What will be the colour of sky as seen from the earth, if there were no atmosphere

Options

A. Black
B. Blue
C. White
D. Red

Explanation

To determine the color of the sky as seen from Earth if there were no atmosphere, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Role of Atmosphere**:
- The Earth's atmosphere contains gases and particles that scatter sunlight. This scattering is responsible for the blue color of the sky during the day.

2. **Rayleigh Scattering**:
- The phenomenon of scattering is described by Rayleigh's law, which states that the amount of scattering is inversely proportional to the fourth power of the wavelength of light. This means shorter wavelengths (like violet and blue) scatter more than longer wavelengths (like red).

3. **Color of Scattered Light**:
- In the presence of an atmosphere, shorter wavelengths (blue and violet) are scattered in all directions, making the sky appear blue to our eyes. However, violet light scatters even more than blue light, but our eyes are more sensitive to blue light.

4. **Absence of Atmosphere**:
- If there were no atmosphere, there would be no particles to scatter sunlight. Therefore, the scattering phenomenon would not occur.

5. **Conclusion**:
- Without scattering, the sky would not appear blue or any other color; instead, it would appear black, similar to how it looks from space, where there is no atmosphere to scatter light.

### Final Answer:
If there were no atmosphere, the color of the sky as seen from Earth would be black.

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