Most of the energy we use to power technology come from finite sources which are not sustainable. This energy which may be in the form of either fossil fuels, coal or even nuclear fuels and so on will eventually be used up. However renewable sources such as solar power will not run out…..until the sun runs out of hydrogen fuel but that’s another story.
We are able to harness the light energy radiated by the sun by the used of solar cells. A solar cell is an electronic device made of semiconductors which exhibit the photovoltaic effect to convert light energy into electrical energy. Semiconductors are materials which lie between conductors and insulators. A conductor is a material which is composed of atoms in which electrons are easily freed from the nuclei. Even though it is able to form a current, it remains electronically neutral as there are the same number of positive protons and negative free electrons. An insulator, on the other hand, is a material which is composed of atoms which hold more tightly onto their electrons so they have no free electrons like conductors. Current is a measure of the rate of flow of charge through a material, with the electrons being the charge carriers transporting energy across a circuit. Continue reading →
Light is weird. Light or Electromagnetic Waves are well, waves. They are a result of a changing oscillating electric field and a magnetic field. Sometimes we call them Photons, massless high-speed subatomic particles, coming in packets called Quanta. Wave-particle duality is only the brief introduction of the enormous and extraordinary area within Physics called Quantum Theory.
A slinky is a nice little demonstration of how light travels. Light is a transverse wave so it vibrates perpendicular to the direction of energy travel. In Third Year of High School, my Physics teacher used a slinky as an example to illustrate this feature of a transverse wave and also the other, longitudinal wave, which is a wave in which its vibrations are parallel to the direction of travel. Two people held the slinky at the two ends and one begins to vibrate the slinky coils left to right.
So, I’m sure many of us have seen the advertisement packaging for supposedly healthy drinks. One of most popularised is vitamin C. I don’t know about you but when I was growing up, I associated vitamin C with oranges and how they prevent scurvy (as told by parents to ensure I was receiving my 5 a day). So what makes this chemical so important?
Well, it turns out, Vitamin C is a vitamin (duh) which is able to dissolve in water and has the chemical formula of C6 H8 O6. The molecular structure of vitamin C is seen in the diagram below: Continue reading →
As you can probably infer from the title of this thoughts post, I was recently notified that I had made a successful application to the Scottish Space School programme. To be accepted onto the programme has been a dream of mine for the past two years as a former student from my school described her intriguing experience.
The Scottish Space School programme is designed for students into Science and currently progressing through the second last year of high school.It is a week-long Space-themed residential at the University of Strathclyde and features a set of lectures given by leading researchers, laboratory activities and workshops supported by NASA astronauts and engineers. On top of that, at the end of the week, 10 students are selected to go visit NASA’s Johnson Space Centre in Houston, Texas.
I am incredibly excited and grateful to have been offered a place and hopefully on the programme I’m able to meet a bunch of like-minded people who are as fascinated about the cosmos as me!