A periodic rectangular signal X(t) has the wave form shown

A periodic rectangular signal X(t) has the wave form shown in the figure. Frequency of the fifth harmonic of its spectrum is

Periodic time = 4 ms = 4 × 10^{– 3} sec.

Fundamental frequency =	10³	= 250 Hz
	4

∴ Frequency of the 5th harmonic = 250 × 5 = 1250 Hz