Who was Sir Joseph John "J.J." Thomson?
Q: Who was Sir Joseph John "J.J." Thomson?
A: Sir Joseph John "J.J." Thomson was a British physicist and Nobel laureate who discovered the electron and isotopes, and invented the mass spectrometer.
Q: What did J.J. Thomson say about electricity in 1893?
A: In 1893, J.J. Thomson said "There is no other branch of physics which affords us so promising an opportunity of penetrating the secret of electricity."
Q: What did J.J. Thomson discover in 1897?
A: In 1897, J.J. Thomson showed that cathode rays were composed of a previously unknown negatively charged particle of very small mass compared to its electric charge - later known as the electron - which was the first subatomic particle to be found.
Q: What did J.J Thompson hypothesize about atoms in atomic theory?
A: In atomic theory he hypothesized that atoms were spheres of evenly spread positive charge, where an individual negatively charged electron resided within each atom sphere .
Q: When did J.J Thompson find evidence for isotopes? A: He found the first evidence for isotopes of a stable (non-radioactive) element in 1913 while studying anode rays (positive cations).
Q: How many famous physicists studied with him at University of Cambridge? A: Many young men who studied and worked with him at University of Cambridge also became famous physicists
