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Lissajous Pattern-1

A lissajous p...

Question

A lissajous pattern on the oscilloscope is stationary and has six horizontal tangencies and five vertical tangencies. The frequency of horizontal input is 1500 Hz. Then the frequency of vertical input is

A

1500 Hz

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B

1800 Hz

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C

1250 Hz

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D

2100 Hz

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Solution

The correct option is B 1800 Hz
$\frac{V e r t i c a l i n p u t f r e q u e n c y}{H o r i z o n t a l i n p u t f r e q u e n c y} = \frac{f_{y}}{f_{x}} = \frac{N o . o f h o r i z o n t a l t a n g e n c i e s}{N o . o f v e r t i c a l t a n g e n c i e s} = \frac{6}{5}$

$∴$ Vertical input frequency
$= f_{y} = \frac{6}{5} \times 1500 = 1800 H z$

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