Category: Physics A2

Physics G495 Advance Notice Article June 2013 Help

Anyone who takes Physics A2 OCR will know that although the topics you learn about are a big contribution to the final mark of the G495 exam (where you can find the revision notes here), they only account for 60% of all the marks. The last 40% comes …

A Positron Emission Tomography

Brain activity causes an increase blood flow to certain areas of the brain. The oxygen carried by the flood to the brain is labelled with a small amount of radioactive isotope oxygen-15. This has a short half life decaying by emitting antimatter called a positron. The positron emitted …

How Conservations Laws Led To The Discovery Of The Neutrino

The conservation law in fundamental particles of matter is the idea that which every decay of a nucleus, the charge, energy, lepton number and nucleon number is always conserved (a bit like momentum). With alpha decay, the energy, lepton number and charge stays the same before the decay and after …

Movement Of Heat In Physics

Heat flow occurs from a hotter substance to a cooler substance. For example, a metal at 400°C is placed into water of temperature 60°C. The heat will flow from 400°C-60°C. The greater the temperature difference between hot and cold, the greater rate of heat flow. The First Law Of …

Specific Heat Capacity and Latent Heat Experiments In Physics

The following experiment measures the specific heat capacity of a block of metal. Method Before you start the experiment, you will need the equipment for the experiment. You will need: 12V battery pack. 5 wires (two black and three red preferably). Ammeter. Voltmeter. Metal block (copper in our case). Immersion …

Chapter 13 and 14 Physics A2 OCR Revision

When looking at the macroscopic world and gases, we need to have macroscopic properties to measure the gases with. This can be: Volume, V. Mass, m. Density, p (rho). Temperature, T. Pressure, p. Pressure vs Volume To perform an experiment of pressure vs volume, we need to make …

3 Sources Of Evidence Towards The Big Bang

The Big Bang theory suggests the the Universe originated in a very hot and very dense state from which it has expanded and cooled. Red Shift Red shift of light from distance galaxies is evidence that the universe is expanding because: Light from all galaxies is red shifted …

Hubble’s Law, Constant and the Expanding Universe

The Hubble Constant is the ratio of speed of recession of a galaxy due to the expansion of the universe. The problem with measuring the Hubble Constant is that it is extremely difficult to get an accurate number (there are lots of variables we cannot control that will …

Light Clocks And Time Dilation

The explanation of how we get to the equation γ = 1 / √1-v²/c² is through a diagram where light bounces back and forth between two mirrors. While the light is bouncing back and forth, a clock is ticking. The distance can be worked out through distance = speed x …