Correct option is B
Explanation:
When liquid soap is added to the center of a bowl of water with black pepper flakes floating, the pepper flakes quickly move to the edges of the bowl.
This happens due to:
Important Key Points:
Surface Tension Effect:
Water has surface tension that keeps the pepper flakes floating.
Soap reduces the surface tension where it's added (in the center).
Sudden Imbalance:
The reduction in surface tension at the center creates a tension difference between the center and the surrounding water.
Water molecules move from low surface tension (center) to high surface tension (edges), carrying the pepper flakes along.
Visual Result:
The flakes seem to "run away" from the soap, spreading quickly outward.
Simple Science Demonstration:
This is a classic experiment to demonstrate surface tension and its disturbance by soap.
Final Answer: (B) move away from the centre
