![An ideal square wave with period of 20 ms shown in the figure, is passed through an ideal low](https://www.gkseries.com/blog/wp-content/uploads/2023/10/An-ideal-square-wave-with-period-of-20-ms-shown-in-the-figure-is-passed-through-an-ideal-low.jpg)
Q. An ideal square wave with period of 20 ms shown in the figure, is passed through an ideal low pass filter with cut-off frequency 120 Hz. Which of the following is an accurate description of the output?
![](https://www.gkseries.com/blog/wp-content/uploads/2023/10/image-18.png)
A. Output is zero.
B. Output consists of both 50 Hz and 100 Hz frequency components.
C. Output is a pure sinusoid of frequency 50 Hz.
D. Output is a square wave of fundamental frequency 50 Hz.
Ans: Output is a pure sinusoid of frequency 50 Hz