pipe x of length 3m is open at both ends. it produces a note of frequency 28Hz when the air in the pipe vibrates in its fundamental (first harmonic)...

pipe x of length 3m is open at both ends. it produces a note of frequency 28Hz when the air in the pipe vibrates in its fundamental (first harmonic) mode. Pipe y is closed at one end and also produces a note of frequency 28Hz when the air in the pipe vibrates in its fundamental mode. The best estimate for the length of pipe y is