The Doppler Effect is like when an ambulance or a police car goes by with its sirens on. The sound of the siren gets higher and louder as it comes closer to you, and then it gets lower and quieter as it goes farther away. This happens because sound travels in waves, just like ripples in a pond when you throw a stone. When something is moving towards you, it pushes the sound waves together, making them sound higher and louder. But when it's moving away, it stretches the waves out, making them sou

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