Phenomena associated with scattering is/are

Options

A. blue colour of the sky
B. appearance of reddish sun during sunset and sunrise
C. both (a) and (b)
D. None of these

Explanation

To solve the question regarding the phenomena associated with scattering, we will analyze the options provided and explain the reasoning behind each one.

### Step-by-Step Solution:

1. **Understanding Scattering**:
- Scattering is a phenomenon where light rays deviate from their straight path when they encounter obstacles such as gas molecules, dust particles, or water vapors.

**Hint**: Remember that scattering occurs when light interacts with small particles in its path.

2. **Analyzing Option A - Blue Color of the Sky**:
- The blue color of the sky is due to Rayleigh scattering, which occurs when sunlight interacts with small particles in the atmosphere. Blue light has a shorter wavelength and is scattered more than other colors, making the sky appear blue.

**Hint**: Consider how different wavelengths of light are affected by scattering.

3. **Analyzing Option B - Reddish Sun During Sunset and Sunrise**:
- During sunset and sunrise, the sun is near the horizon, and its light has to pass through a larger volume of the atmosphere. This longer path causes more scattering of shorter wavelengths (blue and green light), allowing the longer wavelengths (red and orange light) to dominate, making the sun appear reddish.

**Hint**: Think about how the position of the sun affects the distance light travels through the atmosphere.

4. **Conclusion**:
- Both phenomena (the blue sky and the reddish sun during sunset and sunrise) are associated with scattering. Therefore, both options A and B are correct.

5. **Final Answer**:
- The correct answer is option C: both A and B.

### Summary:
The phenomena associated with scattering include the blue color of the sky and the appearance of a reddish sun during sunset and sunrise. Hence, the correct choice is both A and B.