In a long cylindrical tube , the water level is adjusted and the air column above it is made to vibrate in unison with a vibrating tuning fork kept at the open end . Maximum sound is heard when the air column lengths are equal to

Options

A. `(lambda)/(4),(lambda)/(2),(3lambda)/(4)`
B. `(lambda)/(2), lambda, (3lambda)/(2)`
C. `(lambda)/(2),(3lambda)/(2),(5lambda)/(2)`
D. `(lambda)/(4),(3lambda)/(4),(5lambda)/(4)`

Answer

D

Explanation

odd number of half loop `("length "(lambda)/(4))` are required for unison.