Question

Take a metal or glass tumbler. Make sure that it is dry. Place a cell phone in it. Ask your friend to give a
ring on this cell phone from another cell phone. Listen to the ring carefully.
Now, surround the rim of the tumbler with your hands (Fig.). 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.
Does the sound become fainter as you suck air?
Remove the tumbler from your mouth. Does the sound become loud again?What do you infer from the
activity?

Answer 1

Explanation:

The sound becomes fainter when you suck the air thus implying that sound needs a medium to travel. When air is sucked out the particles cannot vibrate and transmit the sound, thus making the sound fainter.

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