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clc;
clear;
h=6.63*10^-34 //Plancks constant in J-s
m=9.1*10^-31 //mass in kg
E=2 //energy in eV
V_0=20 //height of potential barrier in eV
alpha=0.3*10^-9 //width of potental barrier in m
e=1.6*10^-19 //charge in C
//calculation
Gamma=(2*%pi*(sqrt(2*m*(V_0-E)))*e)/h //in m^-1
T=((16*E*(V_0-E)/V_0^2)*exp(-2*(Gamma)*alpha))
mprintf("The tunneling probability is = %1.2e",T)
//The answer provided in the textbook is wrong.
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