HW7

A crystal with an inter-atomic spacing of 0.24 nm (at its plane surface) is used to select gamma-rays (electro-magnetic radiation with very short wavelength) of energy 100 keV from a radioactive source containing a continuum of energies. The incident beam is normal to the surface of the crystal. At what angle do the 100 keV diffracted gamma rays appear?

An electron initially at rest is accelerated across a potential difference of 3 kV. What are its wavelength, momentum, kinetic energy, and total energy?

5 points each