Decibel scale

Decibel scale, with some intuitive examples.

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% Author: Izaak Neutelings (May 2020)
\documentclass[border=3pt,tikz]{standalone}
\tikzset{>=latex} % for LaTeX arrow head
\usepackage{etoolbox} % ifthen
\usepackage{xcolor}
\usepackage{physics}
\usepackage{siunitx}
\colorlet{myblue}{blue!50!black}
\colorlet{mypurple}{blue!40!red!95!black}
\colorlet{mygreen}{green!70!black!60}
\colorlet{myyellow}{yellow!90!black!60}
\colorlet{myred}{red!80!black!60}
\pgfdeclareverticalshading{rainbow}{100bp}{
  color(0bp)=(red); color(25bp)=(red); color(35bp)=(yellow);
  color(45bp)=(green); color(55bp)=(cyan); color(65bp)=(blue);
  color(75bp)=(violet); color(100bp)=(violet)
}
\begin{document}
% SOUND DECIBEL SCALE
\begin{tikzpicture}[xscale=0.12]
  \def\h{0.68}
  
  \def\tick#1#2#3{\draw[thick,#2] (#1+.09) --++ (0,-.18) node[below=-2pt,scale=1] {\strut #3};}
  
  % COLOR GRADIENT
  \fill[left color=white,right color=mygreen]
    (-7,0) rectangle (10,\h);
  \fill[mygreen] (10,0) rectangle (80,\h);
  \fill[left color=mygreen,right color=myyellow]
    (75,0) rectangle (85,\h);
  \fill[left color=myyellow,right color=myred]
    (85,0) rectangle (125,\h);
  \fill[left color=myred,right color=black!85]
    (125,0) rectangle (140,\h);
  
  % DECIBEL
 
 
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Click to download: wave_decibel_scale.tex • wave_decibel_scale.pdf
Open in Overleaf: wave_decibel_scale.tex