BlogHide Resteemsemperorhassy (66)in steemstem • 4 years agoIMAGING IN PHYSICSOptical lenses, such as the lenses in a camera viewfinder, a telescope or a microscope, allow us to see the images of a wide range of objects. In these instruments, a lens (or several lenses)…emperorhassy (66)in steemstem • 4 years agoTHE LAWS OF THERMODYNAMICS: The Carnot Cycle, Diesel Engine, Refrigerators and Heat Pumps.Did you know that two isotherms and two adiabatics (the names given to the changes)can be put together to produce a closed cycle? Actually, this is called a Carnot cycle. In a closed cycle, we…emperorhassy (66)in steemstem • 4 years agoTHE LAWS OF THERMODYNAMICS: An Adiabatic Change of a Gas and The Second Law of Thermodynamics.When a gas is compressed very rapidly, there is no time for energy to leave the gas by thermal processes and go to the surroundings. But the temperature changes because work is done – temperature…emperorhassy (66)in steemstem • 4 years agoTHE LAWS OF THERMODYNAMICS: Obtaining the Lowest Temperature in the World.By this stage of physics, we will have spent a lot of time learning about properties of materials – conductors have resistance, fluids are viscous, and so on. But at very low temperatures we…emperorhassy (66)in steemstem • 4 years agoENERGY AND TEMPERATURE #2We know from everyday experience that some things need more energy than others to raise their temperatures by the same amount. For instance, it takes more energy to heat water by one kelvin than…emperorhassy (66)in steemstem • 4 years agoENERGY AND TEMPERATURELike most of my articles, this article was written only after a lot of late nights and numerous cups of coffee – usually ‘instant’ coffee! The instant coffee industry has developed into a…emperorhassy (66)in steemstem • 4 years agoAPPLICATIONS OF ELECTROMAGNETIC INDUCTION: Eddy Currents, The Dynamo, and the Behaviour of a Simple D.C Motor.The flux in the core of a transformer induces currents in the coils at right angles to it. Why doesn’t the flux induce currents in the core itself? After all, the core is made from iron or some…emperorhassy (66)in steemstem • 4 years agoElectromagnetic Induction: Its Laws and Applications.In 1831, Michael Faraday discovered electromagnetic induction, which enabled him to transfer electrical power from one circuit to another by varying the magnetic linkage. Faraday’s discovery led…emperorhassy (66)in steemstem • 4 years agoTHE PHYSICS BEHIND CHARGE AND FIELD: Electrical Potential, Capacitors and The Coulomb's Law.In using a flame probe for investigating the potential between two parallel plates, a voltmeter is used to measure the p.d. across the parallel plates. A flame probe is used to measure voltage at…emperorhassy (66)in steemstem • 4 years agoTHE PHYSICS BEHIND CHARGE AND FIELDThe spark that jumps across a gap of 5 cm or so in a Van de Graaff generator is the dramatic effect of static electricity. Less conspicuous, but the cause of many problems in microelectronic…emperorhassy (66)in steemstem • 4 years agoATOMIC NUCLEUS: Forces In The NucleusTHE ELECTRICAL FORCE: The positively charged protons exert an electrical force of repulsion on each other. The force between two protons, of equal charge +e, can be calculated from the formula:FE…emperorhassy (66)in steemstem • 4 years agoATOMIC THEORY: Activity and Half-lifeThe activity of a radioactive source is the number of ionizing particles it emits per second. Each emission corresponds to a change in the nucleus of one atom and is also called the decay rate.…emperorhassy (66)in steemstem • 4 years agoATOMIC NUCLEUS: Energy and politicsFrance produces 75 per cent of its electrical power from nuclear power stations and only 12 per cent from fossil fuels. This compares with just 28 per cent nuclear power in Britain, and 70 per…emperorhassy (66)in steemstem • 5 years agoPARTICLE PHYSICS: Deep Inelastic Scattering, Time dilation and The Higgs Boson.Deep inelastic scattering (DIS) is an extension of the scattering experiments like that of Geiger and Marsden that led to the discovery of the atomic nucleus. If the alpha particles used had had…emperorhassy (66)in steemstem • 5 years agoPARTICLE PHYSICS: Detecting Systems And Techniques For Finding Subatomic ParticlesThe most common techniques for finding the mass and charge of a particle of matter are based on the following: a charged particle moving at right angles to the direction of a magnetic field B…emperorhassy (66)in steemstem • 5 years agoPARTICLE PHYSICS: What Holds It All Together? – Forces And Exchange Particles.Newton was worried by his theory of gravity. He thought it unscientific because the force of gravity was having to act through empty space, so there was nothing to transmit the force. This worry…emperorhassy (66)in steemstem • 5 years agoPARTICLE PHYSICS: QUARKS BRING ORDER OUT OF CONFUSION.The ways described in my last post titled "The Search for Order and the Classification of Particles", for classifying particles were immensely helpful – interactions could be predicted. But like…emperorhassy (66)in steemstem • 5 years agoPARTICLE PHYSICS: The Search For Order And The Classification of Particles.This is a sequel to my last post on PARTICLE PHYSICS: Discovery of Particles and the Existence of Energy, Matter and Antimatter. In this post, I will explain the problems faced by physicists in…emperorhassy (66)in steemstem • 5 years agoPARTICLE PHYSICS: Discovery of Particles and the Existence of Energy, Matter and Antimatter.Scientists once thought that atoms were indivisible – the word ‘atom’ means ‘cannot be cut’. They looked more closely and found electrons, protons and neutrons. Again, they thought these were the…emperorhassy (66)in steemstem • 5 years agoNEWTON’S LAW AT WORK: Explanations on The Gravitational Potential, Escape Velocity and The Movement of Satellites in Orbits.The gravitational potential (V) of an object at a point in space is a useful idea. It allows us to calculate the energy changes, or the work done, when a satellite moves to a different orbit.…
