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प्रश्न
Why do metals have a large number of free electrons?
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उत्तर
In metals, the electrons in the outermost shells are loosely bound to the nucleus. Even at room temperature, there are a large number of free electrons which are moving inside the metal in a random manner.
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संबंधित प्रश्न
Define the term "Threshold frequency", in the context of photoelectric emission.
In which case is electron emission from a metal not known?
Give an example each of a metal from which photoelectric emission takes place when irradiated by
- UV light
- visible light.
Name the factors on which photoelectric emission from a surface depends.
The work function of a metal is 2.31 eV. Photoelectric emission occurs when the light of frequency 6.4 × 1014 Hz is incident on the metal surface. Calculate
- the energy of the incident radiation,
- the maximum kinetic energy of the emitted electron and
- the stopping potential of the surface.
What is responsible for electrical conduction in metals?
What is the work function (\[\phi_0\]) of a metal?
Under what condition does an electron escape after external energy is supplied?
Which is an example of thermionic emission?
Which is an example of field emission?
