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Which of the following theories can be adopted to rectify the drawbacks of classical theory?

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Which of the following theories can be adopted to rectify the drawbacks of classical theory?

(a) Compton theory

(b) Quantum theory

(c) Band theory

(d) Electron theory

I had been asked this question in exam.

This interesting question is from Free Electron Theory topic in section Semiconductors of Engineering Physics II

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Best answer
The correct option is (b) Quantum theory

Easy explanation: In classical theory, the properties of metals, such as electrical and thermal conductivities are well explained on the assumption that the electrons in the metal freely moves like the particles of a gas. Hence it can be used to rectify the drawbacks of classical theory.

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