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Question

A gas absorbs a photon of 335 nm and emits radiations of two wavelengths. If one of the radiations is at 680 nm, then the other is at:
 
  1. 1035 nm
  2. 325 nm
  3. 743 nm
  4. 518 nm


Solution

The correct option is C 743 nm
Energy of the absorbed photon = Sum of the enrgies of the emitted photons
hcλ=hcλ1+hcλ21λ=1λ1+1λ21355×109=1680×109+1λ2
λ2=11.346×106=742.76×109m=743 nm(Approx)

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