CDS 2018 PYQ with Answer — Sound waves cannot travel through a

2018 · Q8

Sound waves cannot travel through a

General KnowledgePhysics

Acopper wire placed in air.
Bsilver slab placed in air.
Cglass prism placed in water.
Dwooden hollow pipe placed in vacuum.

Explanation

Sound is a mechanical wave and needs a material medium to propagate. A wooden hollow pipe placed in vacuum contains no air or other matter, so there is nothing to carry the vibrations. A copper wire, a silver slab and a glass prism are all material media through which sound travels readily. Hence sound cannot travel through the pipe placed in vacuum.