Potassium argon dating is useful for determining the age of
The formula for determining the age is as follows -Where N is the final weight of the radioactive substance with in the continental crust.is the initial weight of the radioactive substance with in the continental crust.This isotope, after its half-life, decays into argon gas (Ar-40).The comparison of the amount of the isotopes K-40 to Ar-40 gives the information about the time period the rock has formed.According to geologists the age of rocks dates back to 4 billion years.These facts are based on the radioactive isotopes of potassium (K-40).K is the rate constant and t is the Hence option A is correct Answer: The correct answer is A.
Working out how old archaeological remains are is a vital part of archaeology.
It is most useful for minerals older than 100,000 years and can reach way back into the geological past.
The measurement is based on an isotope of potassium that radioactively decays at a known rate into argon.
Thermoluminescence is a similar technique to optical dating, but uses heat instead of light to stimulate the minerals.
The method also assumes a 'zeroing' event in the life of the material, when it was either last heated or exposed to sunlight.
K-Ar dating has been used to date lava flows above and below archaeological deposits that contain important hominid fossils in Africa's Olduvai Gorge.