Question: Without changing the light source’s power or illumination method, if you want the inside of the container to appear almost unlit (the light path is hard to perceive), which treatment should be prioritized?
A. Filter the liquid through a 0.2 μm microporous membrane.
B. Gently heat the liquid to about 40 °C.
C. Add a small amount of table salt and dissolve it completely.
D. Give the liquid a light stir.
Clues:
1. A transparent container is filled with a liquid.
2. A pink, horizontal line of light passes through the liquid in the container.
3. The path of the light beam is visible inside the liquid, indicating light scattering.
4. The liquid itself appears clear, suggesting the scattering particles are microscopic (colloidal).
5. A person in a white and blue shirt is in the background, out of focus.
Answer: A
Category: Physics