Albedo is a measurement of the percentage of light that is :-

Options

A. Absorbed by an object surface
B. Converted into sugar by photosynthesis
C. Reflected by surface
D. Reflected by atmosphere

Answer

**Step-by-Step Solution:**

1. **Understanding Albedo**: Albedo is defined as a measure of reflectivity of a surface. It quantifies how much light or solar radiation is reflected by that surface compared to the total amount of incoming radiation.

2. **Identifying the Formula**: The formula for calculating albedo is:
\[ \text{Albedo} = \frac{\text{Reflected Solar Radiation}}{\text{Total Incoming Solar Radiation}} \times 100 \]
This formula indicates that albedo is expressed as a percentage.

3. **Analyzing the Options**: The question provides four options regarding what albedo measures:
- Absorbed by an object surface
- Converted into sugar by photosynthesis
- Reflected by a surface
- Reflected by atmosphere

4. **Evaluating Each Option**:
- **Absorbed by an object surface**: This option is incorrect because albedo specifically measures reflectivity, not absorption.
- **Converted into sugar by photosynthesis**: This option is also incorrect as it pertains to a biological process, not reflectivity.
- **Reflected by a surface**: This is the correct option since albedo measures how much light is reflected by a surface.
- **Reflected by atmosphere**: This option is incorrect because albedo refers to the reflectivity of surfaces, not the atmosphere.

5. **Conclusion**: Based on the analysis, the correct answer is that albedo is a measurement of the percentage of light that is **reflected by a surface**.

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