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Homework Help: GRE question: oscilloscope with two oscillators

  1. Feb 28, 2017 #1
    1. The problem statement, all variables and given/known data
    Hello! The problem is the one I attached.

    2. Relevant equations

    3. 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.

    Attached Files:

    • GRE.png
      File size:
      89.1 KB
  2. jcsd
  3. Feb 28, 2017 #2


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    Staff: Mentor

    In E, what would be the relative frequencies along X and Y?
  4. Feb 28, 2017 #3
    Oh, I am not sure. I picked that just by elimination...
  5. Feb 28, 2017 #4


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    Staff Emeritus
    Science Advisor
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    Education Advisor

    How did you eliminate the others then?
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