A: The nature of the characteristic X -rays does not depend on accelerating potential.
R: X- rays are electromagnetic radiation.

Options

A. If both Assertion & Reason are true and the reason is the correct explantion of the assertion , then mark (1)
B. if both Assertion & Reason are true but the reason is not the correct explantion 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 problem, we need to analyze both the assertion (A) and the reason (R) provided in the question.

### Step 1: Analyze the Assertion (A)
The assertion states: "The nature of the characteristic X-rays does not depend on accelerating potential."

1. **Understanding Characteristic X-rays**: Characteristic X-rays are produced when high-energy electrons collide with a metal target (anode) and eject inner-shell electrons. When outer-shell electrons fall into the lower energy state, they emit X-rays with specific wavelengths characteristic of the material of the anode.

2. **Dependence on Accelerating Potential**: The accelerating potential affects the energy of the electrons and thus influences the continuous spectrum of X-rays. However, the wavelengths of the characteristic X-rays are determined by the atomic structure of the target material (anode) and not by the accelerating potential.

**Conclusion for Assertion**: The assertion is **True** because the nature of characteristic X-rays does not depend on the accelerating potential.

### Step 2: Analyze the Reason (R)
The reason states: "X-rays are electromagnetic radiation."

1. **Understanding X-rays**: X-rays are indeed a form of electromagnetic radiation, similar to visible light, but with much higher energy and shorter wavelengths.

2. **Relation to Assertion**: While the reason is true, it does not explain why the nature of characteristic X-rays does not depend on the accelerating potential. The reason simply states a fact about X-rays without linking it to the assertion.

**Conclusion for Reason**: The reason is **True**, but it does not correctly explain the assertion.

### Final Conclusion
Both the assertion and the reason are true statements, but the reason does not provide a correct explanation for the assertion. Therefore, the correct answer is that both A and R are true, but R is not the correct explanation of A.

### Summary of the Solution
- Assertion (A) is True.
- Reason (R) is True but does not explain A.
- Final answer: Both A and R are true, but R is not the correct explanation of A.