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The number of spectral lines obtain in Bohr spectrum of hydrogen atom when an electron is excited from ground level to 5th orbit is

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The number of spectral lines obtain in Bohr spectrum of hydrogen atom when an electron is excited from ground level to 5th orbit is
A. 5
B. 10
C. 20
D. 1
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1 Answer

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Correct Answer - B
Number of spectral lines `=(n(n-1))/(2)`
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