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प्रश्न
What is thermionic emission?
उत्तर
The emission of electrons from a metal surface when heat energy is imparted to it is called thermionic emission
संबंधित प्रश्न
When does the nucleus of an atom tend to become radioactive?
Write one use of cathode ray tube.
State any two precautions to be taken while handling radioactive substances
An element P disintegrates by α - -emission and the new element suffers two further disintegrations, both by β -emission, to form an element Q. Explain the fact that P and Q are the isotopes.
State three safety precautions that you would take while handling the radioactive substances.
What are cathode rays? Why are they called ‘cathode rays’? Name a material which exhibits fluorescence when cathode rays fall on it.
How is a cathode ray tube used to convert an electrical signal into a visual signal?
Which part of the atom undergoes a change in the process of radioactive decay?
Complete the following radioactive reaction:
\[\ce{^-_-X -> ^-_-Y + ^4_2He -> ^234_91Z + ^0_-1e}\]
