JAMB - Physics (2025 - No. 66)
The speed of sound in air is 60 m/s. How far from the centre of a storm is an observer who hears a thunder clap 4s after the flash of the lightning?
140m
100m
340m
240m
설명
Speed of sound = 60 m/s
Time delay = 4 s (light travel time is negligible)
Distance = speed × time = 60 × 4 = 240 m