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Law of Density #8211; If l, T and D are constants, then frequency of vibration of stretched string (f) is inversely proportional to the square root of the density of ware. [∵ f = n/2l√T/μ = n/2l√TIA/MA = n/2l√4T/ρ D<sup>2</sup> π ] i.e. f ∝ 1/√ρ
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