Sound review (CIE KS3 Year 7)

Sound is made by ... ?

• Moving objects

• Vibrating objects

• Frequency

• Speakers and microphones

Sound cannot be heard ... ?

• When I wear headphones

• Underwater

• In a vacuum

• When I'm asked to clean my room

Sound is ... ?

• Particles bumping into each other

• Waves of energy travelling from one place to another

• The vibration of particles

• All the above.

When sound bounces of a hard surface and is heard again, it is called ... ?

• Annoying

• An echo

• A rebound

• A reflection

Dolphins search for fish by ... ?

• Using their eyes and finding the biggest one possible.

• Diving deep where there are more.

• Asking their friends.

• Sending out a sound wave and listening for its echo.

We can use echolocation and measuring the time taken for an echo to return to find the ... ?

• Distance from a surface/object.

• Find my friend Mr. Bat.

• Biggest shoal of fish.

• How deep the ocean is.

Why is a slinky useful when modelling sound waves?

• It shows the particles moving to and fro, but returning back to their original location.

• It is fun.

• It shows vibrations of particles with each loop.

• It shows air moving forwards from the source of the sound.

Why can't sound travel through space or a vacuum?

• It doesn't like the cold.

• It needs particles to move to and fro.

• It is too loud and needs company.

• Nothing makes sound out in space.

Which practical demonstrates how sound cannot travel through a vacuum?

• Slinky.

• Tuning fork in water.

• Echolocation clapping.

• Bell jar.

If air gets warmer the particles spread out more. This means sound travels more slowly through it.

• True.

• False.

• Not enough information.