's headquarters complex in Waltham, Massachusetts
A Raytheon Tomahawk Block IV cruise missile during a U.S. Navy flight test at NAWS China Lake, California (November 10, 2002)
The 3DELRR long-range radar system in 2021
A PAVE PAWS Early Warning Radar System built by Raytheon, based at Clear AFS, Alaska