Physics Unit 2 definitions
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Define the period of a wave
The time taken for a complete oscillation of a wave
Define what is meant by 'in phase'
Being at the same point of oscillation cycles at the same time.
The spreading out of waves when they meet obstacles, e.g the edges of a slit.
Define the frequency of a wave
The number of complete oscillations that pass a given point in one second.
Define a longitudinal wave.
When the oscillations of the particles are parallel to the propagation of the wave
State the principle of superposition
When waves from 2 or more travel in the same region, the resultant displacement at any point is the vector sum of the displacements of the two waves
The maximum value of displacement of a particle from its equilibrium position
Define a transverse wave
The particle oscillations are at right angles to the propagation of the wave
When a wave passes obliquely from one medium to another, it changes direction
The number of free electrons per cubic metre
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