Cite an experiment to show that sound needs a material medium for its propagation.

Asked by Vishal kumar | 1 year ago |  140

1 Answer

Solution :-

Take an electric bell and hang it inside an empty bell-jar which is fitted with a vacuum pump (as shown in the figure below).

Initially, one can hear the sound of the ringing bell. Now, pump out some air from the bell-jar using the vacuum pump. You will realize that the sound of the ringing bell decreases. If you keep on pumping the air out of the bell-jar, then glass-jar will be devoid of any air after some time. Now try to ring the bell. No sound is heard but you can see bell prong is still vibrating. When there is no air present in the bell jar, a vacuum is produced. Sound cannot travel through vacuum. Therefore, this experiment shows that sound needs a material medium for its propagation.

Answered by Vishal kumar | 1 year ago

Related Questions

Explain how defects in a metal block can be detected using ultrasound.

Class 9 Science Sound View Answer

A sonar device on a submarine sends out a signal and receives an echo 5 s later. Calculate the speed of sound in water if the distance of the object from the submarine is 3625 m.

Class 9 Science Sound View Answer

Explain the working and application of a sonar.

Class 9 Science Sound View Answer