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At what temperature the donor states are completely ionized?

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At what temperature the donor states are completely ionized?

(a) 0 K

(b) ROOM

(c) 300K

(d) 900K

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The query is from Donor and Acceptor impurities in section Conduction in Semiconductors of Electronic Devices & Circuits

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The correct option is (b) ROOM

Explanation: At room temperature, the donors have donated their electrons to the conduction band.

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