Question

Manu went to watch movie with his parents. In the dark, he found a small beam of
light within which millions of tiny dust particles were dancing. He was surprised
that when there were lights, no such beam appears. What makes the tiny dust
particles visible? Name the phenomenon involved.

Answer 1

Answer:

i)light

ii)the phenomenon of brownian movement

Answer 2

Answer:

1. Generally small particles are present in the air but they don’t reflect light.

2. Consider when a beam of sunlight passes through these small particles, we can see these particles with our naked eye. This observation is called Tyndall effect.

3. Assume, if you are in cinema theatre, all the lights are switched off, when a beam of light from the projector room is passed to the screen the dust in the air is scattered, which is observed by normal naked eye. This is called Tyndall effect. If there no beam of light such effect is not observed by our eyes. This is because the contrast between light and the dark background."

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