Decibel scale, with some intuitive examples.
% Author: Izaak Neutelings (June 2020)% Inspiration:% https://courses.physics.ucsd.edu/2011/Summer/session1/physics2c/diffraction.pdf% https://tex.stackexchange.com/questions/201830/periodic-shading-in-tikz\documentclass[border=3pt,tikz]{standalone}\usepackage[outline]{contour} % glow around text\usepackage{physics}\usepackage{xcolor}\usepackage{etoolbox} %ifthen\usetikzlibrary{calc}\usetikzlibrary{arrows,arrows.meta}\usetikzlibrary{decorations.markings}\usetikzlibrary{angles,quotes} % for pic (angle labels)\usetikzlibrary{fadings}\tikzset{>=latex} % for LaTeX arrow head\contourlength{1.4pt}\colorlet{wall}{blue!30!black}\colorlet{myblue}{blue!70!black}\colorlet{myred}{red!70!black}\colorlet{mydarkred}{red!50!black}\colorlet{mylightgreen}{green!60!black!70}\colorlet{mygreen}{green!60!black}\colorlet{myredgrey}{red!50!black!80}\colorlet{myshadow}{blue!30!black!90}\tikzstyle{wave}=[myblue,thick]\tikzstyle{mydashed}=[black!70,dashed,thin]\tikzstyle{mymeas}=[{Latex[length=3,width=2]}-{Latex[length=3,width=2]},thin]\tikzstyle{mysmallarr}=[-{Latex[length=3,width=2]}]\newcommand\rightAngle[4]{\pgfmathanglebetweenpoints{\pgfpointanchor{#2}{center}}{\pgfpointanchor{#3}{center}}\coordinate (tmpRA) at ($(#2)+(\pgfmathresult+45:#4)$);\draw[white,line width=0.6] ($(#2)!(tmpRA)!(#1)$) -- (tmpRA) -- ($(#2)!(tmpRA)!(#3)$);\draw[mydarkred] ($(#2)!(tmpRA)!(#1)$) -- (tmpRA) -- ($(#2)!(tmpRA)!(#3)$);}\newcommand\lineend[2]{\def\w{0.1} \def\c{30}\draw[mygreen] (#1)++(#2:\w) to[out=#2-180-\c,in=#2+\c] (#1)to[out=#2+\c-180,in=#2-\c]++ (#2-180:\w);
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