^Bohr correspondence principle
^Bohr correspondence principle
According to this principle the quantum theory must give same result as classical theory in the appropriate classical limit.
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^Limitations of Bohr’s theory
^Limitations of Bohr’s theory
- It is valid only for single electron system.
- Nucleus was taken as stationary but it also rotates about its own axis.
- Couldn’t explain fine structure of spectral line.
- Provides no information about the relative intensities of spectral lines.
- Provides no distribution of electrons in an atom.
- Fails to explain that why do the electrons move only in circular orbits.
- Bohr’s theory doesn’t explain the Zeeman effect (splitting up of spectral lines in magnetic field) & Stark effect (splitting up of spectral lines in electric field).
- Bohr’s theory doesn’t explain the doublets in the spectrum of the some atoms e.g. in sodium (5890 A0 & 5896 A0).
- Silent about the selection rules which governs the transitions.
- Use two theories
(i) Quantum (to explain the existence of stationary orbits) &
(ii) Classical (for motion of electrons in the orbits). These two theories essentially oppose each other.
^Examples of Newton’s third law
^Examples of Newton’s third law
- A fireman has to hold the pipe strongly to prevent it form going backward as the water flowing out of the pipe pushes it backwards.
- No action can occur in the absence of a reaction. e.g. in a tug-of-war, one team can pull the rope only if the
other team is pulling the other end of the rope. No force can be exerted if the other end is free. One team exerts the force of action and the other team provides the force of reaction.
- The birds push down on the air with their wings, the air pushes their wings up and gives them lift against the weight.
^Spectrum of hydrogen atom
^Spectrum of hydrogen atom
^Rydberg’s formula
^Rydberg’s formula
Let ‘E’ be the energy & λ be the wavelength of the photon released when an electron jumps from a higher quantum state of principal quantum number n2 to a lower quantum state having principal quantum number n1, then
Note Rydberg’s constant depends on mass of
Electron, thus it is not a universal constant.
In deriving the above value the nucleus is assumed to be at rest. However if nucleus is not assumed stationary then the Rydberg constant depends on both mass of electron & nucleus & is given by
^Bohr’s frequency condition
^Bohr’s frequency condition
Energy is emitted only when an electron exited to the higher states jumps back to lower states. The energy emitted is described by the relation
h f = E1 – E2
Ionization energy = +13.6 eV Z2
^Energy level diagram
^Energy level diagram
With the increase in the value of principle quantum number n
(a) r, L, T, U & E all increase while
(b) v, K, & w all decrease.
^Energy in nth orbit
^Energy in nth orbit
Here the -ve sign of energy shows that electron is bound to the nucleus & is not free.
The binding energy of the electron in the ground state of the H-atom is called Rydberg. i.e.
1Rydberg = 13.6 eV
^Magnetic moment generated
^Magnetic moment generated
^Current generated
^Current generated
