# Waves

WAVEs

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## Waves Intro

• What do waves do?
• What are the two types of waves?
• Write definations for the two types of waves with image?
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## Wave Intro

All travelling waves transfer energy through a medium without that medium travelling. Waves transfer Energy The energy is moved as an osillation. This leads to two types of waves:  -

• longitudinal waves
• transverse waves

Longitudinal Waves: -  A medium oscillates in the same direction as that of energy. Transverse Waves: - A medium oscillates at right angles to the direction of energy. 2 of 4

## Wave Terms

Define: -

• Intensity
• Amplitude
• Wave length
• Relationship between Intensity and amplitude?
• Frequency
• Period
• Wavefront
• Ray
• Compression
• Rarefraction

With a diagram

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## Wave Terms

Intensity: - the energy transferred per second per unit area.

Amplitude (A): - The size of the oscillation measured from the midpoint to the maximum oscillation.

Wavelength (λ): - the length of the wave measured from maximum to maximum, crest to crest, trough to trough, compression to compression, rarefraction to rarefraction.

Intensity α (Amplitude)2

Wavefront: - A wavefront is a line of crests

Ray:  - A ray is a narrow band of wavefronts

Compression: - In a longitudinal wave when the medium is squeezed together we call it compression.

Rarefraction: - In a longitudinal wave when the medium is spread out we call it rarefraction.

Frequency (f) - the number of waves produced per second. Unit is Hz

Period (T): - the time taken to produce a single complete wave. Unit is second 4 of 4