Vibration of which among the following produces only odd harmonics?

Options

A. An air column in a closed organ pipe
B. A vibrating string fixed at two ends
C. An air column in an open organ pipe
D. A vibrating rod fixed at two ends

Answer

A

Explanation

In the first mode of vibration of the air column, there is one node and one antinode. In the second mode of vibration of the air column, two nodes and two antinodes are formed. ... This shows that only odd harmonics are present in the modes of vibrations of the air column closed at one e nd.