Dictionary of Environmental Health
An ultra-high-frequency electromagnetic radiation with a free-space wavelength of between 0.001–0.3 m (i.e. a frequency of around 1–100 gigahertz – a gigahertz is equivalent to a billion cycles per second).
Microwaves propagate in straight lines and are not reflected by ionised regions in the upper atmosphere. They do not diffract readily around barriers (such as buildings) but do exhibit some attenuation when passing through trees or wooden structures. They are used for cooking, WIRELESS transmission and RADAR.
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