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 o...

Assessment: JAMB UTME - Physics - 1983 Subject: Physics

Question 1 Report

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

Answer Details

Mass of one oil =

\frac{5 \times 10^{- 4}}{1000}

= 5 x 10-4kg

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

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

thickness = 2 x 10-9m

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