注目の話題: 🔥理沙の夫婦生活奮闘日記😤パート3️⃣💥; バージンロードを1人で歩いてはいけないのでしょうか。; 不倫して心入れ替えたパートナーっています？

Let's enjoy English!

No.446　13/05/15 01:55
燻し銀三 ( 50代 ♂ Oe38xe ) あ+あ-

【Let's measure an age with the half-life】

《Photosynthesis 光合成 and stopping its activity》

The vegetation photosynthesizes as long as it's alive.It absorbs carbon dioxide from the air and,water in the ground.It makes use of an energy from the sun,and generates carbon monoxide 一酸化炭素.🌱

Carbon is a mixture of isotopes,and contains C14 which is isotope of the carbon to some extent.😃

Its proportion is same in regard to the carbon dioxide,so the proportion of the isotope of the carbon,C14,in a living vegetation is same as the one in the air.😃

Let's suppose that a tree was cut down.Then it stops photosynthesizing.In short,supply of new C14 from the air decreases as the ages pass.When 5730 years which is the half-life of the C14,pass,its amount of energy becomes half.

《Measurement of an age》

In a word,if density of the C14 in the air around the wooden sculpture is half,it means that the wood which was used for the sculpture was cut down 5730 years ago.🍀