Advertisements
Advertisements
प्रश्न
Explain, why radium paint, consisting of zinc sulphide and a trace of radium salt, glows in the dark?
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.
APPEARS IN
संबंधित प्रश्न
When does the nucleus of an atom tend to become radioactive?
Name the radiations which are absorbed by greenhouse gases in the earth’s atmosphere.
What are free electrons?
Explain the use of radioactive in the field of medicine, agriculture and industry.
What is nucleus of an atom? Compare its size with that of the atom. Name its constitutents. How is the number of these constituents determined by the atomic number its atomic model.
How is a cathode ray beam affected while passing through a magnetic field?
In a cathode ray tube state the purpose of covering cathode by thorium and carbon.
Mention four properties of Becquerel rays.
The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be ______.
