A resonating column has resonant frequencies as 100 Hz, 300 Hz, 500 Hz. Then, it may be

A resonating column has resonant frequencies as 100 Hz, 300 Hz, 500 Hz. Then, it may be
  1. an open pipe
  2. a pipe closed at both ends
  3. pipe closed at one end
  4. Data insufficient

Solution

Here, $f_1 : f_2 : f_3 = 1 : 3 : 5$. Odd harmonics are obtained in case of a pipe closed at one end.

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