Answer: comparable to the wavelength of light.
- A much smaller than the wavelength of light
- B comparable to the wavelength of light
- C exactly zero
- D larger than one millimetre
Correct answer: B. comparable to the wavelength of light
Explanation: Effective scattering (Tyndall effect) occurs when particle size is comparable to the wavelength of the light used.
A typical adsorption isotherm: x/m (mass adsorbed per gram of adsorbent) rises steeply at low pressure, then flattens into a saturation plateau as the adsorbent surface fills up.
Concept context
Explore the chemistry that happens at interfaces, from catalysts that speed up industrial reactions to colloids like milk, smoke, and gels that surround us every day.