The amplitude of damped oscillator decr...

The amplitude of damped oscillator decreased to `0.9` times its original magnitude is `5s`. In another `10s` it will decrease to `alpha` times its original magnitude, where `alpha` equals.

A

`0.7`

B

`0.81`

C

`0.729`

D

`0.6`

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The correct Answer is:

C

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