Y8 Sound and light revision

Sound travels in air because:

• air particles stay still.

• the wind blows it.

• particles pass on vibrations.

• electricity sends it through the air.

The pitch of a sound is:

• how high or low it sounds.

• how loud or quiet it is.

• how much energy it carries.

• how long the sound lasts.

Frequency:

• is the height of the waves.

• is the number of waves per second.

• is measured in metres.

• affects how loud sound is.

A loud sound is produced by waves with:

• high pitch.

• high frequency.

• large amplitude.

• small amplitude.

Which statement is not true?

• light and sound both travel as waves.

• sound travels at the same speed as light.

• light travels faster than sound.

• light and sound can both be reflected.

Sound can travel through:

• gases and space.

• vacuum

• solids and liquids only.

• solids, liquids and gases.

Which does sound travel through the quickest?

• air

• water

• iron

• space

Sound travels fastest in solid materials which have particles that are:

• wide apart.

• close together.

• very hot.

• able to move around freely.

Which of these statements is true?

• Light travels in straight lines.

• Light is stopped when it meets solid object.

• Light does not travel in straight lines.

• Light will only travel for about 2000km before it stops.

Shadows are formed because:

• light will only travel certain distance before it stops.

• substance called ‘darkness’ collects behind some objects.

• some objects do not give out light in all directions.

• light cannot go through some objects.