(b) What is the de Broglie wavelength (in m) of a neutron moving at a speed of 2.49 ✕ 108 m/s?   Note that the neutron is moving very close to the speed of light in this case. Therefore, we cannot use the non-relativistic approximation for momentum. What is the relativistic relationship between momentum and speed? What is the gamma factor? m       (1.59E-15 is not the correct answer)

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