Measuring the speed of sound

In this investigation, students measure distance and time in order to calculate the speed of a sound wave.

The investigation supports the science capability ‘Gather and interpret data’. It also provides a real-world context in which to practise mathematical skills.

Set-up for measuring the speed of sound using an echo

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Sound travels to a distant building and returns as an echo. Students use a timing app and distance to calculate the speed of sound.

Rights: The University of Waikato Te Whare Wānanga o Waikato

By the end of this investigation, students should be able to:

• calculate the speed of sound

• explain why we see a lightning bolt before we hear the thunder.

Equipment required includes:

• sound-making device (wooden clapper)

• device with timing software app

• tape measure

• an outdoor space of at least 150 metres with a building at one end.

Download the Word file (see link below).

Related content

This article is part of an article series:

• Sound – understanding standing waves

• Sound – visualising sound waves

• Sound – resonance

• Sound – wave interference

• Sound – beats, the Doppler effect and sonic booms

with the accompanying investigation:

• Investigating sound wave resonance

Learn more about sound with these articles:

• Hearing sound

• Sound on the move

• Measuring sound