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Amplitude, Frequency and Time Period

For an under ...

Question

For an under damped harmonic oscillator resonance

A

Occurs when excitation frequency is greater than undamped natural frequency

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B

Occurs when excitation frequency is less than undamped natural frequency

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C

Occurs when excitation frequency is equal to undamped natural frequency

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D

never occurs

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Solution

The correct option is C Occurs when excitation frequency is equal to undamped natural frequency
Resonance occurs when excitation frequency is equal to undamped natural frequency

$ω = ω_{n}$

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