# Phenomena of Wave - Diffraction

Card 1: What is diffraction?

## Diffraction

Diffraction is the spreading of a wave when it travels through an opening or a small obstacle.

Card 2: Charecteristic of difraction

## Charecteristic of Diffraction

1. Wavelength does not change.
2. Frequency does not change.
3. Speed of diffracted does not change.
4. The amplitude of the wave decreases after diffraction.
Card 3: Diffraction happen when waves encounter an obstacle

## Diffraction happen when waves encounter an obstacle

• Waves spread to a wider area after passing the obstacle.
• The wavelength and the frequency remain unchanged after diffraction.
Card 4: Diffraction happen when waves pass through an opening

## Diffraction happen when waves pass through an opening

• Waves spread to a wider area after passing through the opening.
• The wavelength and the frequency remain unchanged after diffraction.
Card 5: Factors Affecting the Magnitude of Diffraction - Wavelength

## Factors Affecting the Magnitude of Diffraction - Wavelength

 Shorter wavelength - Diffracted less Longer wavelength - Diffracted more

In the diagram above, we can see that as the wavelength of a wave is longer, it will be diffracted more compare with a wave with shorter wavelegth.

Card 6: Factors Affecting the Magnitude of Diffraction - Size of Opening

## Factors Affecting the Magnitude of Diffraction - Size of Opening

 Small opening - Diffracted more Bigger opening - Diffracted less

Diagram above shows that the magnitude of diffration will reduce when the size of opening increases.

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