Write your answers to the following questions:
A teacher entered a dark classroom and allowed a narrow beam of sunlight to pass through a small hole in the window. The beam became visible as it passed through the smoky air. The teacher explained that the air contained suspended particles that scattered the light.
1. Why could the path of the sunlight be seen in the classroom?
2. Which condition is essential for observing the Tyndall effect in this situation?
3. What does this observation demonstrate about the particles suspended in air?