direction of travel/propagation is parallel to direction of vibration
e.g. sound
transverse waves:
direction of travel/propagation is perpendicular to direction of vibration
e.g. EM waves, waves on a string
all EM waves travel at 3 x 10^8 ms^-1 in a vacuum
polarisation: restricts the oscillations of a transverse wave to one plane
this is proof that the waves of the EM spectrum are transverse. if they were longitudinal waves the oscillations would not be restricted by the polarising filter
applications of polarisers:
TV aerials get the best reception when they point to the transmission source so they absorb the maximum amount of the radio waves
polaroid glasses reduce unwanted reflected light
polaroid material
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