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physics waves - Coggle Diagram
physics waves
definitions and terminology
progressive waves
one which transfers energy rfom one point to another without transferring material
frequency
the number of waves per second
amplitude
the maximum displacement of a wave from its equilibrium position
transverse wave
a wave in which the oscillations are perpendicular to the direction of wave travel and energy transfer
principle of superposition
when two or more waves meet the total displacement at that point is equal to the sum of the individual displacements of each wave at that point
polarisation
the restirction of vibration to a single plane
coherent waves
waves that have the same frequenct and a constant phase difference
refraction
the change in direction of a wave when entering a medium of different optical density at a non-zero angle of incidence
critical angle
the angle of incidence which gives an angle of refraction of 90 degrees
uses of polarising filters
polarising material, in polaroid sunglasses, the em waves are polarised in the same direction as the long chain molecules in the polarising material are much mere readily absorbed by the electrons than at other orientations, causing less to be transmitted.
ensuring strong received signals from radio transmitters- transmitters emit polarised waves, you want your receiving aerial in the same direction as the polarisation of the wave so the electrons in the receiver absorb the wave.
the formation of a stationary wave