The surface energy of an interface depends on:
AOne material
BNeither side
CThe gas only
DBoth materials
Answer & Solution
Correct answer: D. Both materials
1. An interface separates two materials, not one.
2. Attraction across it lowers the energy, repulsion raises it.
3. So the surface energy depends on both materials.
_Source: NCERT Class 11 Physics Part II, Chapter 10, Mechanical Properties of Fluids._
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