n-type semiconductor is formed
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D
Pentavalent impurity atom i.e., atoms having 5 valence electrons such as antimony (Sb) or arsenic (As), when added to a pure semiconductor, produce excess of free electrons i.e., donor electrons to the semiconductor. For this reason, pentavalent impurity atoms are called donor impurity atom. The semiconductor so produced is called n -type extrinsic semiconductor
So the corresponding wavelength is equal to,
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