CEM 311 Lecture Notes - Lecture 2: Cathode Ray Tube, Subatomic Particle, Alpha Particle
Document Summary
Which subatomic particle was discovered first? electron - on the outside discovery of the electron. Jj thomson, 1897 used an cathode ray tube cathode ray tube glass tube consisting of two electrodes under very low pressure, when high voltage is applied, cathode emitt particles that move toward anode. Thompsons plum pudding model atoms contained electrons "embedded in the atom all went straight (showed that atoms was mostly empty space) What is a alpha particle? conatins two protons and two nuetrons its the nucleus of a helium atom. Why are neutrinos so difficult to detect? neutral in charge not manipulated with electric and magnetic fields. Contains protons (+1 charge, 1 amu) and neutrons ( 0 charge, 1 amu) Cloud of electron takes up most space. Gravity force responsible for attraction between objects that have a mass. Coulomb"s law positive and negitive charges attract and like charges repel q1 and q2 are the changes and r is the distance electromagnetic force.
