Question

40. Large neutron-scattering facilities have been established to study the structure of materials since one of their advantages is that their wavelengths can be as small as the distance between atoms. For thermal (25° C) neutrons of energy 40 meV, calculate their de Broglie wavelength. A. 4.8 × 10–10 nm B. 0.20 nm C. 0.14 nm D. 4.8 × 10–10 nm E. 2.0 nm

Answer 1

Mass of neutron m= 1.67 x 10^-27 kg

Given energy K = 40 meV = 40 x 10^-3 eV

The De-Broglie wavelength is given as: