Cite an experiment to show that sound needs a material medium for its propagation.
Take an electric bell and an air tight glass bell jar connected to a vacuum
pump. Suspend the bell inside the jar, and press the switch of the bell. You
will be able to hear the bell ring. Now pump out the air from the glass jar. The
sound of the bell will become fainter and after some time, the sound will not be
heard. This is so because almost all air has been pumped out.This shows that
sound needs a material medium to travel.
