A string 25 cm long and having a mass of 2.5 g is under tension. A pipe closed at 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/s are heard. It 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 the tension in the string.
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Answer:
Explanation:
The fundamental frequency of the closed pipe is The frequency of the vibrating string is 208 Hz so that with decrease in tension of the string the frequency of the string decreases and the beat frequency also decreases. The first overtone of the string is
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