An atom with two energy levels corresponding to the transition (λo= 1 μm, tsp = 3, ms, δν = 107 hz, lorentzian lineshape) is placed in a resonator of volume v= 100 cm3 and refractive index n = 1. two excite modes (one at center frequency νo and the other at νo+ δν) are excited with 1,000 photons each. (a)determine the probability density pst for stimulation emission. the peak transition cross section is given by σ(ν0)=λ02/2π.(b)estimate the optical intensity (in mw/cm2) of this resonator.

In physics the desire of an object to keep doing what it is doing is termed?

Apositive charge moves in the direction of an electric field. which of the following statements are true? check all that apply. check all that apply. 1.the potential energy associated with the charge decreases. 2. the electric field does positive work on the charge. 3. the electric field does negative work on the charge. 4. the potential energy associated with the charge increases. 5. the electric field does not do any work on the charge. 6. the amount of work done on the charge cannot be determined without additional information.

What component of earth’s atmosphere exists entirely as a result of photosynthesis?