MHT CET 2022 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 pipe. If the tension in the string is 50 N and speed of sound in air is 320 m/s, the mass of the string is
Answer: (A)
Solution
Fundamental frequency of a pipe closed at one end: Hz. A string of length m vibrating in its second harmonic has . Resonance gives
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