An oil drop falls through air with a terminal velocity of `(5xx10^(-4))/(sec)` viscosity of air is `1.8xx10^(-5)(N-s)/(m^(2))` and density of oil is 900 kg `m^(3)` neglect density of air as compared to that of oil.

Options

A. radius of the drop is `6.20xx10^(-2) m`
B. radius of the drop is `2.14xx10^(-6) m`
C. terminal velocity of the drop at half of this radius is `1.25xx10^(-4) m//s`
D. terminal velocity of the drop at half of this radius is `2.5xx10^(-4) m//s`

Answer

B, C