The diagram given illustrates the waveform of a note produced by vibrations in an air column of length L. If the speed of sound in air is V, derive an expression for the frequency of the notes

• A.\(\frac{V}{L}\)
• B.\(\frac{5VL}{2}\)
• C.\(\frac{5L}{4V}\)
• D.\(\frac{5V}{4L}\)