Question

sound need a medium to travel suggest a reason .

Answer 1

A mechanical wave requires an initial energy input... In contrast, electromagnetic waves requires no medium but can still travel through one. Since a vacuum is defined as lacking a medium, then sound and correspondingly, mechanical waves cannot propagate through a vacuum. Thank you, i hope so it helps u and plz mark my answer as brainlist

Answer 2

because the sound that we hear by our ears that sound interact in our pinna