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b)
de-Broglie equation:
p
h
=
λ
h
= Planck’s constant
p
= momentum of the electrones
m
p
U
e
⋅
=
⋅
2
2
U
e
m
h
⋅
⋅
⋅
=
λ
2
m
= electron mas,
e
= electron charge
Fig. 1 Schematic representation to Debye-Scherrer diffraction
Fig. 2 Circuit of the diffraction tube, 0 - 50 V DC focussing voltage (optional)