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GR0877 Problem 42

PROBLEM STATEMENT: This problem is still being typed.

SOLUTION: (E) From the picture we see that the period of oscillations (this is 2\pi phase difference) is approximately 6 cm, while the difference between two points of equal voltage-level (say, zero-level) for two waveforms is 2 cm. Thus, the phase difference between waveforms is 2 \cdot 2 \pi/6 = 2\pi/3.

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Categories: 0877 Tags: , , , ,
  1. DB
    08.11.2011 at 14:36

    How do you know it’s 120 and not 90?

  2. mark
    11.11.2011 at 17:37

    So, there are 3 squares for every 90 degrees. If you look at the shift in Channel 2 to the right, you end up with ~4 squares difference, which implies 4/3*90=120. If you shift it to the left, you need to by ~2, so that 2/3*90 = 60.

    Is there some reason why it couldn’t be 60?

    • 12.11.2011 at 16:47

      mark :

      So, there are 3 squares for every 90 degrees.

      Wrong. 180 degrees.

  3. 12.11.2011 at 16:50

    DB :

    How do you know it’s 120 and not 90?

    Well, did you read the solution (carefully)? I think it’s clear.

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