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Bohr's Model of an Atom

27. What is v...

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27. What is valence band and conduction band and why an electron is able to make movements inside them

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Q. Assertion :We kn ow that a conduction band is an empty band just above the valence band into which electrons can pass. Reason: In conductors , the valence band is itself the conduction band.

Q. Assertion :If there is some gap between the conduction band and the valence band, electrons in the valence band all remain bound, and no free electrons are available in the conduction band. Reason: Some of the electrons in the valence band may gain external energy to cross trhe gap between the conduction band and the valence band.

Q. When an electron goes from the valence band to the conduction band in silicon, its energy is increased by 1.1 eV. The average energy exchanged in a thermal collision is of the order of kT which is only 0.026 eV at room temperature. How is a thermal collision able to take some to the electrons from the valence band to the conduction band?

Q. Assertion :In some solids, the valence band is completely filled while the next higher band separated by an energy gap of few electrons-volts is completely empty. Reason: In insulators the energy band completely filled with electrons( the valence band) and above it is empty band (the conduction band)

Q. In a/an _________, the valence band and conduction band overlap each other.

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