The X-ray cannot be diffracted by means of an ordinary grating due to

Options

A. large wavelength
B. high speed
C. short wavelength
D. All of the above

Answer

To solve the question "The X-ray cannot be diffracted by means of an ordinary grating due to," we will analyze the concept of diffraction and the properties of X-rays.

### Step-by-Step Solution:

1. **Understanding Diffraction**:
- Diffraction is the bending of waves around obstacles or the spreading of waves when they pass through small openings. It occurs when the size of the obstacle or aperture is comparable to the wavelength of the wave.

**Hint**: Recall the definition of diffraction and its dependence on the size of obstacles relative to the wavelength.

2. **Wavelength of X-rays**:
- X-rays have a very short wavelength, typically in the range of 1 to 10 nanometers (nm). This is significantly smaller than the wavelengths of visible light.

**Hint**: Remember that the wavelength of X-rays is much shorter than that of visible light and other electromagnetic waves.

3. **Ordinary Grating**:
- An ordinary grating consists of closely spaced slits or obstacles. For diffraction to occur effectively, the spacing of the grating must be comparable to the wavelength of the light being used.

**Hint**: Consider how the size of the grating elements relates to the wavelength of the wave being diffracted.

4. **Comparison of Wavelength and Grating Size**:
- Since the wavelength of X-rays is much smaller than the spacing of the slits in an ordinary grating, the condition for diffraction is not satisfied. The grating does not have obstacles that are comparable in size to the wavelength of the X-rays.

**Hint**: Think about why the size of the grating matters when it comes to the wavelength of the wave.

5. **Conclusion**:
- Therefore, X-rays cannot be diffracted by ordinary gratings because the wavelength of X-rays is too short compared to the size of the grating elements.

**Final Answer**: The X-ray cannot be diffracted by means of an ordinary grating due to its short wavelength.

### Summary of the Answer:
The correct reason is that X-rays have a very short wavelength (1 to 10 nm), which is not comparable to the size of the obstacles in an ordinary grating, making diffraction impossible.