Choose an appropriate option that correctly defines periodic signals.Group of answer choicesNoneThe signal that changes with timeThe signal that repeats itself in timeThe signal that changes with frequency

A discrete time periodic signal is defined as x(n)= x(n+N), what is the significance of N?Group of answer choicesSamples/ twice cycleNoneSamples/CycleRate of change of the period

What do you mean by fundamental period?Group of answer choicesThe last interval of a periodic signalEvery interval of a periodic signalThe first interval of a periodic signalEvery interval of an aperiodic signal

Which of the following correctly describes frequency?

The sum of two sinusoids is periodic provided that their frequencies are______ of a fundamental frequency.

Q.(1) Determine whether the following DT signals are periodic or not. If periodic, find the period.(a) x[n]= cos(0.3 πn) u[n] (b) x [n]= cos(0.3 πn+0.5 π) u[n](c) x[n]= cos(0.3 πn)+ cos(0.5 πn) (d) x [n]= cos(0.3 n) u[n