Physics · Oct / Nov 2025 · Paper 11 · Question 24

A firework is launched vertically from the ground. When the firework reaches a height of 360 m, the firework explodes, producing coloured light. A student on the ground below the firework incorrectly measures the time between seeing the coloured light and hearing the explosion. The student obtains a value of 1.8 s. What is the speed of sound that the student’s value suggests?

1. A200 m / s
2. B360 m / s
3. C400 m / s
4. D650 m / s

As printed in the paper