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 = T sec, then T may be called the average life of the pendulum. When the spherical bob of the pendulum of mass 1kg suffers a retardation (due to viscous drag) proportional to into velocity with .b. as the constant of proportionality, the average life time of pendulum is (assuming damping is small) in seconds,

If a simple pendulum has significant amplitude (up to a factor of 1/e

1.	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 = T sec, then T may be called the average life of the pendulum. When the spherical bob of the pendulum of mass 1kg suffers a retardation (due to viscous drag) proportional to into velocity with .b. as the constant of proportionality, the average life time of pendulum is (assuming damping is small) in seconds,
Answer» `0.693/B` b `1/b` `2/b` ANSWER :D