Semiconductor – is a material whose resistivity is between that of a good conductor and a good insulator. Intrinsic Conduction – is the movement of charges through a pure semiconductor. Extrinsic Conduction – is the movement of charges through a doped semiconductor. Doping – is the addition of a small… Continue Reading →
Ionisation – occurs when an atom loses electrons. Thermionic Emission – is the giving off of electrons from the surface of a hot metal. Photoelectric Effect – is the emission of electrons from a metal due to light of a suitable frequency falling upon it. Photon – is a discrete… Continue Reading →
Displacement – is distance in a given direction. Speed – is the rate of change of distance with respect to time. Velocity – is the rate of change of Displacement with respect to time. Acceleration – is the rate of change of Velocity with respect to time. Scalar Quantity –… Continue Reading →
Temperature – of an object is a measure of the hotness or coldness of that object. Thermometric Property – is any physical property that changes measurably with temperature. Specific Heat Capacity – of a substance is the heat energy needed to change one kilogram of the substance by one Kelvin…. Continue Reading →
Real Image – is an image formed by the actual intersection of light rays. Virtual Image – is formed by the apparent intersection of light rays. Refraction – is the bending of light as it passes from one medium to another. The Refractive Index of a Medium – is the… Continue Reading →
Just how small are atoms? And what’s inside them? The answers turn out to be astounding, even for those who think they know. This fast-paced animation uses spectacular metaphors (imagine a blueberry the size of a football stadium!) to give a visceral sense of the building blocks that make our… Continue Reading →
Coulomb’s Law – states that the force between two point charges is proportional to the product of the charges and inversely proportional to the square of the distance between them. Electric Field Strength (E) – is the force per unit charge. Potential Difference (p.d.) – between two point is the… Continue Reading →
Coulomb – the unit of electric charge Insulator – a substance in which electricity does not flow Conductor – a substance in which electricity flows All static charge lies on the – outside of a conductor Static charge on a conductor accumulates – where the conductor is more pointed Coulomb’s… Continue Reading →
v = u + at – velocity ma – Force Fd – Torque mv – Momentum (p) ½mv² – Kinetic Energy mgh – Potential Energy Fs – Work W/t – Power kx – Force of Spring 1/f – Period (f=frequency) Gmm/r² – Force of gravity between two masses E/q –… Continue Reading →
Light Refraction is the bending of light as it goes from one medium to another. Laws of Refraction: (1) Incident ray, refracted ray & normal are on the same plane. (2) Sine I/Sine R is constant. Refractive Index: Sine I/Sine R = 1/Sin C = Real depth/Apparent depth = c1/c2 Critical Angle: The… Continue Reading →
