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Q1. What is the difference between voltage current characteristics for intrinsic and extrinsic semiconductor in both forward in addition to reverse direction?

Q2. Assume the Sun is mostly composed of hydrogen atoms. Suppose the mass of the Sun is 1.58 × 10^30 kg and the mass of a hydrogen atom is 1.672 × 10-27 kg. How many atoms are there in the Sun? Answer in units of atoms.

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