The amplitude of a damped oscillator decreases to

Question:

The amplitude of a damped oscillator decreases to $0.9$ times its original magnitude in $5 \mathrm{~s}$. In another $10 \mathrm{~s}$ it will decrease to a times its original magnitude, where a equals:

 

  1. $0.81$

  2. $0.729$

  3. $0.6$

  4. $0.7$


Correct Option: , 2

Solution:

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