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. Neglecting frictional force of water and given that the density of the bob is (4/3) × 1000kg/m3 . What relationship between t and t0 is true?
(a) t = t0
(b) t = t0/2
(c) t = 2t0
(d) t = 4t0.
