Core Practical: Investigating the Speed of Sound
2 guided lessons · 18 checks · 3. Waves → Sound
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Timing sound over a measured distance
The oldest way to catch the speed of sound is also the simplest: make a sharp bang a known distance away, start a stopwatch when you see the bang and stop it when the sound reaches you. Distance divided by time then gives a value close to the accepted 340 m/s.
What you know already
This core practical measures the speed of sound in air twice: once with a stopwatch over a long measured distance, and once with two microphones and an oscilloscope over a short one. Comparing the methods is where the evaluation marks live, because one of them is fighting human reaction time.
Key points of understanding
- The experiment measures how fast sound crosses a known gap between two people.
- A trundle wheel measures a distance of about 100 m between two people.
- One person bangs two wooden blocks together; the other starts a stopwatch on seeing the bang and stops it on hearing it.
- The timing is repeated several times and averaged, then repeated at several distances.
- Speed is calculated from distance divided by time, giving about 340 m/s in air.
Measuring the speed of sound directly between two points
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1.Timing sound over a measured distance
The oldest way to catch the speed of sound is also the simplest: make a sharp bang a known distance away, start a stopwatch when you see the bang and stop it when the sound reaches you. Distance divided by time then gives a value close to the accepted 340 m/s.
Measuring the speed of sound directly between two points
Key points
- The experiment measures how fast sound crosses a known gap between two people.
- A trundle wheel measures a distance of about 100 m between two people.
- One person bangs two wooden blocks together; the other starts a stopwatch on seeing the bang and stops it on hearing it.
Guided content from the SME authoring corpus — note rn_SCPfx5yXVvZQSpgw, pinned at 8f834fff738f · promoted SyllabAI/syllabai-resources b3caaaa90c5e
