modern physics timeline
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Mode
Phys
Ma. Jennelyn Callope Jesusa Mae Carballo Jhetro Arthur C
A Ride Through
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Modern Physics Defin
Modern physics is the interpretatioextension of physics in light of key
which happened about 1990. The
modern physics is not synonymoucontemporary physics but rather im
viewpoint in contrast with that of pr
classical physics.
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1895
WilhelmConrad
Roentgen
discovers
X-rays
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1897Joseph John
Thomsonmeasures
the charge to
mass ratio of
the electron
e/m = 1.75882 x 108
C/g
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1909Robert
AndrewsMillikan
measures
electron
charge
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Millikan OIL drop EXPERIM
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1898Ernest
Rutherforddiscovers
alpha and
beta
radiation
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1910Ernest
Rutherfordand his team
performs
alpha-
scattering
experiment
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RUTHERFORD SCATTERING EXPER
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1911Ernest
Rutherford
discovers the
nucleus of
the atom
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1919Rutherford and
James Chadwick
observed theproton as a
particle that is
emitted by
bombardment of
certain atoms
with -particles
C
ide
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1932Werner
Heisenberg
proposes thatthe nucleus of
an atom is
composed of
protons and
neutrons
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1901Max Planck
makes hisquantum
hypothesis,
called
Planck's Law
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PHOTOELECTRIC EFFEC
When light of a sufficiently high energy
electrons are knocked off its surface. They
positive electrode and form a current flowing
The important observations follow.
1. Electrons can be ejected only if the ligh
short wavelength (has sufficiently high energ
long or how brightly the light shines. This different for different metals.
2. The current (the number of electrons em
increases with increasing brightness (intensit
current, however, does not depend on the co
long as the wavelength is short enough
energy).
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1905Einstein
postulatesthe
equivalence
of mass and
energy
E = mc2
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1905Einstein
publishes his
Special
Theory of
Relativity
Special Theory of Relativity deals with
things moving near or at the speed of
light (systems that are not
accelerating).
1. The laws of physics are the same inall inertial (=non-accelerating)
reference frames.
2. 2. The speed of light in free space is
constant.
pu
T
General Theory of Relativity deals with
observers in any state of uniform motion
including relative acceleration. Also
known as Theory of Gravitation, it
determined that massive objects cause a
distortion in space-time, which is felt as
gravity.
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1912William
Bragg showsthat X-rays
scatter off
crystal
lattices
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1913Neils Bohr
proposes his
quantum
theory of
atomic orbits
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1923Louis Victor de
Broglieproposes the
particle-wave
duality of the
electron
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1925Max Born and
WernerHeisenberg
introduce
quantum
mechanics
Sdeme
m
1926Werner
Heisenbergdevelops matrix
mechanics, the
first quantum
mechanical
theory
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1927Werner
Heisenberg
publishes his
Uncertainty
Principle
The ex
of an
withinnucleu
time co
know
certaintstat
calculat
prob
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1928Paul Dirac
predicts thediscovery of
the positron
and
antimatter
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1929Edwin Hubble
observes the
redshift ofdistant
galaxies and
concludes that
the Universe is
expanding
The Doppler Redshift results from t
motion of the light emitting objec
observer. If the source of light is moving
you then the wavelength of the light iout, i.e., the light is shifted towards the r
The Cosmological Redshift is a redshift
the expansion of space. The waveleng
increases as it traverses the expandinbetween its point of emission and it
detection by the same amount that
expanded during the crossing time.
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REDSHIFT
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1933Astrophysicist
Fritz Zwicky
infers
existence of
dark matter
Va
th
of
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1935Physicist
Subramahnyan
Chandrasekhar
predicts black
holes
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1938Lise Meitner
and Otto Frischsuccessfully
diagnosed the
occurrence of
nuclear fission
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1942Enrico Fermi
obtains thefirst self
sustaining
fission
reaction
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1953
Murray Gell-Mann lays
foundation
for the quark
V
mo
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NEW MILLENIUM
C
E
RN
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Nuclear Research
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NEW MILLENIUM
Stephen Hawking
Higgs Boson;
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Thank
You