A progressive wave carries energy from one place to another without transferring any material.
For example:
1) electron-magnetic waves cause things to heat up
2) gamma rays knock electrons out of their orbit, causing ionisation
3) wave power can be used to generate electricity
PARTS OF THE WAVE
displacement- how far a point on the wave has moved from its undisturbed position
amplitude- maximum displacement
wavelength- the length of one whole wave, from crest to crest or trough to trough
period- the time taken for a whole vibration
frequency- the number of vibrations per second passing a certain point
phase difference- the amount by which one wave lags behind another
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