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Doppler Effect
by King Wai Ngan
# 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

### Moving observer

## 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

### Source moving away from observer

## 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

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Change of wavelength

Change of wave speed

Sound wave has higher frequency

Sound wave has lower frequency