Assertion : Orbital velocity of a satellite is greater than its escape velocity.
Reason : Orbit of a satellite is within the gravitational field of earth whereas escaping is beyond the gravitational field of earth.

Options

A. Assertion is correct, reason is correct, reason is a correct explanation for assertion.
B. Assertion is correct, reason is correct, reason is not a correct explanation for assertion
C. Assertion is correct, reason is incorrect
D. Assertion is incorrect, reason is correct

Answer

To solve the question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding Orbital Velocity**:
- The orbital velocity of a satellite is the speed required for it to maintain a stable orbit around a celestial body (like Earth). This velocity depends on the mass of the celestial body and the radius of the orbit.
- Formula: \( v_o = \sqrt{\frac{GM}{r}} \)
where \( G \) is the gravitational constant, \( M \) is the mass of the celestial body, and \( r \) is the distance from the center of the celestial body to the satellite.

2. **Understanding Escape Velocity**:
- The escape velocity is the minimum speed needed for an object to break free from the gravitational attraction of a celestial body without any further propulsion.
- Formula: \( v_e = \sqrt{2GM/r} \)
- This means that escape velocity is always greater than orbital velocity.

3. **Comparing the Two Velocities**:
- From the formulas, we can see that:
\[ v_e = \sqrt{2} \cdot v_o \]
- This indicates that escape velocity (\( v_e \)) is greater than orbital velocity (\( v_o \)).

4. **Analyzing the Assertion**:
- The assertion states that "the orbital velocity of a satellite is greater than its escape velocity." This is incorrect based on our calculations.

5. **Analyzing the Reason**:
- The reason states that "the orbit of a satellite is within the gravitational field of Earth whereas escaping is beyond the gravitational field of Earth."
- This statement is true, as a satellite in orbit is indeed within the gravitational influence of Earth, while escape velocity refers to moving beyond this influence.

6. **Conclusion**:
- Since the assertion is false and the reason is true, the correct answer is that the assertion is incorrect but the reason is correct.

### Final Answer:
- The assertion is false, and the reason is true. Therefore, the correct option is that the assertion is incorrect, and the reason is correct.