When I open the door,tricky trotted out and was immediately engulfed by joe,the greyhound,and his friends.after rolling him over and thoroughly inspecting him,the dogs moved off down the garden,tricky followed them,rolling slightly with his surplus fat.
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Necessary conditions for the laser action is - Option 1: the rate of stimulated emission must be higher than the rate of spontaneous emission Option 2: the rate of stimulated emission must be lower than the rate of spontaneous emission Option 3: the rate of stimulated emission must be lower than the rate of absorption Option 4: the rate of stimulated emission must be equal to the rate of spontaneous emission
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