(A): A wind is different from the sound wave in air.
(R): The wind involves motion of air from one place to the other. The sound wave involves compressions and rarefactions of layers of air.

Options

A. Both 'A' and 'R' are true and 'R' is the correct, explanation of 'A'.
B. Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A'
C. A' is true and 'R' is false
D. Both 'A' and 'R' are false

Answer

To solve the question, we need to analyze the assertion (A) and the reason (R) provided, and determine their truthfulness and relationship.

### Step 1: Analyze the Assertion (A)
The assertion states: "A wind is different from the sound wave in air."

- **Explanation**: Wind refers to the movement of air from one location to another, typically caused by differences in air pressure. In contrast, sound waves in air are disturbances that propagate through the medium (air) in the form of compressions and rarefactions. Thus, the assertion is true because wind and sound waves are fundamentally different phenomena.

### Step 2: Analyze the Reason (R)
The reason states: "The wind involves motion of air from one place to the other. The sound wave involves compressions and rarefactions of layers of air."

- **Explanation**: The first part of the reason correctly describes wind as the movement of air. The second part accurately describes sound waves as involving compressions and rarefactions, which are the variations in pressure that allow sound to travel through the air. Therefore, this reason is also true.

### Step 3: Determine the Relationship
Now, we need to check if the reason (R) correctly explains the assertion (A).

- **Explanation**: Since both the assertion and the reason are true, and the reason provides a valid explanation of why the assertion is correct (highlighting the difference between the movement of air in wind and the disturbance in sound waves), we conclude that R is indeed the correct explanation of A.

### Conclusion
Both A and R are true, and R is the correct explanation of A.

### Final Answer
The correct option is: **Both A and R are true and R is the correct explanation of A.**

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