Home > 1940 in science

The year 1940 in science and technology consisted of many events, including those below.

1 Biology

• February 2 - The first transposons are discovered in maize (Zea mays, aka corn) by Barbara McClintock.

2 Computer science

• February 2 - The Complex Number Calculator, a calculator for complex arithmetic based on relays, was completed. (see History of computing hardware).

3 Chemistry

• February 27 - The radioactive isotope carbon-14 is discovered by Martin Karmen and Ram Ruben
• AstatineAstatine is a chemical element in the periodic table that has the symbol At and atomic number 85. This radioactive element occurs naturally from uranium and thorium decay and is the heaviest of the halogens. Notable characteristics This highly radioactive synthesized by Corson, MacKenzie, and Segre
• Neptuniumuranium neptunium plutonium Pm Np Full table General Name, Symbol, NumberNeptunium, Np, 93 Chemical series Actinides Period, Block 7 , f Density, Hardness 20250 kg/m3, n/a Appearance Silvery metallic Atomic properties Atomic weight 1 E-25 kg|[237] u]] Ato, the first transuranicIn chemistry, transuranium elements (also known as transuranic elements are the chemical elements with atomic numbers greater than 92, the atomic number of Uranium. Of the elements with atomic numbers 1 to 92, all but four (43- technetium, 61- promethium, element, synthesized by McMillan and Abelson

4 Physics

• January 5January 5 is the 5th day of the year in the Gregorian Calendar. There are 360 days remaining until the end of the year (361 in leap years). Events 1463 Poet Francois Villon is banned from Paris. 1477 Battle of Nancy, Charles the Bold killed, Burgundy beco - FM radio demonstrated to the FCCThe Federal Communications Commission (FCC) is an independent United States government agency, created, directed, and empowered by Congressional statute. The FCC was established by the Communications Act of 1934 as the successor to the Federal Radio Commi for the first time
• MagnetronA magnetron is a high-powered vacuum tube that generates coherent microwaves. Construction and Operation A magnetron consists of a hot filament ( cathode) kept at or pulsed to a high negative potential by a high voltage direct current power supply. The ca invented by John RandallAlexander John Randall (born 1955) is a Conservative politician in the United Kingdom. He has been member of Parliament for Uxbridge since 1997, when he was elected in a by-election following the death of Michael Shersby. Randall, John. and Harry Boot