"Helmholtz, writing about the sympathetic vibrations and speaking of placing a wooden chip on C string of a piano, writes: the motion of the chip is greatest when one of the undertones of C is struck such as C F C A? F D C.

This suggests sounding an undertone with the fundamental frequency will resonate a body physiologically more than an overtone or a partial will." [source unknown]

See Also

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Fibonacci Series
Figure 9.10 - Phases of a Wave as series of Expansions and Contractions
Figure 9.5 - Phases of a Wave as series of Expansions and Contractions
Harmonic Series
Helmholtz Resonator
Hermann Helmholtz
minor
minor chord
minor key
minor scale
minor system
Overtone series
series
subharmonic
superharmonic
sympathetic oscillation
sympathetic vibration
undertone
9.8 - Spontaneous Creation of Harmonic Series