A: If vacuum is not created inside an X -ray tube, X-rays will not be produced.
R: Without vacuum inside the X-ray tube the electrons are not emitted by the filament.

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

**Assertion (A):** If vacuum is not created inside an X-ray tube, X-rays will not be produced.

**Reason (R):** Without vacuum inside the X-ray tube, the electrons are not emitted by the filament.

### Step-by-Step Solution:

1. **Understanding the Assertion (A):**
- An X-ray tube is designed to produce X-rays by converting electrical energy into X-ray radiation.
- The tube must be maintained in a vacuum to prevent air molecules from interfering with the electron flow.
- If there is no vacuum, the presence of air can lead to scattering and absorption of electrons, thus preventing effective X-ray production.
- Therefore, the assertion is **true**: If vacuum is not created inside an X-ray tube, X-rays will not be produced.

2. **Understanding the Reason (R):**
- The filament in an X-ray tube emits electrons when heated (a process known as thermionic emission).
- While a vacuum is essential for the efficient operation of the X-ray tube, it does not mean that electrons cannot be emitted at all if there is no vacuum.
- In the presence of air, electrons can still be emitted, but their path will be disrupted by air molecules, leading to a decrease in efficiency and potential damage to the tube.
- Thus, the reason is **false**: Without vacuum inside the X-ray tube, the electrons are still emitted by the filament, but their effectiveness is compromised.

3. **Conclusion:**
- Since the assertion (A) is true and the reason (R) is false, we can conclude that the correct option is that the assertion is true but the reason is false.

### Final Answer:
The correct option is **3**: Assertion is true, but Reason is false.

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