Question

Which of the following will scatter light?
A.Blood
B.Starch
C.Soup Solution
D.All of these

Answer 1

Hint:The scattering of light by the particles in a colloid or the particles in a fine suspension is known as the Tyndall Effect. Colloids are a mixture of macroparticles in a solvent.

Complete step by step answer:
The Tyndall effect is also known as the Tyndall Scattering and in this effect, the intensity of the scattered light is inversely proportional to the fourth power of wavelength and hence the blue light is scattered much more than the red light. The Tyndall effect can be seen when the particles are having diameter in the range of 40 and 900 nm which is somehow below or near the wavelength of the visible light (400-750 nm).
Blood is a colloid, starch is also colloidal, and the soap solutions also have large enough particles that can show Tyndall effect. Hence all the above solutions can show Tyndall Effect.

Hence, the correct answer is option D, all of these.

Note:
The Tyndall effect was discovered by Physicist John Tyndall in the 19th century.
A flour solution appears blue to the eyes; this is due to the fact that the blue light is scattered by the flour solution and hence it reaches the eyes of the viewers.
The sky appearing blue and the sunset appearing red are all caused due to the Tyndall Effect. The air molecules in the atmosphere scatter the blue light mostly. Hence the sky appears to be blue.