Longitudinal waves are produced in four identical rods in different situations. Their mode of vibration are fixed points (with bold point) are shown in the column-2 , their frequencies are given in the column -1 and their wavelength in column-3 . Each of the rod has length 1 m young's modulus of elasticity `2xx10^12 N//m^2` and density `5xx10^(3) kg//m^3`

Pick the correct combination for the fundamental mode.

Options

A. (l)(ii)(Q)
B. (III)(ii)(P)
C. (I)(ii)(P)
D. (IV)(ii)(R)