Wave properties for Edexcel GCSE Physics
This page covers the following topics:
1. Wave amplitude
3. Wave frequency
4. Wave period
5. Wave speed
A wave’s amplitude is a measure of its maximum height from its rest position.
The wavelength (λ) of a wave can be shown in a diagram or it can be calculated using the formula: Wavelength = wave speed ÷ frequency.
The frequency of a wave is the number of waves that pass a certain point per second. It can be calculated using the waves time period, or speed and wavelength.
The time period of a wave is the time it takes a full wave cycle to pass a certain point. It is often calculated using the equation: Time Period = 1 ÷ frequency.
Wave speed is the distance travelled by a wave divided by the time it takes. The wave equation can be used to work out the speed of a wave.
Using the diagram, calculate the speed of the wave shown if it has a wavelength of 25 m.
Speed = Wavelength ÷ Time Period. V = λ ÷ T, V = 25 ÷ 10 = 2.5 m/s.
The vertical displacement of a point on a wave doubles when the amount of energy in the wave doubles. What is the effect on the amplitude of the wave?
What is the definition of wavelength?
The wavelength is the distance covered by a full cycle of a wave, this is usually measured as the distance between two peaks or two troughs.
In the diagram each line represents the peak of a wave, what is the wavelength of the waves shown?
Define wave speed.
The speed of a wave is the amount of distance a wave has travelled in a given time interval.
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