If an external force with angular frequency \( \omega_{d} \) acts o...

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If an external force with angular frequency \( \omega_{d} \) acts on an oscillating system with natural frequency
\( \mathrm{P} \) \( \omega \), the system oscillates :

W
(1) with angular frequency \( \omega \)
(2) with angular frequency \( \omega_{d} \)
(3) with angular frequency \( \frac{\omega+\omega_{\mathrm{d}}}{2} \)
(4) None of these
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