Question

Which is not true about S waves?

They travel more slowly than P waves can travel.


They cannot be transmitted through water or air.


They change the volume of material by compression and expansion.


They shake particles at right angles to the direction the waves travel.

Answer 1

They change the volume of material by compression and expansion is your answer:)

Answer 2

S-waves or also called as secondary waves and shear waves is one of the type of elastic waves and have many characteristics but according to your choice the fact or sentence that is not true about S-waves is that they change the volume of material by compression and expansion. S-waves didn't change the volume of the material by compression and expansion.