Question

Name the device which whose periodic motion was used for making clock till recently

Answer 1

A phase-locked loop or phase lock loop (PLL) is a control system that generates an output signal whose phase is related to the phase of an input signal. There are several different types; the simplest is an electronic circuitconsisting of a variable frequency oscillatorand a phase detector in a feedback loop. The oscillator generates a periodic signal, and the phase detector compares the phase of that signal with the phase of the input periodic signal, adjusting the oscillator to keep the phases matched.

Answer 2

Answer:pendulum

Explanation:Hope it was helpful