Question: Due to a certain cause the free electrons in a plane copper plate shifted over a small distance x at right angles to its surface.

Due to a certain cause the free electrons in a plane copper plate shifted over a small distance x at right angles to its surface. As a result, a surface charge and a corresponding restoring force emerged, giving rise to so-called plasma oscillations. Find the angular frequency of these oscillations if the free electron concentration in copper is n = 0.85.1029 m –1.

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