(a) Time period of simple pendulum in water (T) is given by T=2π√
l
geff
[geff = acceleration due to gravity in water] Effective value of acceleration due to gravity when bob is immersed in water, is given by As weknow, geff = g (
σ−ρ
σ
) [Here, σ = density of bob, ρ = density of water] =9.8(