If a pendulum has significant amplitude (up to a factor of 1"/"e of original) only in the period between t= 0s" 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 viscos drag) proportional to into velocity with 'b' as the constant of proportionally, the average life time of pendulum is (assuming damping is small) in seconds.

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

1.	If a pendulum has significant amplitude (up to a factor of 1"/"e of original) only in the period between t= 0s" 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 viscos drag) proportional to into velocity with 'b' as the constant of proportionally, the average life time of pendulum is (assuming damping is small) in seconds.
Answer» `(0.693)/(B)` `b` `(1)/(b)` `(2)/(b)` ANSWER :D