Question

Enumerate the difference between thermionic emission and liquid vaporization

Answer 1

Answer:

During thermionic emission electrons are emitted from metal surface by providing heat energy, whereas, during photoelectric emission light energy is emitted when, electrons are emitted from the surface of metal.

Answer 2

Answer:

• Thermionic emission is the thermally convinced inflow of charge carriers from a face or over an implicit- energy barrier.
• This occurs as we know that the thermal energy which is given to the carrier overcomes the work function of the material.
• After emission, a charge that is equal in magnitude and opposite in sign to the total charge emitted is left in the emitting region.
• But if the emitter is connected to a battery, the charge that is left before is annulled by the charge supplied to the battery as the emitted charge carriers move down from the emitter, and eventually, the emitter will be in the same state as it was in the before emission.

• Vaporization is the process in which the liquid state changes into the vapour state.
• Also when the temperature increases, the kinetic energy of the molecules increases.
• Due to this increase in kinetic energy, the force of attraction between the molecules reduces, which in turn escape into the surrounding in the form of vapours.
• This process shows the consumption of heat energy.

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