注目の話題: 30代。自分の老いを受け入れられない。; この誘い方って好意が見えてしまっていますか？; フリーターについて

Let's enjoy English!

No.428　13/05/05 11:42
燻し銀三 ( 50代 ♂ Oe38xe ) あ+あ-

【What is a half-life 半減期？】

In short,the thing becomes half of amount in the first half-life,and it turns into quarter of amount in the second half-life.The next is eighth,then sixteenth.It'll never disappear forever exactly.☝

《Various half-lives》

If trying to acknowledge speed of the reactions,the half-life is an index which is easy and useful to understand.😉

In a word,if a reaction of atomic nucleus is short-term,it's a speedy reaction.Contrary to it,if it's a long-term,it's a long one.😃

How long is the half-life of the reaction of the atomic nucleus concretely? It depends on.😃

The one of short-term is no more than thousandth second.On the other hand,the long one is no less than billions of years.😚

Some super uranium chemical element which is artificial is so big and unstable that it changes into other one at a time when it's created.For example,half-life of ウンウントリウム of which atomic number 113 is only 0.000034 second.😲

Contrary to it,the half-life of isotope of thorium is 14 billion years.😲