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A string with mass density of 4times10-3...

A string with mass density of 4times10-3kg/m is under tension of 360N and is fixed at both ends. One of its resonance frequencies is 375Hz.The next higher resonance frequency is 450Hz .The mass of the string is
(A) `2times10^(-3)kg`
(B) `3times10^(-3)kg`
(C) `4times10^(-3)kg`
(D) `8times10^(-3)kg`

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