Question

prove that sound reflects after striking a hard surface?

Answer 1

sound reflects hard surface but polished surface because it doesn't get any conserving object it reflect sound.... which is also called echo effect...

Answer 2

Sound is a form of energy which is produced by vibration of objects. Vibrations are rapid to and fro motion of an object.

When a body vibrates, a disturbance is created in the medium by the particles.

This disturbance travels in the form of waves. This produces sound.

Experiment to prove:–


By the following experiment it shows sound cannot travel through vacuum. It needs a medium to propagate.

Apparatus: - Electric bell, Airtight glass bell jar, Switch, vacuum pump.

Procedure: -

Take an electric bell and an airtight glass bell jar. The electric bell is suspended inside the airtight bell jar.If we press the switch ’ON’ we will be able to hear the bell.Now when we connect the bell to the vacuum pump. All the air from the jar is pumped out gradually; the sound becomes fainter, although the same current is passing through the bell.After some time when more air is pumped out from the jar, we will hear a very feeble sound.And finally the sound will not be heard when all the air is completely removed from the jar.This happens as almost all air has been pumped out.

This proves sound needs a material medium to propagate, it can’t propagate through vacuum.

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