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Doppler Effect
by King Wai Ngan
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Doppler Effect

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2. Moving Source

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What?

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Change in frequency of a wave for an observer moving relative to the source of the wave

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Principle

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1. Moving source approaching a stationary observer, the receive pitch will then become higher and vice versa

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2. A moving observer approaching a stationary source, the reveived pitch will then become higher and vice versa

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3. When both of the source and observer moving towards with each others, the received pitch will then become higher and vice versa

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Why?

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Moving source

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Moving observer

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Formula

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1. Original wave equation: v = fλ

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3. Moving Observer

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4. General Form

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Who?

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Doppler Effect was proposed by an Austrian physicist Christian Doppler

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Concept

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Source moving towards observer

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Source moving away from observer

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Examples

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When an ambulance is approaching, the whistle has a higher pitch than normal

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Determine the speed of car by using radar gun

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Gauge the line-of-sight velocities for stars

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