Physics, 26.11.2019 17:31 eylinglez3ovm16v
The laser transition in neon at 6328 å is doppler broadened by the thermal motion of the atoms at a gas temperature of ~300oc (assume pure ne20). (volume = 1 cm3.) (a) what is the full width at half maximum of the transition? (ans. 1.81 ghz.) (b) suppose that a he: ne laser tube is placed inside a cavity 1 m long. how many temo. o.q modes are within ±δv/2 of the line center? (ans. 12.) (c) the energy of the upper state, 3 s2, is 166,658.484 cm-1 above the ground state. express the upper-and lower-state energies in ev. what is the quantum efficiency of this laser? (d) find the stimulated emission cross section given that a21 = 6.56 x 107 sec-1. (e) if the density of excited neon atoms in state i (j1 = 2) is 1010 cm-3, how many excited atoms in state 2 (j2 = 1) are required to establish a small-signal gain coefficient of 5%/m?
Answers: 3
Physics, 22.06.2019 05:00
Which statements describe the movement of ocean currents around the globe? check all that apply. strong winds force warm water to sink to the ocean floor. the coriolis effect causes warm and cold water to mix. cool dense water sinks to the ocean floor. warm water replaces cool surface water. wind blowing parallel to the shore causes upwelling of cool water.
Answers: 1
Physics, 22.06.2019 05:30
Agas expands from an initial volume of 0.040 m^3 and an initial pressure of 210 kpa to a final volume of 0.065 m^3 while its temperature is kept constant. how much work is done by the system?
Answers: 1
Physics, 22.06.2019 15:10
When electrons are added to the outermost shell of a carbon atom, it forms--an anion that has a larger anion that has a smaller cation that has a larger cation that has a smaller radius.
Answers: 3
The laser transition in neon at 6328 å is doppler broadened by the thermal motion of the atoms at a...
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