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V(X) = 0 ( x < 0 )

= V0 ( 0 < x < a )

= 0 ( x> a )

Psi(x)1 = Aexp[ik1x] + B exp[-ik1x]

Psi(x)2 = Cexp[ik2x] + D exp[-ik2x]

Psi(x)3 = Fexp[ik1x] + G exp[-ik1x] ( K3= K1 so I put k1 )

and G = 0 because there is no reflection,

I used B.C so I get 4 functions

and I calculated and I found what is A/F .

but there is problem

exp[ik2a] and exp[-ik2a], I changed into sine and cosine

but there is remaind exp[ik1a]

I have to derive T(transmission) but there is no K1

how do I eliminate that?

this problem is from Introductory Nuclear Physics chap.2 - 1

please help me :(