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A string 25 cm long and having a mass of...

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 per second are heard . It is observed that decreasing the tencion in the string decrease the beat frequency. If the speed of sound in air is `320 m//s`, find the tension in the string.

A

25.03 N

B

27.04 N

C

37.01 N

D

20.02 N

Text Solution

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The correct Answer is:
B
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