Electron diffraction (Davisson–Germer) and Bragg law (2d sin θ = nλ with de Broglie λ = h/p)
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2d sin θ = nλ with de Broglie λ = h/p
What each symbol means
| Symbol | What it stands for |
|---|---|
| d | Interplanar spacing (m) |
| n | Order of diffraction (integer) |
| θ | Glancing angle (Bragg angle as used in NCERT setup) |
| λ | de Broglie wavelength of electrons |
When to use this
Crystalline planes produce constructive interference when path difference 2d sin θ = nλ. Experiments confirm λ = h/p for electrons.