JEE Advanced 2010 Physics question
A hollow pipe of length 0.8 m is closed at one end. At its open end a 0.5 m long uniform string is vibrating in its second harmonic and it resonates with the fundamental frequency of the pipe. If the tension in the wire is 50 N and the speed of sound is 320 , the mass of the string is
Answer: (B)
Solution
Fundamental frequency of a pipe closed at one end: Hz. For a string fixed at both ends, the second harmonic is . Resonance: $ = 100
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