Electromagnetic waves Flashcards
an electric charge produces an
electric field.
An oscillating charge will produce
oscillating electric field
Electromagnetic waves or electromagnetic radiations, are produced
oscillating electric charges
electromagnetic waves are
transverse waves
v =
vacuum
f =
frequency
upside down v=
wavelength
Is the continuous range of electromagnetic waves arranged in order of frequency or wavelength.
The electromagnetic (EM) spectrum
Discovered by Heirich Hertz in 1887 longest of all electromagnetic waves, ranging from 10 m to 10 m. The frequency of these waves ranges from 30 kHz to 3000 MHz.
Radio waves
acronym for radio detenction and ranging
Radar
in the EM spectrum lies somewhere from 300 MHz to 300 GHz, with wavelength corresponding to 10 m to 10 m. James Clerk Maxwell is credited for discovering in 1864.
considered as high-frequency radio waves and are mainly used for communication, especially from 2 GHz to 40 GHz. They were mostly used for long-distance telephone calls before the introduction of optical fibers. They are also used to send signals for cable television as well as video or audio feeds from production vans to broadcast stations,
Microwave
Infrared means
“below red.”
have a lower frequency than the red part of the visible light. Their frequencies range from 3x 10” Hz to 4 x 10” Hz, with wavelengths ranging from 7.5 x 10 m to 10 m. Sir William Herschel, a British astronomer, discovered these rays in 1800.We do not seebut we feel it as heat. are used in remote controls for television sets, burglar alarm systems, night vision cameras, and certain types of thermometers. Most computers, laptops, palmtops, and printers are equipped with infrared data association ports that enable us to transfer and print data without connecting them with cable.
Infrared Waves
in the range of 4 x 104 Hz to 8x 10” Hz with corresponding wavelengths of 4 x 10 m to 8 x 10 m are the only ones seen by our naked eye.
Visible Light
The sequence of colors of visible light from longest to shortest may be remembered by the acronym
ROYGBIV