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Free electrons and positive holes exist in pairs. But holes can only move by the movement of valence electrons, not free electrons

What did people say for 5, the MCQ about undoped silicon? Pretty sure the answer must have been D, the one that says equal numbers of positive holes and electrons move in opposite directions, but I said A, that more electrons move than positive holes, because there are both free electrons and...

Sorry, forgot to say: the model answer is that the assumption in X is that g is constant (which I understand) and the assumption in Y is that g changes with height. This doesn't seem to make sense however since Y doesn't even include g as a constant or variable, the only thing's it assumes are...

I don't really understand the answer to this question (26 a) from the 2015 Physics HSC. It reads as follows: Consider the following two models used to calculate the work done when a 300 kg satellite is taken from Earth's surface to an altitude of 200 km. You may assume that the calculations are...