Author Archives: mrmackenzie

higher assignment⤴

from @ fizzics

Your assignment will be based on an optoelectronics topic.  You will get some ideas for practical work by downloading this booklet. I have attached a copy of the Scholar notes for unit 3 of the CfE Higher course.  You will find background physics with appropriate energy band explanations on pages 103-142. Don’t print this document, ... Read more

particle accelerators⤴

from @ fizzics

An electric field can be used to accelerate charged particles. Conservation of energy tells us that work done by the electric field = change in the particle’s kinetic energy The speed of the particle can be determined if its charge and the accelerating voltage (potential difference) are known.  The notes attached to the end of this post ... Read more

quarks, leptons and antimatter⤴

from @ fizzics

At the end of Our Dynamic Universe, we considered big things like stars, galaxies and the Universe itself.  Now the Particles and Waves unit brings us to particles so small we need groups of them just to make a single atom.  Is there a connection? Why do we study particles? from mr mackenzie on Vimeo.  The Standard Model An elementary ... Read more

pp chain reaction in stars⤴

from @ fizzics

Twinkle, twinkle little star, How I wonder what you are. Giant thermonuclear reaction; Held by gravitational attraction. Twinkle, twinkle little star, You look so small ’cause you’re so far. As you burn through constant fusion, Your twinkle’s just an optical illusion. That happens when your light gets near; distorted by our atmosphere. Twinkle, twinkle little ... Read more

AH: the Hertzsprung Russell diagram⤴

from @ fizzics

Our Sun is a typical yellow star, so its emission would be represented by the middle star in this image. image courtesy of kstars, kde.org – colour is exaggerated The colour of a star also tells us something about the expected behaviour of a star, it’s lifetime, and destiny. This is achieved by plotting stars ... Read more