Momentum with the principle of the Doppler effect applied.

The Doppler effect is used in some types of radar, to measure the speed of detected objects. A radar beam is fired at a moving target (for example, a car, as in the radar's use of radar to detect the speed of vehicles) as it approaches or moves away from the radar source. Each successive radar wave has to travel further to reach the car, before being reflected and detected again near the source. As each wave has to move farther, the distance between each wave increases, producing an increase in wavelength. In some situations, the radar beam is used with the car in motion and, if it approaches the observed vehicle, then each successive wave travels a shorter distance, producing a decrease in wavelength. In any of these situations, the Doppler effect calculations allow to determine with precision the speed of the vehicle observed by the radar.

Inputs

• Periods
• Doppler

Author

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