Microwave

"Microwaves are essentially high frequency radio waves and have wavelengths that range 1mm to 1m. Different wavelengths or bands of microwaves are used for different applications. Mid-wavelength microwaves can penetrate haze, light rain and snow, clouds, and smoke are beneficial for satellite communication and studying the Earth from space. Radar technology sends pulses of microwave energy and senses the energy reflected back." (Humboldt State University, 2014)

Sources

"Electromagnetic Spectrum". Humboldt State Geospatial Online, Humboldt State University. 2014.
http://gsp.humboldt.edu/OLM/Courses/GSP_216_Online/lesson1-2/spectrum.h….
Accessed February 1, 2019.

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