Q1: 3+183+20=206 for this specific moment. Other moments also shows conservation.
Q2: There is no preferred direction for which the photon goes.
Q3: Although most of them emitted at the beginning, there can be a few atoms remaining in its exited states for a long time,so the time is not constant.
Q4: When the photon interact with the excited atom, the atom emits another photon that is in the same direction and same phase as the incoming photon.
Q5: 70 might be a good guess because it varies from 8:12 to 12:8 nearly all the time.
Q6: The odd direction photons are in spontaneous emission originally, but these photons sometimes interact with another exited photon thus causing a stimulated emission of photons.
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