Question

the testement of a walker summary​

Answer 1

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Answer 2

Answer:

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.