Recent content by Silly Sausage

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    Dispersion Relation of a De Broglie Wave

    Homework Statement Use the dispersion relation to find the group velocity v_group and phase velocity v_phase. Homework Equations omega(k) = [(hbar)k^2]/2m The Attempt at a Solution v_group = domega(k)/dk = [hbar]k/m = h/m lambda = p/m = v This isn't right. v_phase = omega...
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    KE of Electrons to give same theta as light in double slit diffraction

    done it! thanks guys!
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    KE of Electrons to give same theta as light in double slit diffraction

    OK. I used Ek = p^2/(2m) and h=p lambda to give Ek= h^2/(lambda^2*2m) now do I use n lmbda = dsin theta?
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    KE of Electrons to give same theta as light in double slit diffraction

    Homework Statement Coherent light is passed through two narrow slits whose separation is d. The second-order bright fringe in the interference pattern is located at an angle of theta. If electrons are used instead of light, what must the kinetic energy of the electrons be if they are to...