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zhillyz
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Homework Statement
A wave function is given by:
[itex] \Psi (x) = a cos(2\pi x) + b sin (2\pi x) for\: x<0 \\
and\\
\Psi (x) = Ce^{-kx} for\: x>0 \\[/itex]
Determine the constant k in terms of a, b and c using the boundary conditions and discuss the case a >> b.
Homework Equations
Wavefunctions and their first order derivatives are continuous at the boundaries. So at x = 0 they will equal each other.
The Attempt at a Solution
[itex] acos (2\pi x) + b sin(2\pi x) = Ce^{-kx}[/itex]
sin 0 = 0 and cos 0 = 1 and exp 0 = 1 therefore;
[itex] a = C \\
-(2\pi x)asin(2\pi x) + (2\pi x)bcos(2\pi x) = -ake^{-kx}[/itex]
again sin 0 = 0 cos 0 = 1 exp 0 = 1 and x = 0 therefore;
[itex] -ak = 0[/itex]
Soo pretty sure this is correct so far but not sure on the final step?