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Basic electronic circuit includes components such as resistors, capacitors and inductors.
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Angstrom is the unit for measuring electromagnetic waves.
Electromagnetic Radiation
Electromagnetic radiation Light, ultraviolet and infra-red rays, radio waves and X-rays, are all forms of electromagnetic radiation, and differ only in their wavelengths. The unit of length for measuring electromagnetic waves is the Angstrom, named after the 19th-century Swedish physicist Anders Angstrom. An Angstrom is equal to one hundred-millionth of a centimeter.
All forms of electromagnetic energy known to science can be arranged in order of wavelength in the electromagnetic spectrum. Visible light has a relatively small place in the spectrum, ranging from about 7600 Angstroms for red light to about 4000 Angstroms for violet light. Infra-red or heat rays are longer than red light in wavelength and are invisible. Ultra-violet X-rays and Gamma rays have shorter wavelengths than violet light and can only be detected using special photographic films. Much longer again than infra-red rays are short, medium and long radio waves.
The sun, the stars and other bodies in the Universe give off electro-magnetic radiations of many kinds. The Earth's atmosphere stops many of these reaching the ground, but it lets through others, such as light and short radio waves.
