f = 1/2L * √(T/m) find dimension of m
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In thin string of length L, bound tightly at its two ends, transverse waves can be created. Let the tension in the string be T and mass per unit length be m.
frequency of oscillation (SHM) = f = 1/2L * √(T/m)
one can use the dimensional analysis:
f = [ T⁻¹ ]
L = [ L ]
T = force = [ M L T⁻² ]
m = [ M L⁻¹ ]
so RHS = [ T⁻¹ ] = LHS.
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