MCQ Practice Question Signals & SystemsPeriodic Signals The fundamental period of x(t)=cos(20pi t) is? A0.01 s B0.05 s C0.1 s D0.2 s Show AnswerHide AnswerReport an error Correct Answer: C. 0.1 s Explanation: Here omega=20pi rad/s, so f=10 Hz and T=1/f=0.1 s.Reference: Standard signals and systems: periodic signals