Which one of the following statement is correct?

Options

A. a. A single geostationary satellite can cover the whole part of the earth for microwave communication.
B. b. Atleast three geotationary satellities in the same orbit around earth can cover the whole part of the earth for microwave communication.
C. c. The first Indian communication satellite is Telstar.
D. d.The satellite communication is not like the line of sight microwave communication.

Explanation

To determine which statement is correct regarding geostationary satellites and their coverage of the Earth, we can analyze the options provided:

1. **Understanding Geostationary Satellites**:
- A geostationary satellite orbits the Earth at an altitude where its orbital period matches the Earth's rotation period (24 hours). This means it appears to be stationary relative to a point on the Earth's surface.

2. **Coverage of the Earth**:
- A single geostationary satellite can cover only a specific portion of the Earth's surface. In fact, it can cover approximately one-third of the Earth’s surface due to its position above the equator.
- To cover the entire Earth, multiple geostationary satellites are needed. Specifically, at least three satellites positioned in the same orbit but spaced apart can provide complete coverage.

3. **Evaluating the Options**:
- **Option A**: A single geostationary satellite can cover the whole part of the Earth. (Incorrect)
- **Option B**: At least three geostationary satellites are required to cover the whole part of the Earth. (Correct)
- **Option C**: The first Indian satellite is Telstar. (Incorrect; the first Indian satellite was Aryabhata)
- **Option D**: Satellite communication is not like the line of sight of microwave communication. (Incorrect; satellite communication does rely on line of sight)

4. **Conclusion**:
- The correct statement is **Option B**: At least three geostationary satellites are required to cover the whole part of the Earth.