Price to Earnings Ratio: Arriving at a price to earnings ratio is not easy. There are a lot of factors that play into what the public is willing to pay for the earnings of a company. Those of us who have seen the prototypes know that this product could be insanely popular. ( I think it could make 50% of televisions & computer screens obsolete.
Half-life is defined as the time it takes for one half of a radioactive element to decay into a daughter isotope. As radioactive isotopes of elements decay, they lose their radio activity and become a brand new element known as a daughter isotope.
In particular then, the half life of a radioactive element is the time required for half of it to decay (i.e. change into another element, called the daughter element). So if a radioactive element has a half life of one hour, this means that half of it will decay in one hour.