The bob of a simple pendulum executes simple harmonic motion in water with a period t, while the period of oscillation of the bob is t₀ in air. Neglect frictional force of water and consider it is given that the density of the bob is $\left(\frac{4}{3}\right)\times 1000\mathrm{kg}/{\mathrm{m}}^3$. The correct relationship between t and t₀ is