AP Physics 2
15.1 Quantum Theory and Wave-Particle Duality
A container holds a mixture of thermal neutrons and helium-4 gas in thermal equilibrium at an absolute temperature \(T\). The mass of a helium-4 atom is approximately four times the mass of a neutron (\(m_{\text{He}} \approx 4m_n\)). What is the ratio \(\dfrac{\lambda_n}{\lambda_{\text{He}}}\) of the average de Broglie wavelength of a neutron to that of a helium-4 atom?
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