The motion of the beam on the oscilloscope screen is described by plots of x and y coordinates versus time. What picture will appear on the screen when au_y = au_x, au_x/3, 3 au_x? Consider the two cases (see figure 1.1.17). In case a, the horizontal lines are almost invisible on the screen. Why? At what ratio of au_x and au_y in case b is the trajectory of the beam on the screen closed?

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    <h3 id="back-link"><a href="/#1.1">$\leftarrow$Back</a></h3>

    <h3> Statement </h3>
    <p>
        $1.1.17.$ The motion of the beam on the oscilloscope screen is described by plots of $x$ and $y$ coordinates versus time. What picture will appear on the screen when $\tau_y = \tau_x$, $\tau_x/3$, $3 \tau_x$? Consider the two cases (see figure 1.1.17). In case a, the horizontal lines are almost invisible on the screen. Why? At what ratio of $\tau_x$ and $\tau_y$ in case b is the trajectory of the beam on the screen closed?

    <h3>Solution</h3>
    <p>
        <center>
          <figure>
            <img id="sol1" src="sol1.png"
              loading="lazy" alt="1.1.17" width="200" />
          </figure>
        </center>
          <p>
          	a) The return of the beam along the coordinate $x$ takes very little time, respectively, few electrons fall per unit length of the luminescent surface of the screen. 
        </p>

        </center>
          <p>
            b) when $\tau_y/\tau_x = m/n$, where $m$ and $n$ are any integers.
        </p>

        <center>
          <figure>
            <img src="sol2.png"
              loading="lazy" alt="1.1.17" width="200" />
          </figure>
        <br>
      </center>

    </p>

    <h4>Answer</h4>
    <p>
        <a href="#sol1">See Fig.</a>
    </p>



    <p style="text-align: right; font-style: italic; font-size: 14;">   
      Aliaksandr Melnichenka<br>
    </p>
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