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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.
संबंधित प्रश्न
Answer the following questions based on a hot cathode ray tube
Name the charged particles
What are free electrons?
What happens if the negative potential is changed on a grid?
What is thermionic emission?
A nucleus `""_11^24Na` emits a beta particle to change into Magnesium (Mg)
(i) Write the symbolic equation for the process.
(ii) What are numbers 24 and 11 called?
(iii) What is the general name of `""_12^24Mg `with respect to `""_11^24Na` ?
What do you mean by Mass number.
During the emission of a beta particle, the ______ number remains same.
How is a cathode ray beam affected while passing through an electric field?
An electrons emitter must have how much work function and melting point.
If 10% of a radioactive substance decays in every 5 years, then the percentage of the substance that will have decayed in 20 years will be ______.
