Which one of the following statement is correct? (a) Surface energy is potential energy per unit length (b) Surface tension is work done per unit area (c) Surface tension is work done per unit length (d) Surface energy is work done per unit force

Answer: (b). Work done to increase the surface area: W = T Δ A, so T = (W)/(Δ A). So surface tension equals work done per unit area (also equal to force per unit length). So the answer is (b).

Which one of the following statement is correct? | MHT CET 2019 (2 May, Shift 2)

Q15MHT CET 2019 · 2 MAY · SHIFT 2Easy

Molecular Theory & Factors

Which one of the following statement is correct?

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Answer: (b)

Work done to increase the surface area: $W = T\,\Delta A$ , so $T = \dfrac{W}{\Delta A}$ .
So surface tension equals work done per unit area (also equal to force per unit length).
So the answer is (b).

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