Question

a bomb explodes on the moon how long it take for the sound to reach the earth

Answer 1

We on the earth will not be able to hear the sound of the bomb blasting on the moon since sound requires a medium for its propogation. However , there is only vacuum in the space and there is no atmosphere , thus the sound waves will not travel only.

Answer 2

the sound of the explosion will not reach earth because there is no medium(vacuum) between earth and the moon and sound waves require medium to travel