Applications of electromagnetic waves

?

Radio waves are used for radio and (terrestrial) television communications.  This is because they are able to travel long distances without being absorbed.  Longer wavelengths can also spread out between hills.  This is known as diffraction.  Furthermore, radio waves can reflect off a layer of charged particles in the atmosphere - known as the ionosphere - which allows us to send radio waves very long distances around the Earth.

Microwaves are used for heating food because most foods contain a lot of water molecules and water molecules absorb the energy of microwaves, causing the temperature of the food to increase.  Microwaves are also used to communicate with satellites in space because they can pass through the Earth's atmosphere without being reflected or refracted.

Infrared is emitted by electrical heaters and is also used to cook food in ovens because the energy of infrared is easily absorbed by the surface of other objects. …

Comments

No comments have yet been made