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EEJ MAIN Chemistry QUESTION #7167
Question 1
Under what specific conditions can the Tyndall effect be clearly observed?
  • Particle diameter is much smaller than the wavelength; refractive indices are similar
  • Particle diameter is not much smaller than the wavelength; refractive indices are similar
  • Particle diameter is much smaller than the wavelength; refractive indices differ significantly
  • Particle diameter is not much smaller than the wavelength; refractive indices differ significantly✔️
Correct Answer Explanation
The Tyndall effect is the scattering of light by colloidal particles. It is observed only when:
  • The diameter of the dispersed particles is not much smaller than the wavelength of light used.
  • The refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude.