question_answer

A tuning fork of frequency 330 Hz resonates with an air column of length 120 cm in a cylindrical tube, in the fundamental mode. When water is slowly poured in it, the minimum height of water required for observing resonance once again is (Velocity of sound\[330\text{ }m{{s}^{-1}}\])

A)  75 cm                  

B)         60 cm                  

C)  50 cm                  

D)         30 cm

E)  45 cm