Question

Question #c451f

Answer 1

As explained in above figure that in the resonance air column experiment with one end closed tube we get first resonance air column at the length `lambda/4` , where `lambda` is the wave length of sound wave produced by the tuning fork in use. Here the length of 1st resonant air column is `l_1=15cm`.

Hence `lamda/4=15cm`

The second resonant air column will be obtained at the length
`l_2=(3lambda)/4=3xx15=45cm->"option(c)"`