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Doppler Effect by Mind Map: Doppler Effect
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Doppler Effect

2. Moving Source

What?

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

Principle

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

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

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

Why?

Moving source

Change of wavelength

Moving observer

Change of wave speed

Formula

1. Original wave equation: v = fλ

3. Moving Observer

4. General Form

Who?

Doppler Effect was proposed by an Austrian physicist Christian Doppler

Concept

Source moving towards observer

Sound wave has higher frequency

Source moving away from observer

Sound wave has lower frequency

Examples

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

Determine the speed of car by using radar gun

Gauge the line-of-sight velocities for stars