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JEE Main202117 Mar 2021Evening ShiftPhysicsMechanical Properties of FluidsActual

Suppose you have taken a dilute solution of oleic acid in such a way that its concentration becomes 0 . 01 cm 3 of oleic acid per cm 3 of the solution. Then you make a thin film of this solution (monomolecular thickness) of area 4 cm 2 by considering 100 spherical drops of radius 3 40 π 1 3 × 10 - 3 cm . Then the thickness of oleic acid layer will be x × 10 - 14 m . Where x is ________ .

Correct answer

0

Step-by-step solution

4 t T = 100 × 4 3 π r 3 = 100 × 4 π 3 × 3 40 π × 10 - 9 = 10 - 8   cm 3 t T = 25 × 10 - 10   cm = 25 × 10 - 12   m t 0 = 0 . 01 t T = 25 × 10 - 14   m ⇒ x = 25 .

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