Atomic Nucleus Assignment | Professional Writing Services
11. The existence of the atomic nucleus was discovered in 1911 by Ernest Rutherford, who properly interpreted some experiments in which a beam of alpha particles was scattered from a metal foil of atoms such as gold.
a) If the alpha particles had a kinetic energy of 7.5 MeV, determine their de Broglie wavelength. (b) Explain whether the wave nature of the incident alpha particles should have been taken into account in interpreting these experiments. The mass of an alpha particle is 4.00 u (atomic mass units), and its distance of closest approach to the nuclear centre in these experiments was about 30 fm. The wave nature of matter was not postulated until more than a decade after these crucial experiments were first performed. Ans. (a) 5.2 fm; (b) no, the de Broglie wavelength is much less than the distance of closest approach
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