19. what is the frequency of a square wave with a period of 0.75 microseconds?\na 250 hz\nb 750 hz\nc 1.3…

Explanation:

Step1: Recall frequency - period formula

The formula for frequency $f$ and period $T$ is $f=\frac{1}{T}$.

Step2: Convert period to SI unit

$T = 0.75\ \mu s=0.75\times10^{- 6}\ s$.

Step3: Calculate frequency

$f=\frac{1}{0.75\times10^{-6}\ s}=\frac{1}{0.75}\times10^{6}\ Hz\approx1.33\times10^{6}\ Hz = 1.33\ MHz\approx1.3\ MHz$.

Answer:

C. 1.3 MHz