Answer:
(a) Milk is a colloid. If a
beam of light is put on a milk sample contained in a beaker the path of light
beam is illuminated and becomes visible when seen from the other side. This is
because the colloidal particles are big enough to scatter light falling on
them. This scattered light enters our eyes and we are able to see the path of
light beam.
The scattering of light by colloidal
particles is known as Tyndall effect.
(b) Salt solution is a true .solution. If
a beam of light is put on a salt solution kept in a beaker in a dark room, the
path of light beam is not visible inside the solution when seen from the other
side. This is because salt particles present in it are so small that they
cannot scatter light rays falling on them.
(c) Detergent solution, sulphur solution.
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