Current electricity questions | form six Physics

How does the band theory explain electrical properties of solids?

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UNSOLVED

In an intrinsic emiconductor, the energy gap E_2, is 1.2eV, and its hole mobility is very much smaller than electron mobility which is independent of temperature. assuming that the temperature dependence of intrinsic carrier concentration , n_i is expressed as

, where n₀ and K_B are constants, T is temperature and is an energy equal to .

1. What is the ratio betweeen conductivity at 600K and that at 300K?
2. Comment on the results obtained in (i).

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UNSOLVED

Study the circuit in Figure 1 below then answer the questions that follow:

1. Determine the voltage drop across , R_B2.
2. Calculate the emitter current , I_g.
3. state the assumption taken to obtain the answer in (ii) above.

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UNSOLVED