Concepts Of Physics MCQ Edition [Volume 1]
- Exam
- Concepts Of Physics MCQ Edition [Volume 1]
- Subject
- Physics
- Chapter
- Some Mechanical Properties of Matter
Concepts Of Physics MCQ Edition [Volume 1] · Physics · Some Mechanical Properties of Matter
The properties of a surface differ from those of the bulk liquid...
The properties of a surface differ from those of the bulk liquid because the surface molecules
Options
- Aexperience a net force in one direction
- Bacquire charge due to collisions with air molecules
- Care smaller than the other molecules
- Dencounter different types of molecules within their range of influence
Correct answer
D. encounter different types of molecules within their range of influence
Step-by-step solution
Molecules deep inside a liquid are surrounded by similar molecules on all sides, making the net intermolecular force on them zero.
Molecules at the surface are not completely surrounded by liquid molecules. They have liquid molecules below them and molecules of a different medium (like air or vapor) above them. Thus, they encounter different types of molecules within their range of influence.
Due to the difference in the number and type of molecules above and below, the cohesive downward force from the liquid is greater than the adhesive upward force from the medium above. As a result, surface molecules experience a net inward force (in one direction) towards the bulk of the liquid.
Therefore, surface molecules experience a net force in one direction and encounter different types of molecules within their range of influence.
Molecules at the surface are not completely surrounded by liquid molecules. They have liquid molecules below them and molecules of a different medium (like air or vapor) above them. Thus, they encounter different types of molecules within their range of influence.
Due to the difference in the number and type of molecules above and below, the cohesive downward force from the liquid is greater than the adhesive upward force from the medium above. As a result, surface molecules experience a net inward force (in one direction) towards the bulk of the liquid.
Therefore, surface molecules experience a net force in one direction and encounter different types of molecules within their range of influence.