This essay Jahind Davis has a total of 848 words and 5 pages.
Joseph John Thomson was born in 1856 in Cheetham Hill, Manchester,
England. His mother, Emma Swindells, came from a local textile
family. His father, Joseph James Thomson, ran an antiquarian bookshop
founded by a great-grandfather. He had a brother two years younger
than him, Frederick Vernon Thomson.
His early education was in small private schools where he
demonstrated great talent and interest in science. In 1870 he was
admitted to Owens College at the unusually young age of 14. His
parents planned to enroll him as an apprentice engineer to Sharp-
Stewart & Co, a locomotive manufacturer, but these plans were cut
short when his father died in 1873. He moved on to Trinity College,
Cambridge in 1876. In 1880, he obtained his BA in mathematics (Second
Wrangler and 2nd Smith's Prize) and MA (with Adams Prize) in 1883. In
1884 he became Cavendish Professor of Physics. One of his students
was Ernest Rutherford, who later succeeded him in the post.
In 1890 he married Rose Elisabeth Paget, daughter of Sir George
Edward Paget, KCB, a physician and then Regius Professor of Physic at
Cambridge. They had one son, George Paget Thomson, and one daughter,
Joan Paget Thomson.
One of Thomson's greatest contributions to modern science was in his
role as a highly gifted teacher: seven of his research assistants and
his son won Nobel Prizes in physics. His son won the Nobel Prize in
1937 for proving the wavelike properties of electrons.
He was awarded a Nobel Prize in 1906, "in recognition of the great
merits of his theoretical and experimental investigations on the
conduction of electricity by gases." He was knighted in 1908 and
appointed to the Order of Merit in 1912. In 1914 he gave the Romanes
Lecture in Oxford on "The atomic theory". In 1918 he became Master of
Trinity College, Cambridge, where he remained until his death. He
died on 30 August 1940 and was buried in Westminster Abbey, close to
Sir Isaac Newton.
Thomson was elected a Fellow of the Royal Society on 12 June 1884 and
was President of the Royal Society from 1915 to 1920. (1)
J.J. Thomson's Atomic Model and Theory
Thomson discovered the electron in the year 1897. His work put
forward a new theory, that atom was made up of small particles.Thus
he discovered the electrons. He proved his theory using the cathode
Scientists had already done many experiments to find the structure of
the atom. They passed an electric current through a vacuum tube. They
saw a light glowing inside the tube. It travelled in a straight line.
They could not explain the phenomenon. Thomson did more experiments
on the cathode tube. He placed two electric plates on its path. One
was positively charged. The other was negatively charged. The glowing
light bent towards the positively charged plate.and found that the
glowing materials bent towards the positively charged plate. He found
out that the glowing light were smaller particles. They were smaller
than the atom. Thus Thomson found the particle called electron. Thus
J.J.Thomson's atomic theory was found.
Thomson suggested that the electrons came out ofthe trace gas that
was inside the cathode tube. Thus a new theory that atoms were made
of tiny particles surfaced.
Thomson discovered the electrons and it was proved that atoms were
made up of protons, electrons and neutrons. Thus
Thomson proved that the atom was divisible. Since the atom was
neutral, Thomson suggested that the negatively charged electron
equalled the positively charged proton and neutrons had no
charges.Thomson suggested to consider the atom as a sphere. It has
positively charged particles. The positively charged particles is
surrounded by the negatively charged electons. The electrons were
placed there due to electrostatic forces. (2)
What is a Cathode Ray Tube?
Even without consciously realizing it, most of us are already aware
of what a cathode ray tube is.
Look at any glowing neon sign or any 'old-fashioned' television set,
and you are looking at the modern descendants of the cathode ray
Physicists in the 19th century found out that if they constructed a
glass tube with wires inserted in both ends, and pumped out as much
of the air as