From cc6146cc7e259a9b2597331296d6d069fb3cb4d1 Mon Sep 17 00:00:00 2001
From: Eugeniy Mikhailov <evgmik@gmail.com>
Date: Wed, 1 Oct 2014 23:05:54 -0400
Subject: Plankcks constant was wrong, fixed, thanks to Ian

---
 pe-effect.tex | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'pe-effect.tex')

diff --git a/pe-effect.tex b/pe-effect.tex
index 77c30c0..f81d5b7 100644
--- a/pe-effect.tex
+++ b/pe-effect.tex
@@ -188,7 +188,11 @@ leaks off.
 \item
 Use  the table in Fig.~\ref{fig:mercury_spectrum} to find the exact frequencies and wavelengths of the spectral lines you used and plot the measured stopping potential values versus light frequency for measurements of the first and second order lines (can be on same graph).
 
-\item Fit the plots according to $eV_0 = h\nu-\phi$, extracting values for slopes and intercepts. Find the average value for slope and its uncertainty. From the slope, determine  $h$ counting $e=1.6\cdot10^{-19}$~C. Do your measured values agree with the accepted value of  $h=2\pi\cdot 10^{-34}$J$\cdot$s within experimental uncertainty?
+\item Fit the plots according to $eV_0 = h\nu-\phi$, extracting values for
+	slopes and intercepts. Find the average value for slope and its
+	uncertainty. From the slope, determine  $h$ counting
+	$e=1.6\cdot10^{-19}$~C. Do your measured values agree with the
+	accepted value of  $h=6.62606957(29) \times 10^{-34}$J$\cdot$s within experimental uncertainty?
 
 \item From the intercepts, find the average value and uncertainty of the work function $\phi$. Look up some values of work functions for typical metals. Is it likely that the detector material is a simple metal?
 
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cgit v1.2.3

