Question

When 8 droplets of water of radius 0.5 mm combine to form a single droplet. The radius of it is ………

(a) 4 mm 

(b) 2 mm 

(c) 1 mm 

(d) 8 mm

Answer 1

(c) 1 mm

Volume of 8 droplets of water = 8 ×  \(\frac{4}{3}\)π(0.5)³ When each droplet combine to form one volume remains conserved

R³ = 8 × (0.5) 

R³ = (8 × (0.5) ) 

R³ = 2 × 0.5 = 1 mm