In a hydrogen atom,if 9 , eV of energy is sup | vedclass

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(A) The energy levels of a hydrogen atom are given by $E_n = -13.6 / n^2 \, eV$. For $n=1$,$E_1 = -13.6 \, eV$. For $n=2$,$E_2 = -3.4 \, eV$. The ener

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$0$

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(A) The energy levels of a hydrogen atom are given by $E_n = -13.6 / n^2 \, eV$. For $n=1$,$E_1 = -13.6 \, eV$. For $n=2$,$E_2 = -3.4 \, eV$. The energy required to excite an electron from $n=1$ to $n=2$ is $\Delta E = E_2 - E_1 = -3.4 - (-13.6) = 10.2 \, eV$. Since the supplied energy is $9 \, eV$,which is less than the excitation energy of $10.2 \, eV$,the electron cannot be excited to any higher energy level. Therefore,no spectral lines will be emitted. The correct option is $A$.

In a hydrogen atom,if $9 \, eV$ of energy is supplied,how many spectral lines will be emitted?

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