Sound waves are mechanical waves, that is
oscillations of pressure transmitted through a
solid, liquid, or gas; sound waves are created
by a vibration of an object, which causes
vibrations in the air. The vibrating air causes
your eardrums to vibrate and you hear a sound.
An accordion causes vibrations by pushing air
through a valve and over a reed. Pressing a key
selects and opens a valve and pumping the
accordion blows air over the reed, causing it to
The size and mass of the reed and the size of
the resonant cavity surrounding the reed control
the frequency of the waves. Difference
frequencies are different pitches or notes. By
pressing a key on the accordion, one can play a
note or a chord. The accordion range is from
F3 (with frequency = 174.614 Hz) to
A7 (with frequency = 3520.00 Hz).
The speed of pumping controls the amplitude of
the wave. The higher the amplitude, the louder
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