Explaining an Experiment

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Explaining an Experiment

• Question - What I want to know?

This is an experiment to find out how the ear
detects sound.
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Explaining an Experiment

• Background Material Facts I already know.

Sound enters the outer ear and then travels
through the ear canal to the middle ear. Then the
sound causes the ear drum to vibrate. These
vibrations move through three tiny bones in the
inner ear before turning into signals that are
sent to the brain. These signals are then decoded
by the brain and we recognize the sound.
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Explaining an Experiment

• Hypothesis What I think will happen.

I believe that in this experiment the plastic
wrap on the top of the bowl will act like the
eardrum and the rice will move when the pan is
struck.
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Explaining an Experiment

• Materials What do I need to do this experiment?
  

For this experiment you will need an empty bowl,
a sheet of plastic wrap, a metal spoon, a
tablespoon of uncooked rice, and a metal pan.
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Explaining an Experiment

• Procedures What do I do?

First, stretch the plastic wrap across the top of
the bowl. Second, place some grains of rice on
top of the wrap. Then take the metal pan and
place it over the bowl. Make sure the pan does
not touch the bowl. Finally, strike the pan with
the spoon.
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Explaining an Experiment

• Observations/ Results What happened?

Guess what happened? The rice moved as the pan
was struck by the spoon. The noise was like
someone banging on a steel drum.
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Explaining an Experiment

• Conclusions What I learned.

By banging on the pan the sound waves traveled to
the bowl.The rice moved because the sound waves
made the plastic wrap vibrate. I learned that the
vibration moved the uncooked rice like an eardrum
vibrates in the ear.
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This is an experiment to find out how the ear
detects sound. Sound enters the outer ear and
then travels through the ear canal to the middle
ear. Then the sound causes the ear drum to
vibrate. These vibrations move through three tiny
bones in the inner ear before turning into
signals that are sent to the brain. These signals
are then decoded by the brain and we recognize
the sound.
9

I believe that in this experiment the plastic
wrap on the top of the bowl will act like the
eardrum and the rice will move when the pan is
struck. For this experiment you will need an
empty bowl, a sheet of plastic wrap, a metal
spoon, a tablespoon of uncooked rice, and a metal
pan. First, stretch the
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plastic wrap across the top of the bowl. Second,
place some grains of rice on top of the wrap.
Then take the metal pan and place it over the
bowl. Make sure the pan does not touch the bowl.
Finally, strike the pan with the spoon.
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• Guess what happened? The rice moved as the pan
  was struck by the spoon. The noise was like
  someone banging on a steel drum. By banging on
  the pan the sound waves traveled to the bowl.The
  rice moved because the sound waves made the
  plastic wrap vibrate. I learned that the
  vibration moved the uncooked rice like an eardrum
  vibrates in the ear.

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