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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?
What are free electrons?
Write one use of cathode ray tube.
Represent the change in the nucleus of a radioactive element when a β particle is emitted.
What happens if the negative potential is changed on a grid?
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 Atomic mass
What happens to the atomic number of element when (i) An α -particle, (ii) A β -particle 1 and (iii) γ-radiation is emitted?
What happens to the mass number of an element when (i) an α -particle, (ii) a β -particle, and (iii) γ -radiation is emitted?
What are the uses of radioactive isotopes in following?
(a) Medical field,
(b) Agriculture,
(c) Industries?
A radioactive source emits three types of radiations.
Name the radiation which has the highest ionizing power.
In a cathode ray tube state the purpose of covering cathode by thorium and carbon.
What do you understand by the term radioactivity?
Justify with reason, whether the following nuclear reactions are allowed or not.
\[\ce{^A_Z X -> ^A_{Z + 1}Y + ^0_{-1}β}\]
Justify with reason, whether the following nuclear reactions are allowed or not.
\[\ce{^A_Z X -> ^A_{Z - 2}X + ^4_{2}He}\]
What is the value of the speed of gamma radiations in air or vacuum?
Mention four properties of Becquerel rays.
88Ra226 experiences three α - decay. Find the number of neutrons in the daughter element.
A radioctive sample decays `7/8` times its original quantity in 15 minutes. The half-life of the sample is ______.
