Question

if the air column in a tube ,open at both ends ,is set in vibration .what harmonics are possible​

Answer 1

Answer:

Vibrations of Air Column in a Pipe Open at Both Ends:

Consider a tube open at both ends. A vibrating tuning fork held near anyone end produces longitudinal waves in the air column. They are reflected from the other end. The incident and reflected waves interface with each other and stationary waves are formed.

Explanation:

1 - what harmonics are possible?

Ans - For example, if the fundamental frequency is 50 Hz, a common AC power supply frequency, the frequencies of the first three higher harmonics are 100 Hz (2nd harmonic), 150 Hz (3rd harmonic), 200 Hz (4th harmonic) and any addition of waves with these frequencies is periodic at 50 Hz.