![]() when the air is removed from the jar you cannot hear the sound because sound needs something to travel through.when the jar is placed over the bell it is quieter because the jar muffles some of the sound.You will notice that you start to hear the bell again. You can still see the bell hammer hitting the gong, so you know the bell is ringing, but the sound is not reaching you. You will notice that as air is removed, the ringing sound gets quieter and quieter, until you cannot hear it at all. Listen carefully as the vacuum pump removes the air from inside the jar. Make sure the safety screen remains between you and the bell jar. Keep the bell ringing and turn on the vacuum pump. You should notice that it is not as loud, but you are still able to hear it. Stand behind a safety screen.Ĭlose the switch again and listen to the ring. Make sure it is tightly sealed at the bottom and connect to a vacuum pump. Now place the bell inside a glass jar, called a bell jar, as shown above. These signals travel to the brain along the auditory nerve.Įlectrical signals travel from the cochlea to the brain along the auditory nerve. The snail-shaped cochlea changes the vibrations from the middle ear into nerve signals. ![]() The stirrup is the smallest bone in the body. The eardrum is attached to the hammer which is attached to the anvil which is attached to the stirrup. Three small bones which pass on vibrations from the eardrum to the cochlea. The pathway for the sound wave to the ear drum and the middle ear.Ī thin, cone shaped piece of tissue stretched tight across the end of the ear canal. They are quite good for hanging spectacles and sunglasses on too. Its main job is to gather sound waves and funnel them towards the ear canal. This is the outer flap of the ear – the part you see on the side of your head.
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