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Damped Vibrations

When the natu...

Question

When the natural frequency of a body is equal to the frequency of an external periodic force is called

A

refraction

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B

reflection

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C

resonance

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Solution

The correct option is C resonance
When the frequency of the externally applied periodic force on a body is equal to its natural vibrations, the body begins to vibrate with an increased amplitude. This phenonenon is called resonance.

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Q. Assertion :Resonance is a special case of forced vibration in which the natural frequency of vibration of the body is the same as the impressed frequency of external periodic force and the amplitude of forced vibration is maximum. Reason: The amplitude of forced vibrations of a body increases with an increase in the frequency of the externally impressed periodic force.

Q. A weakly damped harmonic oscillator of frequency

n_{1}

is driven by an external periodic force of frequency

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. When the steady state is reached, the frequency of the oscillator will be

Q. Resonance is a special case of

-

vibrations, when frequency of the driving force is

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natural frequency of the body.

Q. A weakly damped harmonic oscillator of frequency

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is driven by an external periodic force of frequency

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. When the steady state is reached, the frequency of the oscillator will be

Complete the following sentence :

Resonance is a special case of ........ vibrations, when frequency of the driving force is ........... natural frequency of the drivens body.

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