What are waves?
2 marks · NormalA diagram below shows water waves moving from the centre outward after a small object is dropped into a pond.
Describe what the diagram shows about how energy is transferred but not matter.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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Wavefronts (energy) move outward but the object/remains at centre (no matter transfer).
Also accept: Energy moves outwards in wavefronts, but water (and the object) stay in the same place
Common mistakes: Saying water moves with the wave
Show mark scheme and worked solution
Marking points
B1 · 1 mark · Identifies wavefronts show energy transfer outward.
B2 · 1 mark · States object (and water) remains at the centre; matter does not move out.
Worked solution
The circles show wavefronts (energy) moving outward. The central object stays in place, showing no matter moves with the wave.