diff --git a/physics/effetto_doppler.tex b/physics/effetto_doppler.tex
new file mode 100755
index 0000000..dcd4efd
--- /dev/null
+++ b/physics/effetto_doppler.tex
@@ -0,0 +1,63 @@
+\documentclass{standalone}
+%
+\usepackage{tikz}
+\usepackage{pgfplots}
+\usepackage{xcolor}
+\usepackage{fontspec}
+\setmainfont{Montserrat}
+%
+\title{Effetto Doppler}
+\begin{document}
+	\tikzset{
+		partial ellipse/.style args = {#1:#2:#3}{insert path={+ (#1:#3) arc (#1:#2:#3)}},
+		human/.pic = {
+			\draw [fill] (0,0) circle (0.3cm);
+			\draw [thick] (0,0) circle -- (0,-1.5);
+			\draw [thick] (-0.5,-1) -- (0,-0.5) -- (0.5,-1);
+			\draw [thick] (-0.5,-2) -- (0,-1.5) -- (0.5,-2);
+		},
+		ambulance/.pic = {
+			\draw [fill=red, thick] (4,0) -- (4.1,0.6) -- (4.5,0.6) -- (4.6,0) -- (4,0);
+			\draw [fill=white, thick] (0,0) -- (5,0) -- (6,-3) -- (6.5,-3.2) -- (6.5,-4) -- (-1,-4) -- (0,0);
+			\draw [fill=red, thick] (6.5,-3.7) -- (-0.92,-3.7) -- (-0.87,-3.5) -- (6.5,-3.5) -- (6.5,-3.7);
+			\draw [thick] (-0.12,-0.5) -- (5.17,-0.5);
+			\draw [fill=red, thick] (4,0) -- (4.1,0.6) -- (4.5,0.6) -- (4.6,0) -- (4,0);
+			\draw [fill=blue!50!white] (4,-1) -- (5.1,-1) -- (5.6,-2.5) -- (4,-2.5) -- (4,-1);
+			\draw [fill, thick] (5,-4) circle (0.6cm);
+			\draw [fill=blue!70!white, thick] (5,-4) circle (0.3cm);
+			\draw [fill, thick] (0,-4) circle (0.6cm);
+			\draw [fill=blue!70!white, thick] (0,-4) circle (0.3cm);
+		},
+	}
+	\begin{tikzpicture}
+		\node at (3.5,9.5) {\textcolor{black}{\fontsize{23}{24}\selectfont Sorgente e ricevitore}};
+		\node at (3.5,8.5) {\textcolor{black}{\fontsize{23}{24}\selectfont fermi}};
+		\draw [color=blue!50!white, ultra thick] (4.2,0.6) circle (4cm);
+		\draw [color=blue!50!white, ultra thick, dashed] (4.2,0.6) circle (5cm);
+		\draw [color=blue!50!white, ultra thick] (4.2,0.6) circle (6cm);
+		\draw [color=blue!50!white, ultra thick, dashed] (4.2,0.6) circle (7cm);
+		\pic at (0,0) {ambulance};
+		\begin{axis}[axis line style={draw=none}, tick style={draw=none}, yticklabels=\empty, xticklabels=\empty, xshift=6.65cm, yshift=-4cm, scale=0.8]%
+			\addplot[domain=-1:3,samples=50,smooth,ultra thick,gray] {cos(deg((pi+0.3)*x))};
+		\end{axis}
+		\pic at (13,-2.5) {human};
+		%
+		\begin{scope}[shift={(20,0)}]
+			\node at (3.5,9.5) {\textcolor{black}{\fontsize{23}{24}\selectfont Sorgente in movimento}};
+			\node at (3.5,8.5) {\textcolor{black}{\fontsize{23}{24}\selectfont ricevitore fermo}};
+			\draw [color=blue!50!white, ultra thick] (4.2,0.6) circle (4cm);
+			\draw [color=blue!50!white, ultra thick, dashed] (3.7,0.6) circle (5cm);
+			\draw [color=blue!50!white, ultra thick] (3.2,0.6) circle (6cm);
+			\draw [color=blue!50!white, ultra thick, dashed] (2.7,0.6) circle (7cm);
+			\pic at (0,0) {ambulance};
+			\begin{axis}[axis line style={draw=none}, tick style={draw=none}, yticklabels=\empty, xticklabels=\empty, xshift=6.65cm, yshift=-4cm, scale=0.8]%
+			\addplot[domain=0:2,samples=50,smooth,ultra thick,blue] {cos(deg((2*pi)*x))};
+			\end{axis}
+			\begin{axis}[axis line style={draw=none}, tick style={draw=none}, yticklabels=\empty, xticklabels=\empty, xshift=-6cm, yshift=-4cm, scale=0.8]%
+			\addplot[domain=0:2,samples=50,smooth,ultra thick,red] {cos(deg((3/2 * pi)*x))};
+			\end{axis}
+			\pic at (13,-2.5) {human};
+		\end{scope}
+		%
+	\end{tikzpicture}
+\end{document}
\ No newline at end of file
diff --git a/physics/pdf/effetto_doppler.pdf b/physics/pdf/effetto_doppler.pdf
new file mode 100644
index 0000000..a0a267e
Binary files /dev/null and b/physics/pdf/effetto_doppler.pdf differ