what are cathode ray experiment and anode ray experiment
Asked by atharvas741 | 28th Oct, 2018, 03:07: PM
Discovery of Electrons
Discovery of Electrons
Discovery of Cathode Rays
- The study of atomic structure and sub-atomic particles was initiated by the discovery of the discharge tube. Experiments on the discharge tube were first conducted in 1878 by an English physicist, William Crookes.
- When a high-voltage electric current is passed through the discharge tube containing a gas at a very low pressure, a green fluorescence is seen coming out of the other end of the discharge tube.
- This fluorescence is the result of rays emitted from the cathode (negative plate) towards the anode (positive plate) in the discharge tube. Hence, these rays are called cathode rays.
- Later, J. J. Thomson studied the characteristics and the constituents of cathode rays.
Discovery of Protons
- A German scientist, E. Goldstein modified the discharge tube and passed an electric current through it.
- He found that positively charged rays were emitted from the anode in the discharge tube. These rays were called canal rays.
- When an electric field was applied, these rays deflected towards the negatively charged plate. Thus, Goldstein concluded that an atom contains positively charged particles along with the electrons.
- These positively charged particles were named as protons by a British scientist, Ernest Rutherford.
- Canal rays were also called anode rays because they emitted from the anode (electrode connected to the positive terminal of a high-voltage source)
Answered by Varsha | 29th Oct, 2018, 12:03: PM
- Calculate the atomic number of an element whose mass number and number of neutrons are 7and 4 respectively.
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