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Relate number densities of holes and ele...

Relate number densities of holes and electrons with the number density of ionised atoms.

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`" "n_(e )n_(h) = n_(i)^(2)`
where,`" " n_(e )`- number density of electrons,
`" "n_(h)`- number density of holes and
`" "n_(i)`- number density of ionised atoms.
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