Question

what type of low electromagnetic wave does a radar gun use? microwaves x - rays infrared waves

Explanation:

Radar guns operate based on the Doppler effect. Microwaves are a type of electromagnetic wave with relatively long wavelengths (compared to X - rays and infrared in this context). X - rays have very short wavelengths and are used in medical imaging (to penetrate tissues) and security screening (to see through objects). Infrared waves are often associated with heat detection (like in night - vision goggles that detect heat signatures). Radar guns use microwaves because microwaves can be transmitted, bounce off moving objects (like cars), and the change in frequency (due to the Doppler effect) can be measured to calculate speed.

Answer:

microwaves