Explanation
Observer receives sound waves (music) which are longitudinal progressive waves.
Because both tuning fork and string are in resonance condition.
All particles between one pair of consecutive nodal points are in phase which is opposite to that of the particles between the preceding or succeeding pair. Thus all alternate antinodes vibrate in phase.
Fundamental frequency of open pipe is double that of the closed pipe.
At the middle of the pipe node is formed.
In open organ pipe both even and odd harmonics are produced.
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