The fundamental frequency of a sonometer wire is 50 Hz for some length and tension. If the length is increased by 25% by keeping tension same, then frequency change of second harmonic is

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(D) ∴ ∴ ​ n 2 ​ ℓ 2 ​ = n 1 ​ ℓ 1 ​ n 2 ​ = ℓ 2 ​ ℓ 1 ​ ​ ⋅ n 1 ​ = 1.25 R 1 ​ ℓ 1 ​ ​ n 1 ​ = 0.8 n 1 ​ n 1 ​ − n 2 ​ = n 1 ​ ( 1 − 08 ) = 0.2 n 1 ​ n 1 ​ n 1 ​ − n 2 ​ ​ = 0.2 ​

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