Modern physics
ATOMS AND NUCLEI
Alpha-particle scattering experiment;
Rutherford's model of atom;
Bohr model,
energy levels, hydrogen spectrum.
Composition and size of nucleus,
atomic masses,
Mass-energy relation, mass defect;
binding energy per nucleon and its variation with mass number,
nuclear fission, and fusion.
,History of Atoms
800BC 600BC :
· Indian Philosopher Maharishi Kanada
Matter is made up of Parmany or any
370 BC :
I Greek Philosopher Democritus 460 BC
Everything is made up of atoms -
uncuttable
Atoms comes from Greek word
atomos meaning indivisible
1 Greek Philosopher Aristotle 384 BC 322 BC : -
Matter comprises Five elements
earth , water , Fire air and space
,
, I British Chemist John Dalton 1803 :
Atoms are indivisible
Each element has unique atoms
combine in Fixed ratios Form
to compounds
They
Atoms are conserved in chemical reactions
.
British Physicist J . Thomson 1897 ·
J
1 .
-
Cathode Ray Tube Experiment
Discovery of electron
ratio 10
Discovered charge to mass :
E = 1 75
.
x
KE
Millikian Oil drop experiment (1909) : Charge of electron = 1 6
. x 10 9 C
Plum pudding model (1904) OR Watermelon Model
of
Atom Consist
of uniform Sphere
+ Ve charge with
it.
-
Ye electrons embedded in
, I Ernest Rutherford (1911) :
Discovery of alpha particles and B particles (1899)
& particle gold Foil experiment
-
Planetary model of atom
:
Discovery of Protons :
1 Niel Bohr Model (1913) : -
James Chadwick :
Discovery of Neutrons (1932)
· Erwin Schrdinger : Quantum Mechanical Model (1920s) : -
.
simple to
Understand
ATOMS AND NUCLEI
Alpha-particle scattering experiment;
Rutherford's model of atom;
Bohr model,
energy levels, hydrogen spectrum.
Composition and size of nucleus,
atomic masses,
Mass-energy relation, mass defect;
binding energy per nucleon and its variation with mass number,
nuclear fission, and fusion.
,History of Atoms
800BC 600BC :
· Indian Philosopher Maharishi Kanada
Matter is made up of Parmany or any
370 BC :
I Greek Philosopher Democritus 460 BC
Everything is made up of atoms -
uncuttable
Atoms comes from Greek word
atomos meaning indivisible
1 Greek Philosopher Aristotle 384 BC 322 BC : -
Matter comprises Five elements
earth , water , Fire air and space
,
, I British Chemist John Dalton 1803 :
Atoms are indivisible
Each element has unique atoms
combine in Fixed ratios Form
to compounds
They
Atoms are conserved in chemical reactions
.
British Physicist J . Thomson 1897 ·
J
1 .
-
Cathode Ray Tube Experiment
Discovery of electron
ratio 10
Discovered charge to mass :
E = 1 75
.
x
KE
Millikian Oil drop experiment (1909) : Charge of electron = 1 6
. x 10 9 C
Plum pudding model (1904) OR Watermelon Model
of
Atom Consist
of uniform Sphere
+ Ve charge with
it.
-
Ye electrons embedded in
, I Ernest Rutherford (1911) :
Discovery of alpha particles and B particles (1899)
& particle gold Foil experiment
-
Planetary model of atom
:
Discovery of Protons :
1 Niel Bohr Model (1913) : -
James Chadwick :
Discovery of Neutrons (1932)
· Erwin Schrdinger : Quantum Mechanical Model (1920s) : -
.
simple to
Understand
