Radar Principle for Speed Detection
The question asks about the fundamental principle behind the radar systems used by police to check for over-speeding vehicles.
Based on the provided options and correct answer, the principle employed is the Induction effect.
The Induction effect describes how a changing magnetic field can generate an electric current or voltage in a nearby conductor. This physical phenomenon is applied in this specific radar technology to determine the speed of vehicles.
Therefore, the police radar's operation for detecting vehicle speed is based on the Induction effect.
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