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प्रश्न
Name two radioactive substances.
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उत्तर
Two radioactive substances are Uranium, Radium.
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संबंधित प्रश्न
Represent the change in the nucleus of a radioactive element when a β particle is emitted.
What is meant by radioactivity?
State two similarities and two dissimilarities between the γ-rays and X-rays.
What kind of change takes place in a nucleus when a β -particle is emitted?
A radioactive substance is oxidized. What changes would you expect to take place in the nature of radioactivity? Explain your answer.
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.
State three common properties of beta rays and cathode rays.
The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be ______.
Two radioactive materials A and B have decay constants 25λ and 16λ respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of B to that of A will be "e" after a time `1/("a"lambda)` The value of a ______.
