Advertisements
Advertisements
प्रश्न
An electrons emitter must have how much work function and melting point.
Advertisements
उत्तर
An electron emitter must have low work function and high melting point.
संबंधित प्रश्न
What is meant by radioactivity?
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?
A nucleus is \[\ce{^24_11 Na}\] β-radioactive.
Write the equation represent β-decay.
Name the three main parts of a Cathode Ray Tube.
Name a common device where a hot cathode ray tube is used.
A certain nucleus has a mass number 20 and atomic number 9. Find the number of neutrons and protons present in it.
88Ra226 experiences three α - decay. Find the number of neutrons in the daughter element.
The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be ______.
The mean lives of a radioactive substance are 1620 and 405 years for β-emission and β-emission respectively. The time after which three fourth of a sample will decay if it is decaying both by β-emission and β-emission simultaneously will be ______ years.
(Take ln 2 = 0.693)
A radioactive element is placed in an evacuated chamber. Then the rate of radioactive decay will ______.
