Question: ( 4 ) Answer the following: - What are the characteristics of stimulated radiation? What causes radration to have a degree of coherence? What is

(4) Answer the following:-
What are the characteristics of stimulated radiation?
What causes radration to have a degree of coherence?
What is the meaning "Laserwavelength refers to the output wave length of d laser "?
What is the difference between higer energy state and excited energy state.
What is the absorption condition?
How long does it take to remain in the excited state?
( 4 ) Answer the following: - What are the

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