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प्रश्न
What are cathode rays? Why are they called ‘cathode rays’? Name a material which exhibits fluorescence when cathode rays fall on it.
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उत्तर
Cathode rays are the stream of negatively charged particles called electrons. They are called cathode rays because they are given out from cathode in a discharge tube operating at about 10,000 V when the pressure inside the tube is about 0.01 mm of Hg. Zinc Sulphide exhibits fluorescence when cathode rays fall on it.
संबंधित प्रश्न
When does the nucleus of an atom tend to become radioactive?
Name the radiations which are absorbed by greenhouse gases in the earth’s atmosphere.
Answer the following questions based on a hot cathode ray tube.
What will happen to the beam when it passes through the electric field?
Define the term radioactivity.
How is a cathode ray beam affected while passing through a magnetic field?
Name a common device where a hot cathode ray tube is used.
What is meant by Radioactivity?
State three common properties of beta rays and cathode rays.
The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be ______.
In U238 ore containing Uranium the ratio of U234 to Pb206 nuclei is 3. Assuming that all the lead present in the ore is final stable product of U238. Half life of U238 to be 4.5 × 109 years and the age of ore is ______ × 109 years. (in 109 years)
