Physical Science - Chapter 21

Electromagnetic Energy

%%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

%%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

%%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