2. (a) Describe how absorption, spontaneous emission and stimulated emission can each result in a transition between two

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2 A Describe How Absorption Spontaneous Emission And Stimulated Emission Can Each Result In A Transition Between Two 1 (72.24 KiB) Viewed 71 times

2. (a) Describe how absorption, spontaneous emission and stimulated emission can each result in a transition between two separate energy levels. Your answer should clearly explain the difference between each process. (b) At what temperature will the rate of spontaneous and stimulated emission be equal for a transition with a wavelength of 632.8 nm? You should assume that the system is in thermal equilbrium. Hint: The spectral energy density can be written as U,(T) 87hv3 1 c3 ehv/kT - 1