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ElijahRockers
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Homework Statement
Find <x> in terms of X0 if X0 is constant and
[itex]\Psi(x) = \frac{1}{\sqrt{X_0}}e^{\frac{-|x|}{X_0}}[/itex]
and
[itex]<x> = \int^{\infty}_{-\infty}{\Psi^* x \Psi}dx[/itex]
where Psi* is the complex conjugate of Psi.
Since there is no imaginary component, this is effectively Psi2.
so, from here I could do a u-substitution to integrate over e^u du, but I'm not sure how.
What is the derivative of -2|x|/X_0 with respect to x?
This is part of a physics exercise I'm working on.
[itex] <x> = \frac{1}{x_0}\int^{\infty}_{-\infty}e^{\frac{-2|x|}{X_0}} dx[/itex]
I have found that the derivative of |x| depends on whether x<0 or x>0. for x<0, x'=-1 and for x>0, x'=1 but I'm not sure how to tie this all together for the integration.
I guess what I'm really asking is how do I find the integrand here?
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