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CBSE Class 12-science Answered

A 12.5 eV electron beam is used to bombard gaseous hydrogen at room temperature.What series of wavelengths will be emitted?
Asked by sumitchauhansc20 | 04 Mar, 2015, 06:34: PM
answered-by-expert Expert Answer

Hi Sumit,

In ground state, energy of gaseous hydrogen at room tempertaure= - 13.6 eV. When bombarded with 12.5 eV electron beam, the energy becomes, -13.6 +12.5 = -1.1 eV

i.e. electron would jump from n=1 to n=3 wherebegin mathsize 12px style space straight E subscript 3 space equals space fraction numerator negative 13.6 space over denominator 3 squared end fraction equals space minus 1.5 space eV end style

On de-excitation the electron may jump from either n=3 to n=2 givind rise to Balmer series

It may also jump from n = 3 to n =1 , giving rise to Lyman series.

Answered by | 04 Mar, 2015, 06:44: PM

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