January 7 in Physics History

Physics history will help you to develop a better understanding of the physics world!

birthdays & deaths

Explore all birthdays & deaths of physicists occurred on this day with their short biography!

physics Events

Know all important discoveries made by physicists & events happened on this day with complete information!

January 7 in Physics History - Births – Physicists born on January 7

Johann Philipp Reis (7 Jan 1834 - 14 Jan 1874)

He was a German physicist who invented the telephone even before Alexander Graham Bell. He managed to make a fragile, clumsy transmitter after years of experimentation. He used an animal membrane to make it. But his device was not capable of transmitting intelligible speech. Reis was the scientist who coined the term Telephone’. He successfully converted electricity into auditory waves in 1861. Though his efforts didn’t impress the professors and it was never patented.

Stephen Groombridge (7 Jan 1755 - 30 Mar 1832)

He was an English astronomer and merchant who made the Groombridge Catalogue, a catalog of Circumpolar stars. He made observations for 10 years and another 10 years to adjust the data to correct for refraction and clock errors. He was diagnosed with a severe attack of paralysis but never fully recovered. During this period, his work was continued by others. His catalog covered 4,243 stars having apparent magnitudes greater than 9.

January 7 in Physics History - Deaths – Physicists died on January 7

Nikola Tesla (10 Jul 1856 - 7 Jan 1943)

He was a Serbian-American inventor and researcher who invented the first induction motor in 1884. He worked on alternating current. He invented a number of devices including the application of dynamos, transformers, and motors. He discovered the benefits of rotating magnetic fields.

Alfred Kastler (3 May 1902 - 7 Jan 1984)​

He was a French physicist who discovered and developed the method for observing Hertzian Resonances within atoms. His discovery earned him the Nobel Prize for Physics in 1966. This research helped in understanding the structure of an atom by studying the radiations that atoms emit. He also developed optical pumping which caused atoms in a sample substance to enter higher energy States. This helped in the development of masers and the lasers that used the light energy that was readmitted when excited atoms released the extra energy obtained from optical pumping.

Josef Stefan (24 Mar 1835 - 7 Jan 1893)​

He proposed a law of radiation (1879) stating that the amount of energy radiated per second from a black body is proportional to the fourth power of its absolute temperature. (A black body is a theoretical object that absorbs all radiation that falls on it.) This law is known as Stefan’s law or the Stefan-Boltzmann law. He also studied electricity, the kinetic theory of gases, and hydrodynamics.

Alfred Ewing (27 Mar 1855 - 7 Jan 1935)

He was a Scottish physicist who was born and educated in Dundee. He discovered hysteresis. He later became a professor of mechanical engineering and physics at Tokyo University. He also devised instruments to measure earthquakes. During WW I, he and his staff took the task to decipher coded messages. He also helped Sir Willian Thomas.

January 7 in Physics History - Events – Physics Events of January 7

Moon's Crater

Galileo was the first to see the moon’s cratered surface using his twenty-powered spyglass. In 1610, he wrote that moon is most evidently not at all smooth and regular surface. He also mentioned that the surface of the moon is full of prominences and cavities. Months later, he published his observations and conclusions in considerable detail.

Discovery of Francium (Fr) Element

The element Francium(Fr) was discovered in 1830. It was the last naturally occurring element to be found. Its atomic number is 76 and it is the heaviest alkali metal atom. Marguerite Perey worked on actinium for years which was believed to produce the new element by alpha decay. On 7th Jan 1939, she recorded the half-life of Francium as 20 minutes. It was checked and confirmed at the Acadèmie des Sciences. Mendeleev had also anticipated the discovery of Francium in his periodic table.

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