Atomic lithium of concentration n 3 6 1016 cm 3 is at a temperature T 1500 K In this case the power emitted at the resonant line 's wavelength 671 nm (2P 2S) per unit volume of gas is equal to P 0 30 W cm a Find the mean lifetime of Li atoms in the resonance excitation state ...

The number of excited atoms per unit volume of the gas in 2P state is 8p2xhcAkT ...

Atomic lithium of concentration n = 3.6.1016 cm 3 is at a temperature T = 1500 K.

Question:

Atomic lithium of concentration n = 3.6.1016 cm –3 is at a temperature T = 1500 K. In this case the power emitted at the resonant line's wavelength λ = 671 nm (2P → 2S) per unit volume of gas is equal to P = 0.30 W/cm a. Find the mean lifetime of Li atoms in the resonance excitation state.