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Melde's experiment is useful to demonstrate the
formation of transverse stationary waves and to determine the unknown
frequency of a tuning fork.
The frequency of the tuning fork is determined by the formula
mass per unit length of the given light string
Tension applied = mg
where m: mass of the weights attached
number of loops formed in the vibrating length 'l' of the
or Longitudinal Position: In this position, the vibrations of the
tuning fork are parallel to the length of the string.
Melde's Experiment (Parallel
The string is attached to the prong of the tuning fork whose
frequency is to be determined while the other end of the string passing
over a pulley has a light pan attached at its free end. Tension is
applied to the string by adding weights to the pan.
Fork in rest position, string is straight.
Fork vibrates ® prongs bend
outwards ® string sags down
Prongs bend inwards ® string straightens.
Prongs again bend outwards ® string slacks upwards.
\ N = 2n.
= frequency of the vibrating string.
\ N = p/l
N = n =
where n =
= frequency of
the vibrating string.