Final answer:
Microwave ovens were accidentally discovered in 1946 as a spin-off from World War II radar technology. They use high-frequency microwaves (2.45 GHz) to heat food by causing polar molecules to rotate, generating heat. This technology quickly became popular in US households.
Step-by-step explanation:
Microwave Ovens were actually discovered by accident in 1946. This serendipitous invention was a byproduct of World War II radar technology. Microwave ovens operate by producing microwaves electronically at a frequency of 2.45 GHz, which are generated by accelerating electrons. These microwaves create an alternating electric field inside the oven, which preferentially causes polar molecules such as water in the food to rotate, leading to the generation of heat. The first microwave ovens were referred to as Radaranges due to their roots in radar technology.
The high-frequency microwaves of 2.45 GHz ensure that the food absorbs energy efficiently, heating it quickly and evenly. As a result of their efficient and safe method of heating food through radiation, microwave ovens became an instant hit in US households. The compact and convenient home appliance was part of the wave of consumer products that emerged in the post-war era, reflecting the profound impact of technology on everyday life.