All of the sun’s photons are generated through nuclear reactions within it. If a photon is generated at the centre of the sun it can take anywhere between 2 days and 200,000 years to escape the body of the sun. That’s because the path of the photon is purely probabilisitic. At the centre of the… Continue reading How long does it take a new photon to reach us from its creation in the sun?
Ever wondered just how fast we are moving through space? Well, the Earth revolves around the Sun at around 30 km/sec, in its annual path, which takes a year to complete. The Solar System revolves around the Milky Way centre at around 230 km/sec. It takes around 225 million years to complete a single revolution.… Continue reading How fast is the Earth moving through space?
So, just the other day, I was thinking about how much energy we need to destroy hair follicle and blood vessels. Typically we talk about 1 or 2 joules per pulse. Then I thought, what is 1 joule of energy? I had no idea what this actually meant in the ‘real’ world! So, I… Continue reading How much energy does it take to heat a cup of coffee or tea?