The -------particle can be seen moving in a beam of sunlight in a dark room.

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Solution

The Tyndall effect is the phenomenon in which the particles in a colloid scatter the beams of light that are directed at them.
The dust particle is very small in nature not visible by the naked eye and they are visible in beam of sunlight due to the Tyndall effect.
The Dust particle can be seen moving in a beam of sunlight in a dark room.

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