Flashcards for JEE Physics - Atoms Class 12

 Page 1


Atoms
Flash cards
Page 2


Atoms
Flash cards
Bohr's model is an atomic model
which is able to solve the puzzle of hydrogen spectra and hence to remove 
difficulties with Rutherford's model. This model is based on the law of conservation 
of angular momentum.
Page 3


Atoms
Flash cards
Bohr's model is an atomic model
which is able to solve the puzzle of hydrogen spectra and hence to remove 
difficulties with Rutherford's model. This model is based on the law of conservation 
of angular momentum.
Bohr’s Postulate 1
The electron revolves round the nucleus in circular orbits. The coulomb force 
provides the essential centripetal force to keep it revolving in circular orbit.
Page 4


Atoms
Flash cards
Bohr's model is an atomic model
which is able to solve the puzzle of hydrogen spectra and hence to remove 
difficulties with Rutherford's model. This model is based on the law of conservation 
of angular momentum.
Bohr’s Postulate 1
The electron revolves round the nucleus in circular orbits. The coulomb force 
provides the essential centripetal force to keep it revolving in circular orbit.
Bohr’s Postulate 2
The electron can revolve around the nucleus in some permitted orbits only. These 
orbits are known as stationary orbits or fixed orbits or Maxwell's licensed orbits. In 
these orbits of special radii, the electron does not radiate any energy.
Page 5


Atoms
Flash cards
Bohr's model is an atomic model
which is able to solve the puzzle of hydrogen spectra and hence to remove 
difficulties with Rutherford's model. This model is based on the law of conservation 
of angular momentum.
Bohr’s Postulate 1
The electron revolves round the nucleus in circular orbits. The coulomb force 
provides the essential centripetal force to keep it revolving in circular orbit.
Bohr’s Postulate 2
The electron can revolve around the nucleus in some permitted orbits only. These 
orbits are known as stationary orbits or fixed orbits or Maxwell's licensed orbits. In 
these orbits of special radii, the electron does not radiate any energy.
Bohr’s Postulate 3 (continued)
If the electron jumps from an orbit of higher energy, E
2
to an orbit of lower energy, 
E
1
; It emits a photon of radiation. On the other hand, the electron can jump from an 
orbit of lower energy, E
1
to an orbit of higher energy, E
2
by absorbing energy from 
some out side source