Question

Two identical rain drops are falling through air each with a terminal velocity \(V\). If the two drops coalesce to form one single big drop, then the terminal velocity of the big drop is

• A. \(\dfrac{V}{2^{2/3}}\)
• B. \(2^{2/3}V\)
• C. \(2^{1/3}V\)
• D. \(\dfrac{V}{2^{1/3}}\)

Hint:

Under Stokes' law, \[ \boxed{ V_t\propto r^2 } \] and when \(n\) identical drops coalesce, \[ \boxed{ R=n^{1/3}r. } \]

Answer 1

The Correct Option is B