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 where E 3= -13.6/3*3 = -1.5 eV 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
40) A 12.5 eV electron beam is used to bombard gaseous hydrogen at room temperature. What series of wavelengths will be emitted?
Answer is:
Lyman series: 103 nm and 122 nm; Balmer series: 656 nm.
Explanation:
Related Atoms and Nuclei MCQ with Answers
Answer is:
about the same as predicted by Rutherford's model
Answer is:
much less than predicted by Rutherford's model
Answer is:
scattering is predominantly due to a single collision
Explanation:
It is found experimentally that for small thickness t, the number of ?-particles scattered at moderate angles is proportional to t. scattering is predominantly due to a single collision does this linear dependence on t provide?
Answer is:
Thomson's model
Explanation:
In Thomson model is it completely wrong to ignore multiple scattering for the calculation of average angle of scattering of???-particles by a thin foil