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Physical Science - Chapter 21
Electromagnetic Energy
21A Electromagnetic Waves
%%Electromagnetic Wave%%: a disruption in an electromagnet field that carries energy, even through the vacuum of space
%%Photon%%: a wave bundle, or particle, of electromagnetic energy
21B The Electromagnetic Spectrum
%%Electromagnetic Spectrum%%: the entire range of all electromagnetic wave s
Electromagnetic Spectrum
%%Radio Wave%%: the longest and lowest energy type of electromagnet wave
Frequency: 3 Hz to 300 GHz
Wavelengths: 100 000 km to 1 mm
Uses: navigation, communication
%%Microwave%%: a wave from the upper end of the radio wave band
Frequency: 300 MHz to 300 GHz
Wavelengths: 1 m to 1 mm
Uses: navigation, communication, astronomy, cooking
%%Visible Light%%: electromagnetic waves that humans can see
Frequency: 430 THz to 790 THz
Wavelengths: 700 nm to 380 nm
%%Ultraviolet Wave%%: an electromagnet wave that is just beyond (more energetic than) violet visible light
Frequency: 790 THz to 30 PHz
Wavelengths: 380 nm to 10 nm
Uses: medical treatment, dentistry, killing bacteria
%%X-ray%%: photograph taken with x-ray
Frequency: 30 PHz to 30 EHz
Wavelength: 10 nm to 10 pm
Uses: medical imagery, transportation security, nondestructive inspection
%%Gamma Ray%%: a high-energy photon that is emitted from a nucleus when a radioactive isotope experiences gamma decay
Frequency: above 30EHz
Wavelengths: 10 pm down to 1 fm
Uses: medical treatment, astronomy
Using Electromagnetic Waves
%%Amplitude Modulation%%: the process of putting information into a radio wave by changing, or modulating, the amplitude of the wave
%%Frequency Modulation%%: the process of putting information into a radio wave by changing, or modulating, the frequency of the wave
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