Sonometer consists of a hollow rectangular wooden box of more than one meter length, with a hook at one end and a pulley at the other end. One end of a string is fixed at the hook and the other end passes over the pulley. A weight hanger is attached to the free end of the string. Two adjustable wooden bridges are put over the board, so that the length of string can be adjusted.
If a string which is stretched between two fixed points is plucked at its center, vibrations produced and it move out in opposite directions along the string. Because of this, a transverse wave travels along the string.
If a string of length l having mass per unit length m is stretched with a tension T, the fundamental frequency of vibration f is given by;
From the law of length, f ×l = constant
A graph between f and 1/l will be a straight line.
From the equation for frequency, √T / l = constant
A graph between T and l2 will be a straight line.
Cite in Scientific Research:
Nedungadi P., Raman R. & McGregor M. (2013, October). Enhanced STEM learning with Online Labs: Empirical study comparing physical labs, tablets and desktops. In Frontiers in Education Conference, 2013 IEEE (pp. 1585-1590). IEEE.
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