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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 43

  • question_answer
    The wavelength of the first spectral line in the Banner series of hydrogen atom is\[6561\text{ }!\overset{o}{\mathop{A}}\,\]. The wavelength (in \[\overset{o}{\mathop{A}}\,\]) of the second spectral line in the Balmer series of singly-ionized helium atom is

    Answer:

    (1215)


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