From 7847c3830d71a784971a742553ef47a9025d57f4 Mon Sep 17 00:00:00 2001
From: Andrew Lorimer <andrew@lorimer.id.au>
Date: Sat, 20 Oct 2018 14:56:35 +1100
Subject: [PATCH] more additions to cheatsheet from nht exam

---
 physics/final.tex | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/physics/final.tex b/physics/final.tex
index 64240ea..b37f67c 100644
--- a/physics/final.tex
+++ b/physics/final.tex
@@ -81,6 +81,8 @@
 
     $T-mg = {{mv^2} \over r}$ at lowest point
 
+    $E_K_{\text{bottom}}=E_K_{\text{top}}+mgh$
+
 % -----------------------
   \subsection*{Projectile motion}
     \begin{itemize}
@@ -310,6 +312,8 @@
     \[W={1\over2}mv^2=qV \tag{field or points}\]
     \[v=\sqrt{{2qV} \over {m}}\tag{velocity of particle}\]
 
+    Circular path: $F\perp B \perp v$
+
 % -----------------------
   \subsection*{Power transmission}
 
@@ -409,7 +413,7 @@
   % -----------------------
   \subsection*{Polarisation}
   \includegraphics[height=3.5cm]{graphics/polarisation.png} \\
-  Reduces total amplitude
+  Reduces total amplitude (transverse only)
 
   % -----------------------
   \subsection*{Diffraction}
@@ -433,7 +437,7 @@
   \subsection*{Refraction}
   \includegraphics[height=3.5cm]{graphics/refraction.png}
 
-  When a medium changes character, energy is \emph{reflected}, \emph{absorbed}, and \emph{transmitted}
+  When a medium changes character, light is \emph{reflected}, \emph{absorbed}, and \emph{transmitted}
 
   angle of incidence $\theta_i =$ angle of reflection $\theta_r$
 
@@ -445,6 +449,8 @@
 
   $n_1 v_1 = n_2 v_2$
 
+  $n={c \over v}$
+
 
 % +++++++++++++++++++++++
 \section{Light and Matter}
-- 
2.47.1