Assertion: The surface wave propagation is used for medium wave band and for television broadcasting.
Reason: The surface waves travel directly from transmitting antenna to receiver antenna through atmosphere.

Options

A. Statetment-I is True, Statement-II is True , Statement-II is a correct explanation for Statement-I
B. Statement-I is True, Statement-II is True , Statement-II is NOT a correct explanation for Statement-I
C. Statement-I is True, Statement-II is False
D. Statement-I is False, Statement-II is True

Answer

To analyze the given assertion and reason, we can break down the problem into clear steps.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "The surface wave propagation is used for medium wave band and for television broadcasting."
- Surface wave propagation is indeed utilized in medium wave (MW) radio broadcasting, which typically operates in the frequency range of 530 kHz to 1700 kHz. This method allows for the transmission of radio signals over long distances by following the curvature of the Earth.

2. **Understanding the Reason**:
- The reason states that "The surface waves travel directly from transmitting antenna to receiver antenna through atmosphere."
- This statement is partially true. Surface waves do propagate along the surface of the Earth and can be affected by the atmosphere, but they do not travel "directly" in a straight line like electromagnetic waves in free space. Instead, they follow the contour of the Earth and can reflect off the ionosphere, which is crucial for long-distance communication.

3. **Evaluating the Truth of Both Statements**:
- Both the assertion and the reason are true. The assertion correctly identifies the use of surface wave propagation in medium wave broadcasting, and the reason describes the nature of surface wave propagation, albeit with some simplification.

4. **Determining the Relationship**:
- The reason provides an explanation for the assertion. Surface waves do indeed propagate in a way that allows them to be used for broadcasting, and the description of their travel aligns with the principles of surface wave propagation.

5. **Conclusion**:
- Since both the assertion and reason are true, and the reason explains the assertion, we conclude that the correct answer is that both statements are true, and the reason is the correct explanation for the assertion.

### Final Answer:
- Both the assertion and reason are true, and the reason is the correct explanation for the assertion.