Note that after one half-life there are not exactly one-half of the atoms remaining, only approximately, because of the random variation in the process. ДЇor example, the image on the right is a simulation of many identical atoms undergoing radioactive decay. In other words, the probability of a radioactive atom decaying within its half-life is 50%. Instead, the half-life is defined in terms of probability: 'Half-life is the time required for exactly half of the entities to decay on average'. For example, if there is just one radioactive atom, and its half-life is one second, there will not be 'half of an atom' left after one second. In that case, it does not work to use the definition that states 'half-life is the time required for exactly half of the entities to decay'. Note the consequence of the law of large numbers: with more atoms, the overall decay is more regular and more predictable.ДЄ half-life usually describes the decay of discrete entities, such as radioactive atoms. The number at the top is how many half-lives have elapsed. Simulation of many identical atoms undergoing radioactive decay, starting with either 4 atoms per box (left) or 400 (right). The accompanying table shows the reduction of a quantity as a function of the number of half-lives elapsed. Half-life is constant over the lifetime of an exponentially decaying quantity, and it is a characteristic unit for the exponential decay equation. Rutherford applied the principle of a radioactive element's half-life to studies of age determination of rocks by measuring the decay period of radium to lead-206. The original term, half-life period, dating to Ernest Rutherford's discovery of the principle in 1907, was shortened to half-life in the early 1950s. The converse of half-life is doubling time. For example, the medical sciences refer to the biological half-life of drugs and other chemicals in the human body. The term is also used more generally to characterize any type of exponential or non-exponential decay. The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay or how long stable atoms survive. Oh, and please tell as many people as possible, including tweeting, FB updates, Messages in bottles, carrier pigeons, smoke signals and graffiti.Half-life (symbol t 1вЃ„2) is the time required for a quantity to reduce to half of its initial value. Winner will receive a $5 Steam game or something else if anybody wants to donate a prize.ДЄs always, if you have any questions, just ask.

Send you entries to me directly, or host them somewhere and send me the link or post the link as a comment on my site (remember, all comments with links are held in a queue - please do not try to subvert that process). No entries for other games, including Portal and Portal 2 will be considered.Д¬losing date for entries is 10:00 AM GMT Monday 19th May 2014 -that's about 3 weeks. Half-Life, Opposing Force, Blue Shift, Half-Life 2, Lost Coast, HL2: Episode One and HL2: Episode Two. They must be from any Half-Life game, i.e. Please make your images as big as possible in terms of dimensions, as that gives me more possibilities for using them on the site.

I will try and create a page with all the entries, but again, I don't guarantee it. Viewers to my recent Twitch broadcast may have seen the one I created as the pre-stream image and I created an Episode Two one but I can't find it now.Д®ntrants must create an imaginative and subtle image that I will try and use in various places around the site, although I make no guarantee of that. Check out FastcoDesign and Hongkiat for more examples. There has been a resurgence in animated GIFs (the proper name is cinemagraphs recently after some very artistic ones were created. As a sort of gap-filler between my RavenholmVille and the next mapping competition, I have decided to run a little Animated GIF competition.

Half life 2 gifs