• #### Young's Dpuble Slit Experiment

with two other slits as shown below, then the two slits b and c will act as point sources of light. Such an arrangement is Young's double slit experiment. Light from these two sources will be coherent and monochromatic and an interference pattern will...

https://astarmathsandphysics.com/ib-physics-notes/waves-and-oscillations/1504-young-s-dpuble-slit-experiment.html
• #### The Diffraction Grating

The diffraction grating is Young's double slit writ large. Young's double slit has two slits, and the diffraction grating has many slits, each separated by the same distance. Additional slits with a constant separation will not affect the condition for...

https://astarmathsandphysics.com/ib-physics-notes/optics-and-light/1411-the-diffraction-grating.html
• #### The Maths of Youngs's Double Slit Experiment

Young's double slit experiment, along with the pattern formed on a screen, is illustrated below. We can derive an expression for the distance between successive slits in two different ways. Both use the fact that for a bright fringe, constructive...

https://astarmathsandphysics.com/ib-physics-notes/waves-and-oscillations/1502-the-maths-of-youngs-s-double-slit-experiment.html
• #### Young's Double Slit Experiment

This experiment was very important in demonstrating the wave nature of light. It is very simple, consisting only of a light source and two screens, one with two slits. Light passes through each slit, and the light that passes through each slit...

https://astarmathsandphysics.com/o-level-physics-notes/300-young-s-double-slit-experiment.html
• #### Noise

earphones or earplugs. In the UK, the maximum noise level is 90 dB over an eight hour day, or 100 dB for 48 minutes. Many young people expose themselves to much louder levels of music at parties andf discos. If your environment is loud enough for you to...

https://astarmathsandphysics.com/gcse-physics-notes/786-noise.html
• #### Sensory Hearing Loss

Sensory hearing loss can be caused by aging or by exposure to excessive noise over long periods of time. This can happen to young people who play loud music all day and night, or to people who work with loud machinery. Young people can avoid it by...

https://astarmathsandphysics.com/ib-physics-notes/biomedical-physics/1253-sensory-hearing-loss.html
• #### The Two Source Interference Pattern

radiating from halfway between the sources. The same pattern of maximum and minimum intensity is produced by light (Young's double slit experiment) and water waves, though for light it is best observed by displaying the pattern on a screen, producing an...

https://astarmathsandphysics.com/ib-physics-notes/waves-and-oscillations/1492-the-two-source-interference-pattern.html
• #### A Level Physics Notes

https://astarmathsandphysics.com/a-level-physics-notes.html
• #### The Late Heavy Bombardment

about 4.6billion years ago, which is assumed to be the time when the first solids formed in theprotoplanetary diskaround the young Sun. Later calculations showed that the rate of collapse and cooling was dependent on the size of the body, and applying...

https://astarmathsandphysics.com/university-physics-notes/planetary-science/1513-the-late-heavy-bombardment.html
• #### Einstein's Model of Light

The question of whether light was a particle or a wave is an old one. Newton thought light was made up of particles, Young that it was made up of waves. The argument seemed to be settled in favour of the wave theory until the photoelectric effect and...

https://astarmathsandphysics.com/ib-physics-notes/quantum-and-nuclear-physics/1423-einstein-s-model-of-light.html
• #### De Broglie and Matter Waves

For a long time it was argued over whether light had a wave or particle nature. Thomas Young seemed to have settled the argument in favour of the wave nature of light, until observations of the photoelectric effect showed conclusively that light also...

https://astarmathsandphysics.com/ib-physics-notes/the-history-and-development-of-physics/1305-de-broglie-and-matter-waves.html
• #### Types of Galaxy

solar masses and similarly for luminosity. Irregular galaxies tend to have a lot of gas and dust and a high proportion of young stars. The above list is not exhaustive. There are a group which do not fall into any group – maybe because they are two...

https://astarmathsandphysics.com/ib-physics-notes/astrophysics/1210-types-of-galaxy.html
• #### The Cosmic Microwave Background Radiation

associated with any single source. The early Universe was very dense and hot, and rapidly expanding and cooling. While very young radiation could not travel through it, because any photon would be repeatedly absorbed and re – emitted. There came a point...