Project 4 — Carry out a simple activity

Last updated at July 3, 2026 by

Project 4
Carry out a simple activity to measure the speed of sound with a friend in a large open ground (200 m or more), using balloons and a stopwatch: time the gap between seeing a balloon burst and hearing it, then divide the measured distance by the average time.
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Because light reaches you almost instantly, the timed gap is the sound’s travel time. Dividing distance by the average time gives a speed close to 346 m/s at 25 °C. Repeat and average to reduce error.

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CA Maninder Singh

CA Maninder Singh is a Chartered Accountant with 16+ years of practical experience and 20+ years of teaching experience. At Teachoo, he simplifies Accounts, Tax and GST with step-by-step examples so students can apply concepts confidently in exams and real life.

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