Question

had already send over there had already send over there were able let him about how much appreciated learning english got some reason being blocked off tonight after your account registration desk where he said yes sir kindly forgive us​

Answer 1

Answer:

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