JEE Main & Advanced Physics Question Bank Prism Theory and Dispersion of Light

  • question_answer
    Light from sodium lamp is passed through cold sodium vapours, the spectrum of transmitted light consists of [MP PET 1989; RPMT 2001]

    A)            A line at 5890 Å                   

    B)            A line at 5896 Å

    C)            Sodium doublet lines       

    D)            No spectral features

    Correct Answer: D

    Solution :

               According to Kirchhoff?s law, a substance in unexcited state will absorb these wavelength which it emits in de-excitation.


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