Question

A lissajous pattern, as shown in the figure below, is observed on the screen of a CRO when voltages of frequencies $f_{x}andfy$ are applied to be $xandy$ plates respectively. $f_x:f_y$ is then equal to

• A. 3 : 2
• B. 1 : 2
• C. 2 : 3
• D. 2 : 1

Answer 1

The correct option is C 2 : 3


Maximum number of intersection of a horizontal line with Lissajous Pattern = 3
Maximum number of intersection of a horizontal line with Lissajous Pattern = 2
$\therefore \frac{f_x}{f_y}=\frac{2}{3}$