Consider two solid spheres P and Q each of density 8gm cm-3 and diameters 1 cm and 0.5 cm, respectively. Sphere P is dropped into a liquid of density 0.8 gm cm-3 and viscosity η = 3 Poiseuilles. Sphere Q is dropped into a liquid of density 1.6 gm cm-3 and viscosity η = 2 Poiseuilles. The ratio of the terminal velocities of P and Q is:
(a) 3
(b) 4
(c) 5
(d) 6
