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Question
In a cathode ray tube state the purpose of covering cathode by thorium and carbon.
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Solution
Purpose of covering cathode by thorium and carbon is to reduce its work function, decrease its melting point.
RELATED QUESTIONS
Answer the following questions based on a hot cathode ray tube.
State the approximate voltage used to heat the filament
State the energy conversion taking place in a cathode ray tube
What is thermionic emission?
What are isobars?
Radiations given out from a source when subjected to an electric field in a direction perpendicular to their path are shown below in the diagram. The arrows show the path of the radiation A, B and C. Answer the following questions in terms of A, B and C.
1) Name the radiation B which is unaffected by the electrostatic field.
2) Why does the radiation C deflect more than A?
3) Which among the three causes the least biological damage externally.
4) Name the radiation which is used in carbon dating.
State two characteristics of the substance used as thermionic emitter.
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The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be ______.
