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Question

The band spectrum is caused by:
molecules
atoms
any substance in solid state
any substance in liquid state

A

atoms

B

any substance in liquid state

C

any substance in solid state

D

molecules

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Solution

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The band spectrum is caused by molecules. The energy levels of molecules are so close to each other that they combine to form a band. The valence band and conduction band are two types of bands. Electron transition between these two bands form band spectrum.

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