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The X-rays cannot be diffracted by means of an ordinary grating because of

1. high speed
2. short wavelength
3. large wavelength
4. none of these

Correct answer: short wavelength

Solution

X-rays have a very short wavelength, much smaller than the spacing of lines in an ordinary diffraction grating, making diffraction impossible. Instead, X-ray diffraction requires crystal lattices with atomic-scale spacing.

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