What electromagnetic wave is used in speed guns?

The microwaves reflect back from oncoming vehicles and are detected by a receiver in the radar gun. The frequency of the reflected waves is used to compute the speed of the vehicles.

Most weather radars have wavelengths that range between 0.8 centimeters (cm) and 10.0 cm. Generally short wavelengths mean smaller and less expensive equipment. Short wavelength radars are more effective in detecting small particles such as cloud droplets and drizzle drops.

A Radar Gun is a electronic tool which uses electromagnetic waves called called radio waves to detect and locate moving or still objects. 2. Radar guns are often used as police radar, Doppler radar, and commonly used in baseball for pitching.