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(a) The Bohr atom is a simple model for hydrogenic atomic systems. 0 State which two forces are balanced in order to generate stable orbits in the Bohr atom model. (2 marks) ) The third series of lines in the atomic spectrum of hydrogen are observed to converge on a limit of 820 nm. Calculate both the frequency and wavenumber of this line. (4 marks) (1) The first five lines of the third series of lines found in the atomic spectrum of hydrogen are presented in Table Q1. Use this data, and the wavelength of the limit in Q1.b.(i), to draw a graph and calculate the Rydberg constant in cm- (7 marks) Table Q1 line 1 2 3 4 5 Wavelength/ nm 1875 1282 1094 1005 955 (b) For both wavefunctions, I and II, shown in Figure Q1, explain if they are valid wavefunctions and, if so, sketch their corresponding probability distribution functions. FIGURE Q1 hr ਮ (6 marks)