Einstein, Albert
(1879–1955). Any list of the greatest thinkers in history will contain the name of the brilliant physicist Albert Einstein. His theories of relativity led to entirely new ways of thinking about time, space, matter, energy, and gravity. Einstein's
work led to such scientific advances as the control of atomic energy
and to some of the investigations of space currently being made by
astrophysicists.
Einstein
was born in Ulm, Germany, on March 14, 1879, of Jewish parents. He was
a shy and curious child. He attended a rigorous Munich elementary
school where he showed an interest in science and mathematics but did
poorly in other areas of study. He finished high school and technical
college in Switzerland. At age 22 he became a Swiss citizen. In 1903 he
married Mileva Mareć. They had two sons but were later divorced. He
married his widowed cousin Elsa in 1919.
In 1902 Einstein
became an examiner in the Swiss patent office at Bern. In 1905, at age
26, he published five major research papers in an important German
physics journal. He received a doctorate for the first paper.
Publication of the next four papers forever changed mankind's view of
the universe. The first one provided a theory explaining Brownian
movement, the zigzag motion of microscopic particles in suspension. Einstein
suggested that the movement was caused by the random motion of
molecules of the suspension medium as they bounced against the
suspended particles.
A second paper laid the foundation for the
photon, or quantum, theory of light. In it he proposed that light is
composed of separate packets of energy, called quanta or photons, that
have some of the properties of particles and some of the properties of
waves. The paper redefined the theory of light. It also explained the
photoelectric effect, the emission of electrons from some solids when
they are struck by light. Television and other inventions are practical
applications of Einstein's discoveries.
A third paper, which had its beginnings in an essay he wrote at age 16, contained the “special theory of relativity.” Einstein
showed that time and motion are relative to the observer, if the speed
of light is constant and natural laws are the same everywhere in the
universe. This paper introduced an entirely new concept.
The fourth paper was a mathematical addition to the special theory of relativity. Here Einstein presented his famous formula, E = mc2, known as the energy-mass relation. What it says is that the energy (E) inherent in a mass (m) equals the mass multiplied by the velocity of light squared (c2).
The formula shows that a small particle of matter is the equivalent of
an enormous quantity of energy. These papers established Einstein's status among the most respected physicists in Europe.
In 1916 Einstein
published his general theory of relativity. In it he proposed that
gravity is not a force, a previously accepted theory, but a curved
field in the space-time continuum that is created by the presence of
mass.
Between 1909 and 1914 Einstein
taught theoretical physics in Switzerland and Germany. Worldwide fame
came to him in 1919 when the Royal Society of London announced that
predictions made in his general theory of relativity had been
confirmed. He was awarded the Nobel prize for physics two years later;
however, the prize was for his work in theoretical physics, not
relativity theories, which were still considered to be controversial. Einstein
spoke out frequently against nationalism, the exalting of one nation
above all others. He opposed war and violence and supported Zionism,
the movement to establish a Jewish homeland in Palestine. When the
Nazis came to power in Germany in 1933, they denounced his ideas,
seized his property, and burned his books. That year he moved to the
United States. In 1940 he became an American citizen.
Beginning in the 1920s Einstein
tried to establish a mathematical relationship between electromagnetism
and gravitation. He spent the rest of his life on this unsuccessful
attempt to explain all of the properties of matter and energy in a
single mathematical formula.
In 1939, shortly before the outbreak of World War II in Europe, Einstein
learned that two German chemists had split the uranium atom. Enrico
Fermi, an Italian physicist who lived in the United States, proposed
that a chain-reaction splitting of uranium atoms could release enormous
quantities of energy. That same year Einstein
wrote to President Franklin D. Roosevelt warning him that this
scientific knowledge could lead to Germany's development of an atomic
bomb. He suggested that the United States begin preparations for its
own atomic bomb research. Einstein's urging led to the creation of the Manhattan Project and the development of the first two atomic bombs in 1945. Einstein died in Princeton, N.J., on April 18, 1955.
|
|
