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Assume that the de-Broglie were associat...

Assume that the de-Broglie were associated with an electron can form a standing wave between the atoms arranged in a one dimensional array with nodes at each of the atomic sites. It is found that one such standing wave is formed if the distance d between the atoms of the array is `2 Å`. A similar standing wave is again formed if d is increased to `2.5 Å` but not for any intermediate value of d. Find the energy of the electron in eV and the least value of d for which the standing wave of the type described above can form.

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150 eV , 0.5 Å
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