The time interval between a lightning flash and the first sound of thunder is 5 s. If the speed of sound in air is 330 m s-1 , find the distance of flash from the observer.

Time interval (t) = 5 s

Speed (V) = 330 m s^-1

distance (d) = ?

V = Distance\over Time

Substituting the values, we get,

330 = d\over 5

⇒ d = 330 × 5 = 1650 m

Therefore, the distance of flash from the observer = 1650 s.