Question

2. Find the ratio of population of the two energy states of a medium in thermal equilibrium the transition between which results in the spontaneous emission of photons of wavelength 694.3 nm. Assume the ambient temperature as 27°C.
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Answer 1

Answer:

If levels 1 and 2 are separated by an energy E

2

−E

1

, such that the corresponding transition frequency falls in the middle of the visible range, calculate the ratio of the populations of two levels in the thermal equilibrium at room temperature.