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2. Bohr's Quantum Model of the Atom (a) (2 marks) Use the expression 112 an Z to calculate the radii of the rst, second and

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2. Bohr's Quantum Model of the Atom (a) (2 marks) Use the expression 112 an Z to calculate the radii of the rst, second and third Bohr orbits of hydrogen. (1)) (2 marks} Find the electron's speed in the same three orbits. (c) (2 marks) Is a relativistic correction necessary? Explain. r\

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