Why is the movement of the atoms in the chain the same when multiples of 2x /a are added to, or subtracted from, the wave vector?

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4) Why is the movement of the atoms in the chain the same when multiples of
2n /a are added to, or subtracted from, the wave vector?
Transcribed Image Text:4) Why is the movement of the atoms in the chain the same when multiples of 2n /a are added to, or subtracted from, the wave vector?
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