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प्रश्न
Emission of electrons by the absorption of heat energy is called ____________ emission.
पर्याय
photoelectric
field
thermionic
secondary
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उत्तर
Emission of electrons by the absorption of heat energy is called thermionic emission.
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संबंधित प्रश्न
The work function of caesium metal is 2.14 eV. When light of frequency 6 × 1014 Hz is incident on the metal surface, photoemission of electrons occurs. What is the
- maximum kinetic energy of the emitted electrons,
- Stopping potential, and
- maximum speed of the emitted photoelectrons?
Why should gases be insulators at ordinary pressures and start conducting at very low pressures?
How does one explain the emission of electrons from a photosensitive surface with the help of Einstein's photoelectric equation?
Would you prefer a material with a high work-function or a low work-function to be used as a cathode in a diode?
Why does thermionic emission not take place in non-conductors?
The cathode of a diode valve is replaced by another cathode of double the surface area. Keeping the voltage and temperature conditions the same, will the place current decrease, increase or remain the same?
The anode of a thermionic diode is connected to the negative terminal of a battery and the cathode to its positive terminal.
Answer the following question.
Define the term "Threshold frequency", in the context of photoelectric emission.
What do you mean by electron emission? Explain briefly various methods of electron emission.
Name the factors on which photoelectric emission from a surface depends.
