Tyndall effect is observed when:
Show Hint
- The diameter of dispersed particles is similar to the wavelenght of light used.
- The diameter of dispersed particles is much smaller than the wavelength of light used.
- The diameter of dispersed particles is much larger than the wavelength of light used.
- The refractive index of dispersed phase is greater than that of the dispersion medium.
The Correct Option is A
Solution and Explanation
Condition 1: the diameter of the dispersed particles must be of the same order as the wavelength of visible light (colloidal range, roughly 1-1000 nm).
Condition 2: the refractive indices of the dispersed phase and the dispersion medium must differ appreciably; a larger value for the dispersed phase alone is not the criterion.
If particles are much smaller (true solution) there is negligible scattering; if much larger (suspension) the system is turbid and light is mostly reflected.
Hence option (1) is the correct statement.
Answer: (1) The diameter of dispersed particles is similar to the wavelenght of light used.
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