Explain with the help of an activity sound need any medium to travel.Class 8
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Answers
Answer:
Sound needs a material medium for their propagation like solid, liquid or gas to travel because the molecules of solid, liquid and gases carry sound waves from one point to another. Sound cannot progress through the vacuum because the vacuum has no molecules which can vibrate and carry the sound waves.
Answer:
Procedure: place a bell jar on a table and suspend an electric bell in it. Take out the electric wires through an airtight cork fitted on the mouth of the bell jar. Connect them to a battery with the switch. Connect a vacuum pump to the bell.
Observation: when you press the switch, the hammer of the electric bell strikes the gong and you can hear the sound.
Conclusion: this is because the jar containing air and sound travel through this air.
Procedure: now start the vacuum pump and remove the air slowly from the bell jar. Pressure switch
Observation: you will find that the sound of the electric bell becomes fainter and fainter and ultimately becomes inaudible. However, the hammer and still be seen striking the gong.
Conclusion: the activity shows that the sound cannot travel in vacuum. It can travel only through a medium.
Sound needs a material medium for their propagation like solid, liquid or gas to travel because the molecules of solid, liquid and gases carry sound waves from one point to another. Sound cannot progress through the vacuum because the vacuum has no molecules which can vibrate and carry the sound waves
Explanation:
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