How we can prove that sound cannot travel through vacuum?

Answer 1

throgh bell jar expiriment. glass jar is made to be vacuum . electric bell is placed in it , along with a sound detector(made with sound diode)without physical contact. the sound detector doesnt detect it.hence proved...

Answer 2

Theoretically you can prove that sound can't travel through a vaccuum, because sound needs a medium to travel through. In a vaccuum there is nothing to vibrate, so the wave won't move.

Practically, you could build a sealed vessel from which you were capable of extracting all the air. Suspend a radio or something inside it, and record that no sound comes out. Be carefull though, whatever you use to suspend the radio will transmit the sound, so you'll have to construct it from a material that doesn't conduct sound very well, I'd use some type of heavy polymer. If you want to get really technical, you could rig up a system where you suspend the radio in a magnetic field, of course then you couldn't actually use a radio as that would screw up the signal.

EDIT: what the other people said about using a bell - that's a better idea than a radio, use a bell.

Answer 3

I have a bell that I can put into a jar and apply a vacuum. You no longer can hear the bell. By definition, sound is the physical vibration of a medium that is in the hearing range. Vacuum is not a medium.

Answer 4

just have a elec bell in a glass box evacuated . you cannot hear the bell ring after being evacuated

Answer 5

by mesuring sound waves