What are waves• A means of transferring energy from one place to another.• Two types of wave: – Transverse, (eg light waves, water waves) – Longitudinal, (eg sound waves)
Transverse Waves• Vibrates or oscillates at right angles to the direction in which the energy is moving.
Longitudinal Waves• Vibrations or oscillations are along the direction in which the energy is moving
Describing Waves• Three ways to describe a wave: Amplitude (A) Wavelength (λ) Frequency (f)
Amplitude• Waves cause particles in a substance to move from their resting position.• The maximum movement of the particles from this position is called the Amplitude (A).
Wavelength• The distance from a point on one wave and the corresponding point on the next (eg from crest to crest) is called the Wavelength (λ).• Wavelength is measure in metres (m).
Frequency• The number of waves produced each second, or passing a particular point each second is called the Frequency of the wave (f).• Frequency is measured in Hertz (Hz).
Wave Period• The time it takes for a source to produce one wave is called the period (T) of the wave.• It can be calculated from the frequency: T= 1 frequency
The Wave Equation• There is a relationship between the wavelength (λ), the frequency (f) and the wave speed (v): Wave speed = frequency x wavelength v =fxλ v• The wave speed is measured in metres per f X λ second (m/s)