Explain briefly diffraction of X-rays by crystals and derive Bragg’s law.
Explain briefly diffraction of X-rays by crystals and derive Bragg’s law.
A parallel beam of monochromatic X-rays incident on a crystal is reflected from successive atomic planes and super-imposed, forming an interference patterns
For constructive interference to occur, the path difference is equal to the whole number of wavelength
Thus BC + CD = nλ
dsinθ + dsinθ = nλ
or 2dsinθ = nλ where n = 1, 2, 3, 4 …
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CATEGORIES A-level modern physics
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