Презентация на тему Enrico Fermi A Modern Renaissance Man

Rome29 September 1901): Rome, Italy
Died November 28, 1954 (aged 53):

ChicagoNovember 28, 1954 (aged 53): Chicago, IllinoisNovember 28, 1954 (aged 53): Chicago, Illinois, U.S. Known for
New radioactiveNew radioactive elements by neutron irradiation Controlled
nuclear chain reaction,
Fermi-Dirac statistics
Theory of beta decay

Notable award: Nobel Prize for Physics (1938)

physicists of the 20th century.
He is best known for

his leading contributions in the Manhattan Project but his work spanned every field of physics.

to Alberto Fermi, a Chief Inspector of the Ministry

of Communications, and Ida de Gattis, an elementary school teacher.

As a young boy he enjoyed learning physics and mathematics and shared his interests with his older brother, Giulio. When Giulio died unexpectedly of a throat abscess in 1915 it brought great sorrow to the family and Enrico escaped into his studies.

in the 20th century Italy had slipped behind the

other European countries. That all changed with Enrico Fermi.

friend, Fermi went to Pisa for his university studies.
His

exceptional abilities were recognized by his professors, some of whom received lessons on relativity theory from the young Fermi.

friends had a well-earned reputation as pranksters.
One afternoon, while

patiently trapping geckos (used to scare girls at the university), Fermi came up with the fundamental theory for electrons in solids.
Fermi’s theory later became the foundation of the entire semiconductor industry.

Mario Corbino, who
recognized his talent,
Fermi returned to Rome

as
professor of physics in
1924.

Fermi was only 24 years old but was already an internationally known scientist.

gathered the brightest scientific minds in Italy in his

theoretical physics group, known as the “Via Panisperna Boys.”

Despite that fact that Enrico was only a few years older, his students (half-jokingly) called him “The Pope” because they considered him infallible.

to be far more brilliant than himself. Majorana’s main

fault was that problems were so simple for him to solve that he rarely bothered to write down and publish his calculations.
Majorana became full professor of theoretical physics in Naples University in 1937 without needing to take examination “for high and well-deserved repute, independently of the competition rules.”
A few months afterwards, at the age of 31, Majorana mysteriously disappeared during a boat trip from Palermo to Naples.

University of Rome La Sapienza as an engineering student.

He switched to physics in 1927 to work with Fermi.

Emilio Segrè, Clyde Wiegand, and Owen Chamberlain examining film measuring the rate of antiproton travel, 1955

While Segrè was visiting Berkeley in 1938, Mussolini's Fascist government passed anti-Semitic laws barring Jews from university positions, making Segrè an émigré.
Segrè and Owen Chamberlain (also Fermi’s student) shared the Nobel Prize for their discovery of the anti-proton in 1959.

showed the same intensity in his sports as in

his science.
Often he would win his matches by simply outlasting his opponent.
Yet Fermi was also known for his modesty and would never make much of his achievement.

avoid long, tedious calculations or difficult experimental measurements by

devising ingenious ways of finding approximate answers.

He also enjoyed challenging his friends with “Fermi Problems” that could be solved by such “back of the envelope” estimates.

Laura and Enrico Fermi

equator?”
Fermi problems are solved by assembling simple facts that

combine to give the answer:

The distance from Los Angeles to New York is about 3000 miles.
These cities are three time zones apart.
So each time zone is about 1000 miles wide.
There are 24 time zones around the world.
So the length of the equator must be about 24,000 miles

The exact answer is 24,901 miles.

on the Back of a Cocktail Napkin
by Lawrence

Weinstein , John A. Adam
Price: ~ $14.00

the nuclear experiments of Frédéric and Irène Joliot-Curie, he

immediately shifted his group’s work from theory to experiment.

in Physics for "demonstrations of the existence of new

radioactive elements produced by neutron irradiation, and for his related discovery of nuclear reactions brought about by slow neutrons".

Stockholm, Fermi and his family emigrated to New York,

mainly because of the fascist regime’s anti-Semitic laws, threatened his wife Laura, who was of Jewish descent.

World War II. The United States, initially neutral, was

drawn in after Pearl Harbor is attacked in December 1941.

by a group of fellow physicists, the world’s most

famous scientist, Albert Einstein, writes a historic letter to President Roosevelt.

first studied by Enrico Fermi but the results were

not fully understood at the time.
After Fermi’s publication, Lise Meitner, Otto Hahn and Fritz Strassmann began performing similar experiments in Germany.
In 1939, they discovered that the uranium nucleus split (fission) under neutron bombardment, releasing nuclear energy.

early as 1933 by Leo Szilard, although Szilard at

that time had no idea with what materials the process might be initiated.
Fermi and Szilard proposed the idea of a nuclear reactor (pile) with natural uranium as fuel and graphite as moderator of neutron energy.

(CP-1) , the world's first nuclear reactor.
Due to

a construction labor strike, he built it inside a squash court at the University of Chicago.

The first artificial, self-sustaining, nuclear chain reaction was initiated within CP-1, on Dec. 2, 1942.

just a theoretical possibility but an experimental fact.
At that

point, enormous resources were poured into the Manhattan Project in an effort to produce the atomic bomb, a decisive weapon to end the war.

had been severely handicapped by the German physicists belief

that heavy water was necessary as a neutron moderator.

The Germans were short of heavy water because of Allied efforts to prevent Germany from obtaining it and they never stumbled on the secret of using purified graphite instead.

Nazi German experimental nuclear pile at Haigerloch

work in particle physics, especially related to pions and

muons.
He was also known to be an inspiring teacher at the University of Chicago. His lecture notes were transcribed into books and are still used today.

stomach cancer; two of his assistants working on or

near the nuclear pile also died of cancer.
Fermi and his team knew that their work carried considerable risk but they considered the outcome so vital that they forged ahead with little regard for their own personal safety.

near Chicago, is a Department of Energy national laboratory

specializing in high-energy particle physics.
Fermilab's Tevatron particle accelerator, four miles in circumference, is the world's highest energy particle accelerator.