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KS3 Questions on Sound

Q4.

(a) When people speak, sounds are made by their vocal cords. How do the vocal cords make a sound?

1 mark

(b) The astronauts who landed on the Moon had to wear spacesuits. The spacesuits were filled with air because there is a vacuum on the Moon.

(i) The astronauts had radios in their helmets. Without the radios, they could not hear each other speaking. Why does sound not travel on the Moon?

1 mark

(ii) If the radios broke, the astronauts could put their helmets together so that they touched. Then they could hear each other's voices. Why could they hear each other's voices when their helmets were touching? .

1 mark

Total 3 marks