Advertisements
Advertisements
प्रश्न
Name a common device where a hot cathode ray tube is used.
Advertisements
उत्तर
Hot cathode ray tube is used in T.V.
संबंधित प्रश्न
Name the unit in which the work function of a metal is expressed.
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?
What happens to the position of an element in the periodic table when it emits an alpha particle
State two characteristics of the substance used as thermionic emitter.
What are cathode rays? Why are they called ‘cathode rays’? Name a material which exhibits fluorescence when cathode rays fall on it.
State three ways of obtaining an electron-beam.
The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be ______.
In U238 ore containing Uranium the ratio of U234 to Pb206 nuclei is 3. Assuming that all the lead present in the ore is final stable product of U238. Half life of U238 to be 4.5 × 109 years and the age of ore is ______ × 109 years. (in 109 years)
A radioactive element is placed in an evacuated chamber. Then the rate of radioactive decay will ______.
