Energy: Sounds

Sounds can travel ........

• only through solids

• only through liquids

• only through gasses

• through solids, liquids and gasses.

Sounds travel best through ..........

• solids

• liquids

• gasses

Sounds cannot travel in a vacuum so there is no sound in space.

• true

• false

We hear an echo when sound is .........

• reflected back by a surface

• absorbed by a surface

• passed through a surface.

Sound is reflected by .......

• hard materials

• soft materials

Sound is absorbed by .......

• hard materials

• soft materials

Which one of these materials would be best at blocking noises?

• tin foil

• foam

• paper

Foam is good a blocking sound because it is soft and it has air pockets in it which trap the sound waves.

• true

• false

Why are big rooms like cinemas covered in soft fabric?

• to make the room dark

• to make the room nicer

• to reduce sound reflection

• to increase sound reflection

Some animals use sound reflection to know their location.

• true

• false