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प्रश्न
What do you understand by the term radioactivity?
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उत्तर
The process of self, spontaneous and random emission of a or P and y radiations from the nucleus of elements of atomic number higher than 82, is called radioactivity.
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संबंधित प्रश्न
What are free electrons?
Write one use of cathode ray tube.
In a cathode ray tube state:
(i) the purpose of covering cathode by thorium and carbon.
(ii) the purpose of the fluorescent screen.
(iii) how is it possible to increase the rate of emission of electrons.
Define the term radioactivity.
State two characteristics of the substance used as thermionic emitter.
How is a cathode ray beam affected while passing through an electric field?
In a cathode ray tube state the purpose of covering cathode by thorium and carbon.
A certain nucleus has a mass number 20 and atomic number 9. Find the number of neutrons and protons present in it.
Justify with reason, whether the following nuclear reactions are allowed or not.
\[\ce{^A_Z X -> ^A_{Z - 2}X + ^4_{2}He}\]
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)
