What will be the number be the number of total no. of spectral lines obtained when a electron of $H -$ atom jumps from its fifth excited state to its ground state?

10

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15

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21

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6

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Solution

The correct option is C $21$
Fifth excited state means 6th orbit
Number of spectral lines produced if electron jumps from $n^{t h}$ state to ground state = $Σ n$
So $Σ 6 = 6 + 5 + 4 + 3 + 2 + 1 = 21$ spectral lines are produced.

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What will be the number be the number of total no. of spectral lines obtained when a electron of H−atom jumps from its fifth excited state to its ground state?

The correct option is C 21Fifth excited state means 6th orbitNumber of spectral lines produced if electron jumps from nth state to ground state = ΣnSo Σ6=6+5+4+3+2+1=21 spectral lines are produced.

What will be the number be the number of total no. of spectral lines obtained when a electron of $H -$ atom jumps from its fifth excited state to its ground state?

The correct option is C $21$
Fifth excited state means 6th orbit
Number of spectral lines produced if electron jumps from $n^{t h}$ state to ground state = $Σ n$
So $Σ 6 = 6 + 5 + 4 + 3 + 2 + 1 = 21$ spectral lines are produced.