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A string of length 1m and mass 4×10−5kg  is under tension T. When the string vibrates, two successive harmonics are found to occur at frequencies 750 Hz and 1000 Hz. The value of tension T is ____________ Newton.

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answer is 10.

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A string of length 1m and mass 4×10−5kg  is under tension T. When the string vibrates, two successive harmonics are found to occur at frequencies 750 Hz and 1000 Hz. The value of tension T is ____________ Newton.