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In the Davisson-Germer experiment, atoms in a crystal lattice form a reflective diffraction grating for the electrons. In the animation, you can change the accelerating voltage, V, or the initial energy of the impacting electrons. The kinetic energy of the electrons is equal to the energy given the electron in the acceleration region. In the animation, the detector moves to the point of maximum signal intensity, the first order diffraction pattern (the angle of the detector is given in degrees).   What is the spacing between the atoms?   Restart.