Discharge tube experiment pdf file

Thomson cathode ray tube experiment showing electron beam a cathoderay tube crt is a large, sealed glass tube. Pdf experimental study of a lowpressure glow discharge in air in. Pdf the initiation and characteristics of a lowpressure glow discharge in air in. Be sure the high voltage for the gaseous discharge is off and the installed discharge tube is cool before changing discharge tubes.

Cathode rays from the cathode carrying different energies. Discharge tube showing path of cathode rays electrons. Weaklyconducting exterior solid weaklyconducting interior gas wcg stronglyconducting interior gas scg applied interior pressure p electrodes cathode and anode model as ideal capacitor with dielectric d applied potential difference v applied electric field e particle drifts. Pdf the detection of cathode rays was a byproduct of the investigation of. And discharge tube includes cathode k, anode a and glass tube or metal tube filling with gas. An emission spectrum can be produced by a discharge tube which contains a small amount of gas and two electrodes. Operating plateau for the geiger tube the purpose of this experiment is to determine the voltage plateau for the geiger tube and to establish a reasonable operating point for the tube. In this experiment, the independent variable was the pressure in the discharge tube i. The clever experiment exploits two ideas that were known about the interaction between electromagnetic fields and charged particles. In this experiment, it will be observed that the cathode ray.

Simulation of gas discharge in tube and paschen s law. Do not touch it when it is on or has recently been on. Electrons in the gas atoms or molecules are excited into higher energy levels. In discharge tube experiment, at low pressure and at very high voltage, an electric current is passed. Conditions for the normal regime of a glow discharge. Introduction there are many different meters used to measure fluid flow. Rontgens experiment on 8 november 1895, rontgen wrapped some black cardboard around a crookes tube attached to a ruhmkorff induction coil, in other words a stepup transformer excited by repeated electrical pulses. The purpose of this experiment is to determine the voltage plateau for the geiger tube and to establish a reasonable operating point for the tube. The electric discharge experiments university of washington. By moving the negative terminal to different cathodes. Due to passage of electric current, a stream of rays is passed in the tube originating from cathode. Gm counter, counting statistics and absorption crosssection. The colour of glow of the glass depended on the type of glass, it being yellowishgreen for soda glass.

Conclusion in this experiment the independent variable was. In this lesson learn what a cathode ray tube is and how j. In a gas discharge tube it is possible to observe both cathode. Qualitative observation of cathode rays and canal rays under the influence of magnetic fields. Thomson, cathode rays and the electron introduction. Visual physics online school of physics university of sydney. When a high voltage is applied across the electrodes, electrons flow and heat the gas and may become ionized. Objective the main objectives of this experiment is to obtain the coefficient of discharge from experimental data by utilizing venturi meter and, also the relationship between reynolds number and the coefficient of discharge. A fluorescent glow appeared on the glass opposite to cathode. The use of dc glow discharges as undergraduate educational tools. Please keep ngers o the di raction grating and lenses. J j thomson and the discovery of the electron st andrews. An orifice is an opening in the side or base of tank or reservoir through which fluid is discharge in the form of a jet.