Microwaves, extremely short radio waves. The term is usually used to refer to radio waves with a wavelength between 30 centimeters and 3 millimeters—that is, with a frequency between 1 gigahertz (billion hertz) and 100 gigahertz.
WHAT'S INSIDE: PHYSICAL SCIENCE
Physical science is the study of the physical world around you. Learn about everything from electricity to magnetism in this section.
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Matter
Everything in the universe is comprised of matter. Check out these articles for a better understanding of matter and how it affects you.
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