A 25 cm long string is fixed at both ends. It has a mass of 2.5 g and vibrates in its first overtone under tension. Also given is a closed pipe which is 30 cm long which vibrates in its fundamental frequency. When both of these are sounded simultaneously, 8 beats per second are heard. It is also observed that decreasing the tension in the string also decreases the beat frequency. What is the tension (in N) in the string? [Given, speed of sound in air is 360 ms -1 ]
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(59.29)
overtone,
Pipe in fundamental frequency, 
By decreasing the tension, beat frequency is decreased.
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