What are wavefronts?
2 marks · NormalState what is meant by a wavefront and explain how it relates to the vibrations of a wave.
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A wavefront is a line where all vibrations are in phase and the same distance from the source; it connects points on a wave that vibrate together.
Also accept: A surface joining points of equal phase on a wave
Common mistakes: Confusing wavefront with crest or trough; Omitting reference to phase
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Marking points
B1 · 1 mark · Gives correct definition of a wavefront (a line/surface where vibrations are in phase/equidistant from source)
B2 · 1 mark · Links wavefront to vibrations/oscillations (e.g., 'vibrate together', 'in phase')
Worked solution
A wavefront is a line where all the vibrations are in phase, so particles on a wavefront vibrate together and are the same distance from the wave source.