We have just learned that the pitch of sound depends on the
rapidity of the vibrations. This depends on the length of cords and
their tightness for the shorter and tighter a string is, the higher
is the note which its vibration produces. The vocal cords of women
are about one-third shorter than those of men, hence the higher
pitch of the notes they produce. In children the vocal cords are
shorter than in adults. The cords of tenor singers are also shorter
than those of basses and baritones. The muscles within the larynx,
of course, play a very important part in altering the tension of
the vocal cords.
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