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Answer all sections
Answer all sections
V (b) Wavefunction Yv=o is the eigenfunction of a simple harmonic oscillator, corresponding to v = 0. ax2 4-o = N, e Equation Q2.b Use the Hamiltonian, Equation Q3.a, to show that the energy of Yv=o is - h (8 marks) (c) A crystal of KBr was irradiated with ultra-violet radiation. The previously transparent crystal was observed to be coloured. (i) ) Briefly explain this experimental observation. (4 marks) (ii) The coloured, irradiated crystal absorbed light with a peak wavelength of 620 nm. The experiment was then repeated with a NaCl crystal. Predict, explaining your reasoning, if the peak absorption wavelength of the irradiated NaCl crystal increases or decreases, relative to KBr. (4 marks) (d) The acid-catalysed bromination of acetone was observed to occur at a rate almost seven times slower when all of the protons were replaced with deuterium atoms. Explain this experimental observation. (4 marks)
V (b) Wavefunction Yv=o is the eigenfunction of a simple harmonic oscillator, corresponding to v = 0. ax2 4-o = N, e Equation Q2.b Use the Hamiltonian, Equation Q3.a, to show that the energy of Yv=o is - h (8 marks) (c) A crystal of KBr was irradiated with ultra-violet radiation. The previously transparent crystal was observed to be coloured. (i) ) Briefly explain this experimental observation. (4 marks) (ii) The coloured, irradiated crystal absorbed light with a peak wavelength of 620 nm. The experiment was then repeated with a NaCl crystal. Predict, explaining your reasoning, if the peak absorption wavelength of the irradiated NaCl crystal increases or decreases, relative to KBr. (4 marks) (d) The acid-catalysed bromination of acetone was observed to occur at a rate almost seven times slower when all of the protons were replaced with deuterium atoms. Explain this experimental observation. (4 marks)