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प्रश्न
When does the nucleus of an atom tend to become radioactive?
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उत्तर
When the number of neutrons exceeds much than the number of protons in a nuclei, it become unstable or radioactive.
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संबंधित प्रश्न
Answer the following questions based on a hot cathode ray tube.
What will happen to the beam when it passes through the electric field?
A radioactive substance is oxidized. Will there be any change in the nature its radioactivity? Give a reason for your answer
In a cathode ray tube, what is the function of anode?
Give one example of isobars.
What do you mean by Mass number.
A radioactive source emits three types of radiations. Name them.
(i) Name the radiations which are charged.
(ii) Name the radiations which are most penetrating.
(iii) Name the radiations which travel with the speed of light.
(iv) Name the radiations which have the largest mass.
What are cathode rays? Why are they called ‘cathode rays’? Name a material which exhibits fluorescence when cathode rays fall on it.
Name a common device where a hot cathode ray tube is used.
State three common properties of beta rays and cathode rays.
The activity of a certain radionuclide decreases to 15 percent of its original value in 10 days. What is its half life?
[ln (0.15) = -1.9]
