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Agasabsorbsaphotonof300nmandthenre-emittstwophotons.Onephotonhasa wavelength600nm.Thewavelengthofsecond photonis-

  1. Electronsdonotmove    
  2. Electronsmoveemittingradiations    
  3. Energyoftheelectronremainsconstant    
  4. Angular momentum of the electron is h/    

The correct answer is: Energyoftheelectronremainsconstant

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equals 2 square root of left parenthesis s minus a right parenthesis left parenthesis s minus b right parenthesis end root space left parenthesis square root of fraction numerator left parenthesis s minus b right parenthesis over denominator left parenthesis s minus a right parenthesis end fraction end root plus square root of fraction numerator left parenthesis s minus a right parenthesis over denominator left parenthesis s minus b right parenthesis end fraction end root right parenthesis
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equals 2 left parenthesis 2 s minus left parenthesis a plus b right parenthesis right parenthesis
equals 2 left parenthesis 2 s minus 2 s plus c right parenthesis
equals 2 c

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Maths-General
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equals 2 square root of left parenthesis s minus a right parenthesis left parenthesis s minus b right parenthesis end root fraction numerator square root of s minus b end root cross times square root of s minus b end root plus square root of s minus a end root cross times square root of s minus a end root over denominator square root of left parenthesis s minus a right parenthesis left parenthesis s minus b right parenthesis end root end fraction
equals 2 left parenthesis s minus b plus s minus a right parenthesis
equals 2 left parenthesis 2 s minus left parenthesis a plus b right parenthesis right parenthesis
equals 2 left parenthesis 2 s minus 2 s plus c right parenthesis
equals 2 c
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