JEE Main2019Physics
Q.
The displacement of a damped harmonic oscillator is given by x(t) = e–0.1t cos (10t + ). 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
7 s
- B
27 s
- C
13 s
- D
4 s
Solution
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