Consider a Beam of Free Particles That Each Have a Certain

Multiple Choice

Consider a beam of free particles that each have a certain (nonrelativistic) kinetic energy $K$ . If we double this kinetic energy, what happens to the beam's wavelength?

A) It increases by a factor of 2 .
B) It increases by a factor of $2^{1 / 2}$ .
C) It remains the same.
D) It decreases by a factor of $2^{1 / 2}$ .
E) It decreases by a factor of 2.