An element will undergo decay if: The concept of radioactive decay was first discovered in 1896 by Henri Becquerel as he was working the element uranium compounds.In his first experiment, he placed the uranium on top of photographic film wrapped in dark paper and placed the crystals in the sunlight.The half-life of a catalog is the day when half of the consumer responses to the mailing have been received.Sears Canada studied the history of their sales data and found that their catalogs reached their half-life 20 days after being mailed, although the life of the catalog was actually several months.
Nuclear radiation can be both extremely beneficial and extremely dangerous. X-ray machines, some types of sterilization equipment and nuclear power plants all use nuclear radiation -- but so do nuclear weapons.
The online Half Life Calculator is used to calculate the half-life in exponential decay.
Half-life is the period of time it takes for a substance undergoing decay to decrease by half.
Meteorites are among the oldest objects we know about - formed about 4.5 billion years ago. This article describes the principles and methods used to make that determination.
There are well-known methods of finding the ages of some natural objects.