GRE question: oscilloscope with two oscillators

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The discussion centers around a GRE question involving an oscilloscope displaying two oscillators. The participant expresses confusion about why the correct answer is A, suggesting that typically a closed loop appears on the oscilloscope when two signals are plotted. They associate option D with signals of the same frequency but different amplitudes and initially assumed option E was correct. The conversation then shifts to questioning the relative frequencies of the signals in option E and how other options were eliminated. Clarification on these points is sought to understand the reasoning behind the correct answer.
Silviu
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Homework Statement


Hello! The problem is the one I attached.

Homework Equations

The Attempt at a Solution


They say the answer is A, but I am not sure why. From what I remember from lab class, when you put 2 signals on x and y-axis you get usually a closed loop, like D or E. I think D happens when you have the same frequency but different amplitudes so I assumed the answer is E. Can someone explain why is it A?

Thank you.
 

Attachments

  • GRE.png
    GRE.png
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In E, what would be the relative frequencies along X and Y?
 
DrClaude said:
In E, what would be the relative frequencies along X and Y?
Oh, I am not sure. I picked that just by elimination...
 
How did you eliminate the others then?
 

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