From b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b Mon Sep 17 00:00:00 2001
From: priyanka
Date: Wed, 24 Jun 2015 15:03:17 +0530
Subject: initial commit / add all books

---
 2825/CH2/EX2.7/Ex2_7.sce | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100755 2825/CH2/EX2.7/Ex2_7.sce

(limited to '2825/CH2/EX2.7/Ex2_7.sce')

diff --git a/2825/CH2/EX2.7/Ex2_7.sce b/2825/CH2/EX2.7/Ex2_7.sce
new file mode 100755
index 000000000..d435aa62a
--- /dev/null
+++ b/2825/CH2/EX2.7/Ex2_7.sce
@@ -0,0 +1,17 @@
+//Ex2_7 Pg-88
+clc
+disp("Relaxation time in terms of mobility is given by")
+disp("        t=m*u/e")
+printf("\n\n Taking effective mass of electron an holes in consideration,\n relaxation time is given by \n")
+disp("        t=m_star*u/e")
+disp("(a) foe electrons,m_star = 0.259*m_0")
+m0=9.1*10^(-31) 
+ue=0.135 //mobility of electrons
+e=1.6*10^(-19) //electron charge
+t_e=(0.259*m0*ue)/e
+printf("\n Average relaxation time of eletrons = %.2f*1e-13 secs\n ",t_e*1e13)
+
+uh=0.048 //mobility of holes
+disp("(b) For holes in the valance band,m=0.537*m_0")
+t_h=(0.537*m0*uh)/e
+printf("\n Average relaxation time of eletrons = %.2f*1e-13 secs\n ",t_h*1e13)
-- 
cgit