Cite an experiment to show that sound needs a. material medium for its propagation?
Answers
Explanation:
Compression and rarefaction are produced because of the disturbance in medium caused by sound wave. ... Question 3: Cite an experiment to show that sound needs a material medium for its propagation. Answer: Activity: Take a glass bell jar, connect it with vacuum pump and suspend an electric bell in it.
Take an electric bell and hang it inside an empty bell-jar which is fitted with a vacuum pump (as shown in the figure above).
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.
