Structure Of Atom

  • Question
    CBSEENCH11008092

    A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emission is at 680 nm, the other is at

    • 1035 nm

    • 325 nm

    • 743 nm 

    • 518 nm

    Solution

    C.

    743 nm 

    E = E1 + E2
    hc over straight lambda space equals space hc over straight lambda subscript 1 space plus hc over straight lambda subscript 2
1 over straight lambda space equals space 1 over straight lambda subscript 1 space plus 1 over straight lambda subscript 2
1 over 355 space equals space 1 over 680 space plus 1 over straight lambda subscript 2
straight lambda subscript 2 space equals space 742.76 space nm

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