Recent content by Lasse Jepsen

  1. L

    Help with finding the expectation value of x^2

    There are a few problems when doing this, integration by parts says: $$ \int(u dv) = uv - \int(v du) $$ if i use ## u = x ## and ## v = x e^{-2amx^2 \over \hbar } ## then ## dv/dx = e^{-2amx^2 \over \hbar } + -2amxe^{-2amx^2 \over \hbar } x ## this way ## dv = e^{-2amx^2 \over \hbar } +...
  2. L

    Help with finding the expectation value of x^2

    The question is as follows: A particle of mass m has the wave function psi(x, t) = A * e^( -a ( ( m*x^2 / hbar) +i*t ) ) where A and a are positive real constants. i don't know how to format my stuff on this website, so it may be a bit harder to read. Generally when i write "int" i mean the...
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