De Broglie wavelength of neutrons in thermal equilibrium at temperature T is:

Question

G1 Physics · Accepted Answer

For a thermal neutron, λ = h/√(3mkT). With m ≈ 1.675 × 10⁻²⁷ kg, k = 1.381 × 10⁻²³ J/K, h = 6.626 × 10⁻³⁴ J·s, λ ≈ (30.8/√T) Å. Answer: D.