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Question
A sample of H-atoms containing all the atoms in some excited state is irradiated with light of wavelength λ and the atoms get re-excited to further higher orbit. On removing the light source, atoms de-excite to ground state with emission of radiations. The emission spectrum thus obtained consists of ten spectral lines corresponding to ten different wavelengths. Out of the ten spectral lines, seven lines have the wavelength smaller than the incident \lambda, while only two of them have wavelengths longer than the incident wavelength. The orbit number in which electrons were present initially is:
A sample of H-atoms containing all the atoms in some excited state is irradiated with light of wavelength λ and the atoms get re-excited to further higher orbit. On removing the light source, atoms de-excite to ground state with emission of radiations. The emission spectrum thus obtained consists of ten spectral lines corresponding to ten different wavelengths. Out of the ten spectral lines, seven lines have the wavelength smaller than the incident \lambda, while only two of them have wavelengths longer than the incident wavelength. The orbit number in which electrons were present initially is:
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Solution
The correct option is A 3
The electrons were initially present in third orbital and they were excited to higher level by absorption of radiation. In the emission spectrum, two lines corresponding to transitions have higher wavelengths than the light used for the absorption. Other lines have longer wavelengths.
The electrons were initially present in third orbital and they were excited to higher level by absorption of radiation. In the emission spectrum, two lines corresponding to transitions have higher wavelengths than the light used for the absorption. Other lines have longer wavelengths.
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