## Essential University Physics: Volume 1 (3rd Edition)

We use the equation for the period of a pendulum to find: $T = 2\pi\sqrt{\frac{L}{g}}=2\pi\sqrt{\frac{1.45 \ m}{9.81\ m/s^2}}=2.4156\ s$ The tick occurs every half period, which is $\frac{2.4156\ s}{2} = \fbox{1.21 seconds}$