one which transfers energy rfom one point to another without transferring material

the maximum displacement of a wave from its equilibrium position

a wave in which the oscillations are perpendicular to the direction of wave travel and energy transfer

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

waves that have the same frequenct and a constant phase difference

the change in direction of a wave when entering a medium of different optical density at a non-zero angle of incidence

the angle of incidence which gives an angle of refraction of 90 degrees

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.