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What's that buzzing noise?

Topic: Sound

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. In this activity 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.

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