The X- rays beam coming from an X- rays tube will be

Options

A. monochromatic
B. having all wavelength larger than a certain minimum wavelength
C. having alll wavelengths smaller than a certain maximum wavelenth
D. having all wavelength between a minimum and a maximum wavelength

Answer

To determine the nature of the X-ray beam coming from an X-ray tube, we can analyze the options provided and the characteristics of X-rays produced in such a tube.

### Step-by-Step Solution:

1. **Understanding X-ray Production**:
- X-rays are produced in an X-ray tube when high-speed electrons collide with a target material. This process can result in two types of X-rays: continuous (bremsstrahlung) and characteristic X-rays.

2. **Continuous X-rays**:
- Continuous X-rays are produced when electrons are decelerated upon hitting the target. This deceleration leads to the emission of X-rays with a range of wavelengths. Therefore, these X-rays are not monochromatic.

3. **Characteristic X-rays**:
- Characteristic X-rays are emitted when electrons transition between energy levels in the target atoms. These X-rays have specific wavelengths corresponding to the energy differences between the levels, but they still cover a range of wavelengths depending on the target material.

4. **Analyzing the Options**:
- **Option A**: "The X-ray beam is monochromatic" - This is incorrect because the X-ray beam consists of multiple wavelengths.
- **Option B**: "X-ray beam have wavelength larger than a certain minimum wavelength" - This is also incorrect as X-rays can have wavelengths smaller than a certain maximum wavelength.
- **Option C**: "X-ray wavelengths have all wavelengths smaller than a certain maximum wavelength" - This is partially correct, but it does not account for the minimum wavelength.
- **Option D**: "Having wavelength between a minimum and a maximum wavelength" - This option correctly describes the nature of the X-ray beam, as it encompasses the range of wavelengths produced.

5. **Conclusion**:
- The correct answer is **Option D**: The X-ray beam coming from an X-ray tube has wavelengths between a minimum and a maximum wavelength.