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Waves

LC Physics

TermDefinition
Mechanical Wave Transfer of energy through a medium.
Electromagnetic Wave Transfer of energy without the need of a medium.
Transverse Wave Direction of vibration of the wave is perpendicular to the direction in which the wave travels.
Longitudinal Wave Direction of vibration of the wave is parallel to the direction in which the wave travels.
1 Hertz 1 cycle per second.
Reflection Bouncing of waves of an obstacle.
Refraction Changing direction of wave as it travels from one medium to another.
Diffraction The sideways spreading out of waves into a region beyond a gap or around an obstacle.
Interference When two waves meet producing a new wave.
Constructive Interference When two waves meet and the amplitude of the resulting wave is greater than the amplitudes of each of the individual waves.
Destructive Interference When two waves meet and the amplitude of the resulting wave is less than the amplitudes of each of the individual waves.
Out of Phase When two waves are completely out of phase one is half a wavelength ahead of the other. Results in total destructive interference.
Coherent Sources When two periodic waves with the same frequency have a constant phase difference.
Polarisation When the wave is vibrating in one plane only.
Stationary Wave No net transfer of energy. Conditions needed: 1. Two periodic waves moving in opposite directions. 2. Both waves have same frequency and amplitude.
Doppler Effect Apparent change in frequency of waves due to the motion of the source or observer.
Created by: mduffy13
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