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diff --git a/1271/CH15/EX15.22/22.txt b/1271/CH15/EX15.22/22.txt
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+
+# PROBLEM 22 # 
+Standard formula used 
+ E = (n^2 * h^2) / (8 * m * L^2)) 
+ p_n = n*h/(2*pi) 
+
+ Order of exited state is 16.
+ Momentum of electron is 1.326216e-23 kg-m/sec. 
+\ No newline at end of file