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3.Ans :- Tyndall effect, also called Tyndall phenomenon, scattering of a beam of light by a medium containing small suspended particles—e.g., smoke or dust in a room, which makes visible a light beam entering a window. ... The effect is named for the 19th-century British physicist John Tyndall, who first studied it extensively.
4.Ans :- A colloid is a mixture in which one substance of microscopically dispersed insoluble particles are suspended throughout another substance. ... The term colloidal suspension refers unambiguously to the overall mixture (although a narrower sense of the word suspension is distinguished from colloids by larger particle size).
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