Outcomes

Pupils can recall the hearing range of a human and determine whether a frequency lies within the range and understand that
Pupils understand that any sound wave with a frequency greater than 20kHz is known as ultrasound.
Pupils can recall different uses of ultrasound and can explain the idea of ultrasound scanning using an echo.
Pupils can describe how to measure the speed of sound using a clapping method and an electronic method.

Specification References

Carry out pupil hearing range experiment using speaker and signal generator. Pupils will probably bring up the The Mosquito at this point.

Demonstrate nature of sound waves
Show pupils the comparative speed of sound in solids, liquids and gases (set a large value for distance (≈50000m)).
Demonstrate that sound waves cannot travel through a vacuum.