Fill water in a beaker or a glass up to the brim. Gently touch the water surface with one of the prongs of the vibrating tuning fork.

Next dip the prongs of the vibrating tuning fork in water.

Observe what happens in both the cases.

Discuss with your friends why this happens.

Arrange them on a table near a wall.

Keep a clock near the open end of one of the pipes and try to hear the sound of the clock through the other pipe.

Adjust the position of the pipes, so that you can best hear the sound of the clock.

Now, measure the angles of incidence and reflection and see the relationship between the angles.