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For x rays with wavelength 0.0300 nm, the m = 1 inten- sity maximum for a crystal occurs when the angle u in Fig. is 35.8°. At what angle u does the m = 1 maximum occur when a beam of 4.50 keV electrons is used instead? Assume that the electrons also scat- ter from the atoms in the surface plane of this same crystal.

(2 The electrons
are accelerated by
4 The detector can
be moved to detect
A heated filament
emits electrons.
scattered electrons
electrodes and
directed at a crystal.
at any angle u.
b
u
Voltage
source
Electron
beam
(in vacuum)
3 Electrons strike
a nickel crystal.
Vba
V - Va
Vba 7 0, so electrons speed up in moving from a to b.

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