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Interpretation:
‘change of energy’ should be identified.
Concept introduction:
From the Bohr postulates the radius of an orbit and its energy can be determined but to explain the atomic spectra the orbital concept have to introduce. The energy gap between the successive orbitals can be determined from the energy expression and the corresponding energy needed to excite an electron from a particular orbital to other orbital give rise the wave numbers which is associated with some particular spectrum. In the figure it is shown n = 1 to infinity.
The electron jumps from n=1 to n=2 is called the 1st excitation and n=2 to n=3 is 2nd excitation and like that. It is seen that as the number of n increases the energy gap between the successive orbitals decreases. The energy required to jump one electron from n=1 to n= infinity is called the ionisation energy of the atom.
Given:
In the
Where r = radius of the orbit, Z is the charge of the nucleus and
Bohr also concluded the energy level E of an electron in a given orbit is
To determine:
The difference of energy i.e.
The relation of the derived equation with the Balmer-Rydberg equation.
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Chapter 5 Solutions
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