Two rain drops falling through air have radii in the ratio 1:2, They will have terminal velocity in the ratio:

Options

A. `4:1`
B. `1:4`
C. `2:1`
D. `1:2`

Answer

B

Explanation

Terminal velocity,
`v=(2r^(2)(rho-sigma)g)/(9eta)`
i.e., `vpropr^(2)`
`therefore" "(v_1)/(v_2)=(r_(1)^(2))/(r_(2)^(2))=((1)/(2))^(2)=(1)/(4)`