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State two points of differentiation between spontaneous emission and stimulated emission.

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Spontaneous emission
Stimulated emission
Excited atoms comes to ground state on its own accord
Excited atoms comes to ground state after interaction with incident photon
Radiations are in random direction , phase and wavelength 
Radiations are coherent , monochromatic and in same direction.
Independent of outside circumstances
Dependent of outside circumstances
No metastable state exist ( ordinary exited state) 
Metastable state exist
Number of photons emitted are less 
Number of photons emitted are more

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