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The displacement of a damped harmonic os...

The displacement of a damped harmonic oscillator is given by x(t)=`e^(-0 1t) cos(10pit+phi)` . Here t is in seconds. The time taken for its amplitude of vibration to drop to half of its initial value is close to:

A

13s

B

7s

C

4s

D

27s

Text Solution

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The correct Answer is:
D
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