IPS/Butler University Laboratory School

Today we explored eardrums! We created artificial eardrums by rubber banding plastic wrap over red plastic cups. We talked about how the plastic wrap represented the thin membrane covering the ear drum. To observe vibration, we opened a packet of sugar onto the top of each plastic wrapped cup and shouted at various levels. The sugar danced! We then tried singing, whispering, and shouting at different intervals to see what the sugar would do. We discovered that the sugar moved as a result of vibration. We created sounds which traveled via sound wave to the ear drums. The ear drums then vibrated! In a real ear, we learned this is part of a chain reaction. The ear drum then activates the anvil, hammer, and stirrup bones in the middle ear which activate the cochlea. The cochlea then activates the nerve ending which sends a signal to the brain to tell it what it is hearing. WOW! Science rocks.

Tags: experiment, project

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