Correct option (c) T∝ 1/√A
Explanation:
Let I be the length of block immersed in liquid as shown in the figure. When the block rs floating,
If the block is given vertical displacement y then the effective restoring force is
Restoring force =-[Alρg]y.As this F is directed towards its equilibrium position of block, so if the block is left free, it will execute simple harmonic motion-