# 3 Waves - iGCSE Physics Edexcel

3.1 use the following units: degree (°), hertz (Hz), metre (m), metre/second (m/s) and second (s)
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Wavelength is the distance from a point on one wave to the same point on the next wave.
IE peak to peak

Amplitude of a wave is its height, measured from the middle of the wave to its top

Wavefront is a way of picturing waves from above: Each wavefront is used to represent a single wave.

The frequency of a wave is the number of waves passing a point every second
Waves per second
Measured in Hertz (HZ)

Timeperiod is time taken for a wave to pass through a point
Measured in seconds Relfection
-When waves hit an object, such as a barrier, they can be reflected
-Angle of incidence = angle of reflection
i = r

Refraction
-When waves enter a different medium, their speed can change.
-Wavelength can increase or decrease
-Direction changes

If the waves slow down:
-the waves will bunch together causing wavelength to decrease. -Waves travel closer to the normal

If waves speed up:
-Waves spread out, causing the wavelength to increase
-Waves turn away from the normal