rite the main points of Bohr’s model of an atom. How did it explain (i) the stability of an atom (ii) origin of spectral lines in hydrogen atom? [3+2]
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Explanation:
The Bohr's postulates -
1) An electron can revolve around the nucleus in certain fixed orbits of definite energy without emission of any radiant energy. Such orbits are called stationary orbits.
2) An electron can make a transition from a stationary state of higher energy
E
2
to a state of lower energy
E
1
and in doing so, it emits a single photon of frequency,
ν
=
E
2
−
E
1
h
where
h
is the Planck's constant.
Conversely, on absorbing an energy,
E
2
−
E
1
when the electron is at energy
E
1
, the electron can make a transition from
E
1
to
E
2
.
3) Only those orbits are allowed for which the angular momentum of the electron is an integral multiple of
h
2
π
,
Thus,
L
=
n
h
2
π
where
n
=
0
,
1
,
2
,
...
.
.
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