5 beats/ second are heard when a turning fork is sounded with a sonometer wire under tension, when the length of the sonometer wire is either 0.95 m or 1 m . The frequency of the fork will be:

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Probable frequencies of tuning fork be n ± 5 Frequency of sonometer wire, n ∝ l 1 ​ ​ ∴ n − 5 n + 5 ​ = 95 100 ​ ⇒ 95 ( n + 5 ) = 100 ( n − 5 ) or, 95 n + 475 = 100 n − 500 or, 5 n = 975 or, n = 5 975 ​ = 195 Hz ​

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