__________ paint has the minimum absorption co-efficient.

ANS:B - White lead

White lead paint typically has the minimum absorption coefficient among the options provided. Explanation:

1. Absorption Coefficient: The absorption coefficient of a material represents its ability to absorb electromagnetic radiation, such as light. It is a measure of how much of the incident radiation is absorbed by the material and converted into other forms of energy, such as heat.
2. White Lead Paint: White lead paint, also known as lead carbonate or lead white, is a white pigment historically used in paints and coatings. It is known for its high opacity and ability to reflect light, which contributes to its whitening properties. Due to its reflective nature, white lead paint tends to absorb less light compared to darker colors like black or grey.
3. Black Paint: Black paint, on the other hand, absorbs most of the incident light across the visible spectrum, making it appear dark. It has a high absorption coefficient because it absorbs a significant portion of the incident light rather than reflecting or transmitting it.
4. Grey and Light Cream Paints: Grey and light cream paints fall between black and white in terms of their absorption characteristics. They absorb some amount of incident light but also reflect a portion of it. However, their absorption coefficients may vary depending on the specific formulation and pigments used in the paint.