A certain square wave has a period of 4 msec. Its fundamental frequency will be

Concept:

A square wave is represented as:

The fundamental frequency for a square wave is the inverse of the time period, i.e.

\(f=\frac{1}{T}\)

Calculation:

With T = 4 msec, the fundamental frequency will be:

\(f=\frac{1}{4\times 10^{-3}}=250~Hz\)

Important Note: A square wave is a combination of many frequencies, i.e.

f_square = f0 + f₁ + f₂ + ... + f_n

f₀ = fundamental frequency

f₁, f₂, ...f_n are the harmonics, i.e. multiples of the fundamental frequency