0009 Study Guide - Ernst Ruska, Edwin Hubble, Max Knoll
Document Summary
In 1897 j. j thomson discover the electron , 1886 gold stien discover the proton and 1932 neutron was by jemes chedwick . In 1911 rutherford discovered the nucleous in atom. In 1913 bohr give the atomic theory. in 1927 dual nature of electron was proved by germer and his colleague. Flaming discover the pencillin . in 1929, edwin hubble published one of the most famous scientific papers of all time. He detailed what would later be known as hubble"s law, which explains how the universe is continually expanding, a postulation that changed humankind"s understanding of space. in. 1930, british geologist arthur holmes established the first absolute timescale. Berlin"s ernst ruska, a physicist, and max knoll, an electrical engineer, created the first electron microscope. This development overcame a huge barrier for microscopes and aided discoveries in physics. in 1933 a neutron star is created when a large star four to eight times as big as the sun explodes in a supernova.
