Sound produced by a thunderstorm is heard $10\ s$ after the lightning is seen. Calculate the approximate distance of the thunder cloud. $(Given\ speed\ of\ sound=340\ ms^{-1})$.

AcademicPhysicsNCERTClass 9

The sound of a thunderstorm is heard after light. It is because the speed of light $(3\times10^8\ ms^{-1})$ is more than the speed of the sound.

Speed of the sound $v=340\ ms^{-1}$

Time taken to reach the sound $t=10\ s$

Therefore, distance between the thunder cloud and observer $s=vt$

$=340\ ms^{-1}\times 10\ s$

$=3400\ m$

$3.4\ km$

Updated on 10-Oct-2022 13:28:53