Lissajous patterns on a CRO has ten vertical maximum values and eight horizontal maximum values. The frequency of the horizontal input is 1000 Hz. Determine the frequency of the vertical input?

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  1. 800 Hz
  2. 1000 Hz
  3. 1256 Hz
  4. 1344 Hz

Answer (Detailed Solution Below)

Option 1 : 800 Hz
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Detailed Solution

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Concept

The unknown to the known frequency for Lissajous patterns on a Cathode Ray Oscilloscope (CRO) is given by:

\(f_y=f_x({n_x\over n_y})\)

where, fy = Vertical frequency

fx = Horizontal frequency

nx = No. of horizontal tangencies

ny = No. of vertical tangencies

Calculation

Given, ny = 10 and nx = 8

fx = 1000 Hz

\(f_y=1000\times ({8\over 10})\)

fy = 800 Hz

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