In an `X` - rays tube , the intensity of the emitted `X` - rays beam is increased by

Options

A. increasing the filment current
B. decreasing the filment current
C. increasing the target potential
D. decreasing the target potential

Answer

To solve the problem of how to increase the intensity of the emitted X-ray beam in an X-ray tube, we need to analyze the options provided based on the principles of how X-rays are produced.

### Step-by-Step Solution:

1. **Understanding X-ray Production**:
- In an X-ray tube, electrons are emitted from the cathode and accelerated towards the anode. When these high-energy electrons collide with the anode material, X-rays are produced.
- The intensity of the X-ray beam is related to the number of X-rays produced per unit time.

2. **Analyzing the Options**:
- **Option A: Increasing the filament current**:
- Increasing the filament current leads to a higher temperature of the filament, which in turn increases the number of electrons emitted from the cathode (due to thermionic emission).
- More electrons hitting the anode means more X-rays are produced, thus increasing the intensity of the X-ray beam.
- **Conclusion**: This option will increase the intensity of the X-ray beam.

- **Option B: Decreasing the filament current**:
- Decreasing the filament current will reduce the temperature of the filament, resulting in fewer electrons being emitted.
- Fewer electrons hitting the anode means fewer X-rays produced, thus decreasing the intensity of the X-ray beam.
- **Conclusion**: This option will decrease the intensity of the X-ray beam.

- **Option C: Increasing the target potential**:
- Increasing the target potential increases the kinetic energy of the electrons as they strike the anode.
- While this can increase the energy of the emitted X-rays, it does not necessarily increase the number of X-rays produced per unit time.
- **Conclusion**: This option does not increase the intensity of the X-ray beam.

- **Option D: Decreasing the target potential**:
- Decreasing the target potential would reduce the kinetic energy of the electrons, leading to less energetic X-rays and potentially fewer X-rays being produced.
- **Conclusion**: This option will also decrease the intensity of the X-ray beam.

3. **Final Answer**:
- The correct option to increase the intensity of the emitted X-ray beam is **Option A: Increasing the filament current**.