CBSE Class 9 Answered
Explain the formation of cathode rays as stated by Thomson. What is the absolute mass of an electron?
Asked by Topperlearning User | 30 Mar, 2016, 03:54: PM
Expert Answer
- A British scientist J.J. Thomson was the first one to discover the electron in the year 1897.
- J.J. Thomson performed an experiment to know the characteristics and constituents of the cathode rays.
- Thomson passed electricity at a high voltage through the discharge tube containing a gas at a very low pressure. A green fluorescence was seen coming out from 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 as cathode rays.
- The mass and charge of the cathode ray particles does not depend on the gas taken in the discharge tube.
Answered by | 30 Mar, 2016, 05:54: PM
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