Sound Waves
1 mark · EasySound waves cannot travel through a vacuum. Give a reason why.
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There are no particles in a vacuum to carry vibrations.
Also accept: Sound needs particles to travel, and a vacuum has none.
Common mistakes: Sound needs air; No answer
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Marking points
B1 · 1 mark · States that particles/materials are needed for sound to travel.
Worked solution
Because sound waves need particles to travel, and a vacuum has no particles.