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A string 25 cm long fixed at both ends a...

A string `25 cm` long fixed at both ends and having a mass of `2.5 g` is under tension. A pipe closed from one end is `40 cm` long. When the string is set vibrating in its first overtone and the air in the pipe in its fundamental frequency, `8` beats per second are heard. If is observed that decreasing the tension in the string decreases the beat frequency. If the speed of sound in air is `320 m//s`. Find tension in the string.

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