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The Doppler Effect is the change in frequency or pitch of a sound or wave as the source and observer move relative to each other. When they move closer, frequency increases; when they move apart, frequency decreases, creating a noticeable shift.

A strong alternative word for important is significant. Other close synonyms include essential, crucial, vital, and notable. These words express the idea of something carrying great value, influence, or priority in a situation or decision-making process.