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प्रश्न
In a cathode ray tube state the purpose of covering cathode by thorium and carbon.
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उत्तर
Purpose of covering cathode by thorium and carbon is to reduce its work function, decrease its melting point.
संबंधित प्रश्न
Answer the following questions based on a hot cathode ray tube.
What will happen to the beam when it passes through the electric field?
What kind of change takes place in a nucleus when a β -particle is emitted?
A nucleus of an element X which has the symbol `""_84^202` X emits an alpha particle and then a beta particle. The final nucleus is `""_"b"^"a"` Y Find a and b.
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.
Define free electrons.
State any two uses of cathode rays.
What are ‘Becquerel rays’?
An electrons emitter must have how much work function and melting point.
Assertion (A): Hydrogen atom consists of only one electron but its emission spectrum has may lines.
Reason (R): Only Lyman series is found in the absorption spectrum of hydrogen atom whereas in the emission spectrum, all the series are found.
