If the amplitudes of a damped harmonic oscillator at times t=0, \(t_1\) and \(t_2\) are \(A_0\), \(A_1\) and \(A_2\) respectively, then the amplitude of the oscillator at a time of \((t_1+t_2)\) is
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For any quantity that decays exponentially, such as amplitude in damped oscillations or population in radioactive decay, the value at a time \(t_1+t_2\) is related to the values at \(t_1\) and \(t_2\) by \(A(t_1+t_2) = A(t_1)A(t_2)/A_0\), where \(A_0\) is the initial value.