alleryCompared with molecules inside, those at the interface have energy:
AExtra
BEqual
CLower
DZero
Answer & Solution
Correct answer: A. Extra
1. A molecule inside is pulled equally from all sides.
2. One at the interface is not, so it is less tightly bound.
3. It therefore carries extra energy.
_Source: syllabus Physics Part II, Chapter 10, Mechanical Properties of Fluids._
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