Question

10. Text problem 2.8. Assume that the electrons in a transmission electron microscope are accelerated through a potential of 80,000 volts. Determine

    1. (a) The electron velocity given by this potential by assuming that the energy the electrons

       gain falling through the potential equals the gain in their kinetic energy.

    2. (b) The effective wavelength of the electrons.

    3. (c) The Bragg angle, if the electrons undergo a first-order reflection from a {100} plane of a

       bcc vanadium crystal. Take the lattice parameter of vanadium as 0.3039 nm. Note. See Appendix D for values of the constants needed in the solution of this problem

Answer 1