1,000 identical drops of oil of density 500kgm^-3 have a total mass of 5 x 10^-4kg. One of the drops forms a thin film of area 0.5m² on water. The thickness of the film is

2 x 10^-8m

2 x 10^-9m

2 x 10^-7m

3 x 10^-9m

2.8 x 10^-8m

Correct answer is B

Mass of one oil = $\frac{5 \times 10^{-4}}{1000}$

= 5 x 10^-4kg

Density = $\frac{\text {mass}}{\text{area x thickness}}$

500 = $\frac{5 \times 10^{-7}}{\text{0.5 x thickness}}$

thickness = 2 x 10^-9m

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