Two identical simple pendulums A and B are fixed at same point. They are displaced by very small angles `alpha` and `beta ( beta gt alpha)` and released from rest. Find the time after which B reaches its initial position for the first time. Collisions are elastic and length of strings is `l`.

Options

A. `pisqrt(l/g)`
B. `2pisqrt(l/g)`
C. `(pibeta)/alphasqrt(l/g)`
D. `(2pibeta)/alphasqrt(l/g)`

Answer

B