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A string vibrating with a fundamental fr...

A string vibrating with a fundamental frequency of 8 Hz has tension `T_(1)`. This string vibrates with a fundamental frequency of 15 Hz when the tension is `T_(2)` .
Find the fundamental frequency of the string when its tension is `T_(1) + T_(2)` .

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(i) Relation between frequency and tension of a stretched string .
(ii) `n prop sqrtT`
(iii) 17 Hz
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