An electron experiences a quasi-elastic force \( k x \) and a "friction force" \( y x \) in the ...

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An electron experiences a quasi-elastic force \( k x \) and a "friction force" \( y x \) in the field of electromagnetic radiation. The \( E \)-component of the field varies as \( E=E_{0} \cos \omega t \). Neglecting the action of the magnetic component of the field, find
the motion equation of the electron;
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