1) The amplitude of a damped oscillator decreases to 0.9 times its original magnitude is 5 s. In another 10 s it will decrease 10 $\alpha$ times its original magnitude, where $\alpha$ equals, A) 0.7 B) 0.84 C) 0.729 D) 0.6 Answer: Option CExplanation:Amplitude decreases exponentially, In 5 s it remain 0.9 times .Therefore in total 15 s it will remains (0.9) (0.9)(0.9)= 0.729 times its original value
