animation of discovery of cathode ray electrons

The discovery of cathode rays led to a vast field of practical application in Electronics. The glow produced by the fast moving electrons on a fluorescent screen led to its use in radar and television. The oscilloscope has many points in common wit..

In 1885, Sir William Crookes carried out a series of investigations into the behaviour of metals heated in a vacuum. The experiment of Crookes and others showed that a heated cathode produced a stream of radiation, which could cause gases at low pressure to glow and which, make othe..

When the pressure in the discharge tube is less than 10 - 4 mm of Hg, the discharge tube starts showing fluorescence. When this fluorescence was investigated, it was found that the fluorescence consisted of beams of negatively charged electrons. These electrons emanate normally ..

Modern Physics..

. They penetrate through thin sheets of aluminium or other metal. Cathode rays effect photographic plates. The ratio of charge to mass i.e. charge/mass is the same for all the cathode rays irrespective of the type of gas used in the tube. The above observatio..

. Cathode rays can ionise gases. Cathode rays can penetrate through thin sheets of aluminium and silver without perforating them. They can produce fluorescence in many substances. When they impinge on a metal of high atomic weight, X-rays are produc..

An electron is defined as a subatomic particle which carries one unit of electrical charge (1.602 x 10 - 1 9 C) and has a mass (9.1 x10 - 2 8 g). The mass of an electron is almost negligible, being 1/1837 t h the mass of an atom of hydrogen. The charge of an electr..

Electron - Discharge Tube experiments These experiments were conducted in detail by J.J. Thomson and he studied the passage of electricity through gases at extremely low pressure in a cylindrical glass tube. It was discovered that at extremely low pressure, gases become condu..

Discovery of Radioactivity and Nature of Radiations - In 1896, the phenomenon of radioactivity was accidentally discovered by French scientist Henri Becquerel. He was performing experiments with uranium compounds. He accidentally placed a crystal of potassium uranyl sulphate over photogra..

They travel in straight lines and cast shadow of the object placed in their path. These rays are deflected by magnetic and electric fields in the opposite direction to that of cathode rays. The anode rays produce mechanical and heating effects. The..