A person deep inside water cannot hear sound produced in air. Why?

We cannot hear the echo produced in a classroom.

Why cannot transverse waves be produced in air ?

Why we cannot hear an echo in a small room ?

Give scientific reasons Why cannot we hear the echo produced in a classroom?

By blowing air into a funnel through the narrow end, the filter paper inside the funnel cannot be removed. Why?

Sound wave in air cannot be polarised because

Sound wave in air cannot be polarised because