In the column-I, a system is described in each option and corresponding time period is given in the column-II. Suitably match them.

	Column-I		Column-II
P	A simple pendulum of length '$\mathcal{l}$' oscillating with small amplitude in a lift moving down with retardation $g\text{/}2.$	1	$T=2\pi \sqrt{\frac{2\mathcal{l}}{3g}}$
Q	A block attached to an end of a vertical spring, whose other end is fixed to the ceiling of a stationary lift, stretches the spring by length '$\mathcal{l}$' in equilibrium. It's time period when lift moves up with an acceleration $g\text{/}2$ is	2	$T=2\pi \sqrt{\frac{\mathcal{l}}{g}}$
R	The time period of small oscillation of a uniform rod of length '$\mathcal{l}$' smoothly hinged at one end. The rod oscillates in vertical plane.	3	$T=2\pi \sqrt{\frac{2\mathcal{l}}{g}}$
S	A cubical block of edge ' $\mathcal{l}$ ' and specific gravity $1\text{/}2$ is in equilibrium with some volume inside water filled in a large fixed container. Neglect viscous forces and surface tension. The time period of small oscillations of the block in vertical direction is	4	$T=2\pi \sqrt{\frac{\mathcal{l}}{2g}}$