Read e-book online Advances in Physics PDF

By Alan Gladwell

ISBN-10: 9380168004

ISBN-13: 9789380168005

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4. What sort of polymer is a rubber on the end of a pencil? 5. What happens to the translucency of an amorphous polymer when it is put under stress? What is a wave? At this point in the course, it is easy to get bogged down in the complex theories and equations surrounding 'waves'. However, a better understanding of waves can be gained by going back to basics, and explaining what on Earth a wave is in the first place. Definitions A wave, at its most basic level, is a disturbance by which energy is transferred because this disturbance is a store, of sorts, of potential energy.

What sort of variable resistor would a semiconductor be useful in? 3. If positive ions are added to silicon (doping it), how does its conductivity change? Stress, Strain & the Young Modulus Stress Stress is a measure of how strong a material is. This is defined as how much pressure the material can stand without undergoing some sort of physical change. Hence, the formula for calculating stress is the same as the formula for calculating pressure: where σ = stress (in Newtons per square metre but usually Pascals, commonly abbreviated Pa), F = force (in Newtons, commonly abbreviated N) and A = the cross sectional area of the sample.

The gradient will equal the resistance. In Series Circuits In a series circuit (for example, a row of resistors connected to each other), the resistances of the resistors add up to give the total resistance. Since conductance is the reciprocal of resistance, the reciprocals of the conductances add up to give the reciprocal of the total conductance. So: ΣR = R1 + R2 + ... + Rn In Parallel Circuits In a parallel circuit, the conductances of the components on each branch add up to give the total conductance.

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Advances in Physics by Alan Gladwell


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