A : Long distance radio broadcasts use short-wave bands.
R : Ionosphere reflects waves in these bands.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
C. If assertion is true statement but Reason is false, then mark (3)
D. If both Assertion and Reason are false statements, then mark (4)

Answer

To solve the question, we need to analyze both the assertion (A) and the reason (R) provided:

**Assertion (A):** Long distance radio broadcasts use short-wave bands.
**Reason (R):** Ionosphere reflects waves in these bands.

### Step-by-Step Solution:

1. **Understanding the Assertion:**
- Long distance radio broadcasts are designed to transmit signals over vast distances.
- Short-wave bands are a specific range of frequencies that are particularly effective for long-distance communication.

**Hint:** Consider why certain frequencies are better for long distances compared to others.

2. **Understanding the Reason:**
- The ionosphere is a layer of the Earth's atmosphere that is ionized by solar radiation.
- It has the ability to reflect certain radio waves back to the Earth's surface, which is crucial for long-distance communication.
- Short-wave radio frequencies can be reflected by the ionosphere, allowing them to travel beyond the horizon.

**Hint:** Think about how the ionosphere interacts with different frequencies of radio waves.

3. **Connecting Assertion and Reason:**
- The assertion states that long-distance radio broadcasts use short-wave bands, and the reason explains that this is possible because the ionosphere reflects these waves.
- Therefore, the reason (R) provides a valid explanation for the assertion (A).

**Hint:** Analyze the relationship between the two statements to see if one logically supports the other.

4. **Conclusion:**
- Both the assertion and the reason are true.
- The reason is indeed the correct explanation for the assertion.

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

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