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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. [1] This induces polar molecules in the food to rotate and produce thermal energy (heat) in a process known as dielectric heating .
Raytheon patented the dielectric heating device, naming it the Radarange, and in 1947 the first commercially available microwave oven hit the market. What started as an 800-pound device priced ...
Amana was acquired in 1965 by Raytheon, [7] which had invented the microwave oven in 1947, and introduced the commercial Radarange Model 1611 in 1954. [5] In 1967, Amana introduced a consumer model of the Radarange , the first popular microwave designed for home use.
The 3DELRR long-range radar system in 2021. In December 2010, Applied Signal Technology agreed to be acquired by Raytheon for $490 million. [21] In October 2014, Raytheon beat rivals Lockheed Martin and Northrop Grumman for a contract to build 3DELRR, a next-generation long-range radar system, for the USAF worth an estimated $1 billion. [22]
One significant difference is that a microwave oven uses the much lower frequency (and longer wavelength) of 2.45 GHz. The short millimeter waves used in ADS only penetrate the top layers of skin, with most of the energy being absorbed within 0.4 mm ( 1 ⁄ 64 inch), [ 15 ] whereas microwaves will penetrate into human tissue about 17 mm (0.67 in).
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