You hear sound thanks to a tiny tiny sheet inside your ear, that goes back and forth when sound from the outside hits it.
This sheet is called the ear drum, since it looks a little like the top of a drum (the part you’re hitting with the drum stick).
A high note (right side of piano) will make the ear drum go back and forth really fast, maybe a thousand times every second. We call this a sound with high frequency.
A low note (left side of piano) will make the ear drum go back and forth really slow, maybe just some tens of times every second. We call this a sound with low frequency.
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