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प्रश्न
When is said to be the nucleus unstable?
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उत्तर
The nucleus is said to be unstable when radiations (alpha, beta, gamma rays) are emitted by the nucleus.
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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?
Arrange α, β, and γ rays in ascending order with respect to their
1) Penetrating power.
2) Ionising power
3) Biological effect
Represent the change in the nucleus of a radioactive element when a β particle is emitted.
Under which conditions does the nucleus of an atom tend to radioactive?
What happens if the negative potential is changed on a grid?
Name a gas caused by the Greenhouse effect
What is meant by radioactivity?
In the following fig. shows a radioactive source S in a thick lead container. The radiations pass through an electric field between the plates P and Q. Complete the diagram to show the paths of α , β and γ radiations.
Why is the source S placed in a thick lead container?
Draw a diagram of a simple atom showing the nucleus and electrons. In this atom:
(a) What type of charge will there be on the nucleus?
(b) What is the value of this charge?
How is a cathode ray beam affected while passing through a magnetic field?
How is a cathode ray beam affected while passing through an electric field?
What are cathode rays? Why are they called ‘cathode rays’? Name a material which exhibits fluorescence when cathode rays fall on it.
State any two uses of cathode rays.
Why are materials of low work function preferred as thermionic cathode materials?
In a cathode ray tube state. How is it possible to increase the rate of emission of electrons.
What is meant by Radioactivity?
State three common properties of beta rays and cathode rays.
What is the value of the speed of gamma radiations in air or vacuum?
The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be ______.
A deuteron strikes 8O16 nucleus with subsequent emission of an alpha particle. Identify the nucleus so produced:
