Sounds

Draw the direction both waves are travelling in.

Answer explanation

The arrow should go in the same direction as the movement of energy.

Mark the areas of compression (C) and expansion (E) on this sound wave model.

Answer explanation

Where the slinky is closer together (dark areas) that should be labelled compression (C). Where the slinky is further apart (lighter) are the areas of expansion (E)

When something vibrates it makes the air particles around it move......

• backwards and forwards.

• up and down

• Diagonal

• in all directions

Sound waves are ------------ (the oscillations are in the same direction as the wave)

What happens to the sound when we increase the vibrations?

• It gets softer

• It gets louder

• It has a higher pitch

• It has a lower pitch

Sounds need a ------ to travel through.

Sounds can't travel through a vacuum because the are no --- --------- to vibrate

Sound travels quickest through .....

• gases

• liquids

• solids

• a medium

The longer the wavelength the ----- the frequency and the lower the -----

The shorter the wavelength the ------ the frequency and the ------ the pitch