Advertisements
Advertisements
प्रश्न
Explain, why radium paint, consisting of zinc sulphide and a trace of radium salt, glows in the dark?
Advertisements
उत्तर
Radium is a radioactive substance. It gives out radioactive radiations which show fluorescence in zinc sulphide. Zinc sulphide is a fluorescent material, so it glows in dark.
संबंधित प्रश्न
Arrange α, β, and γ rays in ascending order with respect to their
1) Penetrating power.
2) Ionising power
3) Biological effect
Under which conditions does the nucleus of an atom tend to radioactive?
What are cathode rays? Why are they called ‘cathode rays’? Name a material which exhibits fluorescence when cathode rays fall on it.
In a cathode ray tube state the purpose of covering cathode by thorium and carbon.
Name the three main parts of a Cathode Ray Tube.
Name a common device where a hot cathode ray tube is used.
What are ‘Becquerel rays’?
Mention one important function of ear main parts:
State the principle on which the functioning of a nuclear reactor is based.
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 ______.
