Howard Stapleton has invented the Mosquito, a device that makes an annoying noise that only teenagers can hear. The device emits a very high frequency tone and once over 25 we lose the ability to hear this frequency range.
Children design a mobile phone with a ringtone that only children can hear. They learn that humans have a different hearing range to animals. In an extension activity they learn that pitch can be changed by varying the length of a column of vibrating air. They use this knowledge to design a dog whistle.
- that the maximum pitch we can hear decreases as we age
- that animals can hear sounds of a much higher pitch than adults
Children will learn:
- to use information about hearing ranges and pitch to decide what sounds human and animals can hear
- that a very short whistle will give a very high pitched sound and a long whistle will give a lower pitched sound
These resources were initially developed in partnership with the Centre for Science Education, Sheffield Hallam University.