The charge to mass ratio of electron is em is the ratio between the charge of the electron by the mass of the electron which is 1. In solving many physics problems, it is necessary to use the value of one or more physical constants. The electron beam leaves a visible trail in the tube, because some of the electrons collide with helium atoms, which are excited and then radiate visible light. The masstocharge ratio mq is a physical quantity that is most widely used in the electrodynamics of charged particles, e. Lab 7 electron chargetomass ratio objectives to understand how electric and magnetic fields impact an electron beam to experimentally determine the electron chargetomass ratio overview in this experiment, you will measure em, the ratio of the electron s charge e to its mass m. Measurement of chargetomass em ratio for the electron. Chargetomass ratio for the electron u of t physics. Electron charge to mass ratio matthew norton, chris bush, brian atinaja, becker steven. Charge and mass of the electron michigan state university. Norton 1 abstract the electron charge to mass ratio was an experiment that was used to calculate the ratio of the electron s charge to its mass. Pdf success of a merger or acquisition a consideration. Thompson discovered the first elementary particle, the electron, by measuring the ratio of its charge to mass in a manner similar to the experiment that we will perform. The charge to mass ratio of an electron was studied using an electron beam tube and two.
P31220 lab 1 charge to mass ratio of the electron purpose. A beam of electrons was used that was subjected to a. To avoid accidental overshoot run the power supply at a low setting in a constant current mode. Charge to mass ratio of electron was found out using the jj thomson experiment. The determination of the charge to mass ratio of the electron a magnetic field produced by helmholtz coils is used to deflect electrons into circular paths whose radii are known. In this laboratory, we study the interaction of electrons and a magnetic field, with the specific pur pose to. While the concept of atom dates back to the ancient greeks, the current picture of an atom is. Chargetomass ratio for the electron introduction this is a variation of the original experiment carried out by j. By knowing the energy of the electrons and the magnetic field strength, the ratio of the charge to mass em of the electron is determined. In 1897, thomson set out to prove that the cathode rays produced from the cathode were actually a stream of negatively charged particles called electrons. Charge to mass ratio of the electron vanderbilt university.