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John Archibald Wheeler
John Archibald
Wheeler was a renowned theoretical physicist from America who explained the
concept of nuclear fission and fusion. He was instrumental in development of
the first atom bomb during World War II and later was involved in the making of
the hydrogen bomb. After completing his schooling this scientific genius,
associated with the likes of Niels Bohr and Gregory Breit and with the latter
he put forth the ‘Breit-Wheeler process’ to convert light into matter. He then
began his four decade long association with the Princeton University. It was at
Princeton that he developed the concept of S-matrix, which holds good even
today. Owing to his expertise in the process of nuclear fission he was inducted
into Project Manhattan during WWII. He made significant contribution in the
development of nuclear reactor as well as in the purification of Plutonium.
After the WWII he resumed his academic responsibilities and was involved in
various other research work that included theoretical physics. He spearheaded
the revival of theoretical physics and studied the time-space continuum and
strived to establish a geometrical basis for phenomenon like gravity. His
efforts led to the inception of ‘Geometrodynamics’ and he even studied
wormholes and black holes. In fact he was the one to coin the term black hole.
Read on to know more about his life and works
Childhood & Early Life
· On July 9,
1911, John Archibald Wheeler was born to Joseph Lewis Wheeler and Mabel
Archibald Wheeler in the city of Jacksonville, Florida, United States.
· Both his
parents worked as librarians and he had three younger siblings Joseph, Robert
and Mary.
· Wheeler attended
a local school in Vermont where the family resided during 1921-22 and later
studied at the ‘Rayen High School’ in Ohio. He then attended the ‘Baltimore
City College’ from where he graduated in 1926.
· He received a
scholarship to the ‘John Hopkins University’ sponsored by the state of
Maryland. While working at the ‘National Bureau of Standards’ during the summer
of 1930, he released his first scientific paper.
· Under the
tutelage of physicist Karl Herzfeld he worked on his thesis for the doctoral
studies and was awarded a Ph. D. in 1933. His thesis dealt with dispersion and
absorption of the inert gas Helium.
Career
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§ During 1934-35,
he worked in collaboration with physicists Gregory Breit and Niels Bohr. It was
in 1934 that Wheeler in collaboration with Breit discovered the mechanism by
which light can be converted to matter. The process was named after its
founders as the ‘Breit-Wheeler Process’ and marked the beginning of the
latter’s scientific career.
§ He then
embarked on his first teaching assignment at the ‘University of North Carolina
at Chapel Hill’, a public research university. As an assistant professor he was
offered an annual salary of $2300.
§ Owing to his
interest in particle physics, in the year 1938 he accepted the position of an
associate professorship at the ‘Princeton University’. The same year he
collaborated with theoretical physicist Edward Teller to investigate the liquid
drop model of atomic nucleus.
§ In 1939,
following the discovery of nuclear fission Archibald collaborated with Niels Bohr
and the duo set about examining the phenomenon of fission in Uranium, in order
to elucidate the process. They concluded that it was the unstable isotopes of
fissionable materials that released the energy upon being bombarded by
neutrons.
§ Wheeler was inducted
into the ‘Manhattan Project’ in 1942 and he was a part of the ‘Metallurgical
Laboratory’ that was in charge of developing the nuclear reactor. The findings
of the research he undertook, with Robert F. Christy another theoretical
physicist, were published in a paper ‘Chain Reaction of Pure Fissionable
Materials in Solution’.
§ He was then
incorporated into the design department of ‘DuPont’, the chemical manufacture
company, which was in charge of constructing the nuclear reactor as well a
facility for purification of Plutonium.
§ During 1943-44,
he worked in close association with the engineers and even had to relocate a
few times. He even pointed out a technical snag in the design of the reactor,
which caused it to shut down.
§ In 1945, he
recommenced teaching at Princeton and he embarked on research of elementary
particles in particular the ‘muon’ and in association with Brazilian physicist
Jayme Tiomno, explored the decay of radioactive substances and dubbed their
findings as the ‘Tiomno Triangle’.
§ He was then
appointed as the director of ‘Cosmic Rays Laboratory’ established in Princeton
in 1948.
§ Wheeler was
then engaged at the ‘Los Alamos Laboratory’ which undertook the assignment to
develop the Hydrogen Bomb. It was in 1951 that he established a division of the
‘Los Alamos Labs’ at Princeton through which he engaged students in projects
involving nuclear weapons and nuclear energy as an alternative.
§ Wheeler’s
efforts bore fruits in 1953, when the ‘Matterhorn B’, a wing of ‘Project
Matterhorn’ initiated by him in Princeton, successfully detonated the first
thermonuclear device powered by nuclear fusion.
§ Continuing his
academic profession at Princeton, this eminent theoretical physicist began to
study electromagnetism and gravitational force. He coined the term ‘geon’ to
describe a wave, be it gravitational or electromagnetic in nature, that is
confined in the field propagated by its own force of attraction.
§ He was also
instrumental in reviving the branch of physics that dealt with Einstien’s
general relativity. He described the passages in the space-time continuum as
mentioned in Einstien’s theory as ‘wormholes’ and inferred by further
investigation that they are unstable.
§ He pioneered
‘Geometrodynamics’, which strives to analyze the geometrical basis of all space-time
phenomena, with its ultimate goal being the establishment of a unified field
theory.
§ From 1962-73,
he published many books which accounted the details of his research.
‘Geometrodynamics’, ‘Spacetime Physics’, ‘Scouting Black Holes’ and ‘Gravitation’
are some of the works he penned during this time.
§ In 1967, he
coined the term ‘black holes’ to explain the phenomenon of gravitational
collapse.
§ After a career
spanning nearly four decades in Princeton, he retired in 1976.
§ From 1976-1986,
he remained at the ‘Center for Theoretical Physics’ affiliated to the
‘University of Texas’. During his tenure he was involved with experiments that
dealt with quantum physics.
Major Works
§ John Archibald
was renowned for making numerous contributions to the field of science but his
work in the field of nuclear fission and fusion reaction is of paramount
significance. He was involved in the making of first ever atom bomb and later
the Hydrogen bomb.
Awards & Achievements
§ Throughout his
career John was lauded with several honours and awards which include the
‘Albert Einstien Award’, ‘Enrico Fermi Award’ and ‘Franklin Medal’.
§ In 1970 he was
presented with the ‘National Medal of Science’ by the President of United
States.
§ In 2003, he was
awarded the ‘Einstein Prize’ by the ‘American Physical Society’ for his
contribution in the field of gravitational physics.
Personal Life & Legacy
§ Wheeler got
married to Janette Hegner on June 10, 1935 after courting her for two years.
Janette was a student of history at the ‘John Hopkins University’ and later
took up teaching position at ‘Rye Country Day School’. The couple have three
children.
§ This eminent
scientist breathed his last on April 13, 2008 in New Jersey, six months after
his wife’s demise. He was suffering from pneumonia and was aged 96 at the time
of his death.
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