If a simple pendulum has significant amplitude (up to a factor of 1/e of original) only in the period between t = 0 s to t = τ s,
If a simple pendulum has significant amplitude (up to a factor of 1/e of original) only in the period between t = 0 s to t = τ s, then t may be called the average life of the pendulum. When the spherical bob of the pendulum suffers a retardation (due to viscous drag) proportional to its velocity, with b as the constant of proportionality, the average life time of the pendulum is (assuming damping is small) in seconds
(a) b
(b) 1/b
(c) 2/b
(d) 0.693/b
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