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Incorrect statement for Tyndall effect is

Options

  1. AThe refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude.
  2. BThe diameter of the dispersed particles is much smaller than the wavelength of the light used.
  3. CIt is used to distinguish a true solution from a colloidal solution.
  4. DDuring projection of movies in the cinemas hall, Tyndall effect is noticed.

Correct answer

B. The diameter of the dispersed particles is much smaller than the wavelength of the light used.

Step-by-step solution

Tyndall effect is observed only when the following two conditions are satisfied. (i) The diameter of the dispersed particles is not much smaller than the wavelength of the light used; and (ii) The refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude. This is a characteristic property of the colloid solutions.

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