A) \[20.76\]
B) \[34.76\]
C) \[15.46\]
D) \[28.6\]
Correct Answer: D
Solution :
The time in which amplitude decreased to 1/e to its original value of the damped oscillation is called relaxation time \[(\tau )\] \[\tau \,=1/b\] where b is damping factor in unit per second \[A={{A}_{0}}{{e}^{-bt}}\] \[5={{10}_{e}}^{-b\,20}\] \[\tau =1/b=20/\ln \] \[\tau =\,\frac{20}{693}\,=28.6\]You need to login to perform this action.
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