For crystal diffraction experiments (discussed in Section 39.2), wavelengths on the order of 0.20 nm are often

Question:

For crystal diffraction experiments (discussed in Section 39.2), wavelengths on the order of 0.20 nm are often appropriate. Find the energy in electron volts for a particle with this wavelength if the particle is
(a) A photon;
(b) An electron;
(c) An alpha particle (m = 6.64 x 10-27 kg).