Question

Explain the experiment with neat diagram to prove sound need material medium for propagation​

Answer 1

Answer:

Bell jar experiment can prove that sound needs material medium for its propagation. Initially, the vacuum pump is 'OFF' so that air is present inside the jar. ... If the pump is used for a sufficiently long period, then the quantity of air inside the jar will be so low that the ringing sound outside it will not be audible

Answer 2

Answer:

1. Take a metal or glass tumbler. Make sure that it is dry. Place a cell phone in it .
2. Ask your friend to give a ring on this cell phone from another cell phone.
3. Now,surrounded the rim of the tumbler with your hand . Put your mouth on the opening between your hands. Indicate to your friend to give a ring again. Listen to the ring while sucking air from the tumbler.
4. Remove the tumbler from your mouth . Does the sound become loud again ?