Describing waves
1 mark · EasyExplain how you can tell whether a wave is transverse or longitudinal by observing the movement of particles in the medium.
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In a transverse wave, particles move at right angles to the direction the wave travels. In a longitudinal wave, particles move in the same direction as the wave.
Also accept: Transverse: vibrations at right angles; longitudinal: vibrations parallel
Common mistakes: Stating both move the same way; Not mentioning direction related to wave
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Marking points
B1 · 1 mark · Correctly explains the difference in direction of vibration compared to wave movement.
Worked solution
If particles vibrate at right angles to wave movement, it is transverse. If they vibrate along (parallel to) the direction, it is longitudinal.