Question

Which is not true for mechanical waves?
(1) Mechanical waves travel through vacuum
(2) Mechanical waves need elastic medium
(3) Example of mechanical waves is sound wave
(4) None of these​

Answer 1

Answer:

mechanical waves need elastic medium

Answer 2

Answer:

NOT TRUE :

Mechanical waves travel through vacuum

Explanation:

Because mechanical waves rely on particle interaction in order to transport their energy, they cannot travel through regions of space that are void of particles. That is, mechanical waves cannot travel through a vacuum