Question

Why do the voices sound different when you listen to them through the wall?

Sound waves travel at different speeds when traveling through different
materials
Sound waves change frequency over long distances
Sound waves do not pass through solid materials
Your ear processes sound differently when it goes through a solid.

Answer 1

Sound waves travel at different speeds when traveling through different materials

Step-by-step explanation:

This is because in water the particles are more closely packed together, therefore making the sound travel faster and sound louder. The opposite is the same for air.