What Kinetic Energy Must Each Neutron in a Beam of Neutrons

Multiple Choice

What kinetic energy must each neutron in a beam of neutrons have if each has a wavelength of 0.10 nm? The mass of a neutron is 1.67 × 10^-27 kg.

A) 6.6 × 10^-19 J
B) 1.3 × 10^-20 J
C) 2.6 × 10^-20 J
D) 6.3 × 10^-20 J
E) 7.1 × 10^-20 J