A stationary closed Lissajous pattern has 3 horizontal tangencies and 2 vertical tangencies. The horizontal input is 3 kHz. The vertical input frequency is
For a closed Lissajous pattern, the frequency ratio is given by the corresponding tangency counts. Horizontal tangencies occur at extrema of the vertical oscillation, and vertical tangencies at extrema of the horizontal oscillation.
Thus $f_y/f_x=3/2$. With fx=3 kHz, $f_y=(3/2)3=$ **4.5 kHz, D**.
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