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2. The Discovery of the Electron
About this Lecture
In this mini-lecture, we discuss the discovery of the electron. In particular, we consider: (i) a cathode ray tube demonstration; (ii) a demonstration of crossed fields where perpendicular magnetic and electric fields are set up, and an electron beam in the system can be bent upon manipulation of the magnetic field; (iii) the left hand rule, involving force, magnetic field, and current; (iv) J.J. Thomson’s cathode ray tube experiment used to determine the specific charge of an electron; and (v) Millikan’s oil drop experiment that was used to determine the charge of an electron.
In this course, Dr Janet Lovett (University of St Andrews) explores properties of matter. Throughout this course, we present 14 demonstrations. In the first mini-lecture, we discuss atomic structure and look specifically at what makes up the elements (protons, neutrons, and electrons), models of the atom, energy levels, and element emission spectra. In the second mini-lecture we explore the discovery of the electron, focusing on a series of demonstrations that illustrate J.J. Thomson’s cathode ray experiment and how electron charge was first determined. The third mini-lecture turns towards nuclear physics, where we discuss nuclide stability, mass and energy, binding energy per nucleon to understand nuclear fusion and fission, and radioactivity. In the fourth mini-lecture, we take a step back from atoms to consider matter as a whole, specifically discussing the phases of matter, and how pressure and temperature affect these phases. In the fifth mini-lecture, we explore the relationships between pressure, volume, temperature, and number of particles before introducing the ideal gas law. In the sixth mini-lecture, we look at the forces between particles and how they interact in a substance.
Janet Lovett is a Lecturer in the School of Physics and Astronomy at the University of St Andrews. Her primary research interest is in measuring nanometre distances for structural biology using Electron Paramagnetic Resonance (EPR) spectroscopy. Dr Lovett teaches a first-year ‘Properties of Matter’ course at the University in addition to other courses such as magnetic resonance.
Cite this Lecture
Lovett, J. (2022, January 12). Properties of Matter - The Discovery of the Electron [Video]. MASSOLIT. https://massolit.io/courses/properties-of-matter/the-discovery-of-the-electron
Lovett, Janet. "Properties of Matter – The Discovery of the Electron." MASSOLIT, uploaded by MASSOLIT, 12 Jan 2022, https://massolit.io/courses/properties-of-matter/the-discovery-of-the-electron