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With reference to semiconductor physics, answer the following questions. What is meant by…

Physics20232 marksShort answer
With reference to semiconductor physics, answer the following questions.
(i)[1.0]
What is meant by “Forbidden band” of energy levels?
(ii)[1.0]
In which material “Forbidden band” is absent?

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Semiconductor Electronics: Materials, Devices and Simple Circuits

From ISC 2023 Physics Paper 1, question 8.