motion of source

The motion of a source refers to how it moves through space over time. When a source emitting waves (like sound, light, or radio signals) moves, the waves it produces are affected, changing their properties. For example, as a source moves towards you, the waves compress, making the sound or light appear shifted towards higher frequencies — a phenomenon called the Doppler effect. Similarly, moving away stretches the waves, lowering their frequency. The source's velocity and direction determine these changes, which are essential in understanding how signals and waves behave in various contexts.