Question

Which of the following equation expresses the velocity of settling particles as described by Stokes law ?

• A. $v = 2g r^2 (D_p - D_l) / 9\eta$
• B. $v = 2g r (D_p - D_l) / 9\eta$
• C. $v = 2g r^2 (D_l - D_p) / 9\eta$
• D. $v = g r (D_l - D_p) / 4.5\eta$

Hint:

Always remember that settling velocity is proportional to the square of the radius ($r^2$), and depends on the density difference $(D_p - D_l)$. This helps you eliminate incorrect options.

Answer 1

The Correct Option is A