Define: (i)Spontaneous emission. (ii)Stimulated emission.

Define: (i)Spontaneous emission. (ii)Stimulated emission.
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Answer :

Spontaneous emission: When the electron jumps from higher energy state to lower energy state on its own accord, the emission is known as spontaneous emission. 

Stimulated emission: When the electron jumps from higher energy state to lower energy state by triggering, (supplying external energy) the emission is known as stimulated emission. 
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