A hollow pipe of length \( 0.8 \mathrm{~m} \) is closed at one end....

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A hollow pipe of length \( 0.8 \mathrm{~m} \) is closed at one end. At its open end a \( 0.5 \mathrm{~m} \) long uniform string is vibrating in its second harmonic and it resonates with the fundamental
\( \mathrm{P} \) frequency of the pipe. If the tension in the wire is \( 50 \mathrm{~N} \) and

W the speed of sound is \( 320 \mathrm{~ms}^{-1} \), the mass of the string is
[IIT-JEE 2010]
(a) 5 grams
(b) 10 grams
(c) 20 grams
(d) 40 grams
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