A tuning fork having frequency of `340Hz` is vibrated just above a cylindrical tube. The height of the tube Is `120`cm.Water is slowly poured in it. What is the minimum height of water require for resonance? Velocity of sound in air is 340 m/s. ?
`1) 40 cm`
`2) 50 cm`
`3) 45 cm`
`4) 55 cm`