Radar speed gun is also known as radar or laser speed gun is a gun or gauge the speed of motor vehicles by the principle Dopler effect, is a device used in law enforcement and research traffic problems or to measure the speed of the ball and Smash in badminton.
The workings of radar speed
Working on the basis Dopler effect, where the tool / radar transmits a radar wave velocity that is directed at a moving object (car) and reflected back into the tool for later by this device measured the speed of the object.
Source: wikipedia.org
