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+ <h2>Solutions of Savchenko Physics Textbook</h2>
+ <p class="author">
+ Aliaksandr Melnichenka <br/>
+ October 2023
+ </p>
+ </header>
+
+ <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?
+</p>
+<center>
+ <figure>
+ <img src="statement.png"
+ loading="lazy" width="320" />
+ <figcaption>
+ For problem $1.1.17$
+ </figcaption>
+ </figure>
+</center>
+<p>
+ </p>
+
+ <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>
+
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