What are waves?
1 mark · EasyA bell rings inside a vacuum chamber, but you cannot hear it from outside. What does this show about how sound waves transfer energy?
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Sound waves need a material (medium) to transfer energy.
Also accept: Sound waves need a medium/material to transfer energy; Sound cannot travel without a material to carry energy
Common mistakes: Sound travels through vacuum
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Marking points
B1 · 1 mark · States that sound waves need a material/medium to transfer energy.
Worked solution
Sound needs a material (medium) to transfer energy; in a vacuum, there is no medium, so sound can't be heard.