Question

what is half life??????

Answer 1

in my way half life means only happy or un happy

Answer 2

The atomic nuclei of atoms of Half Life radioactive substances continues to decay, resulting in the number of united atoms in substances continuously decreasing.

A fixed period of time in which the quantity of any radioactive substance, reduces the number of atoms, half of its initial value, is called semi-age of that substance. Display it with 'T'

For a radioactive element, the value of semi-age remains fixed, but its value varies for different radioactive elements. If a radioactive substance is semi-age of T then after T time, half the quantity of the substance, 2T times after the fourth quantity of the substance, and 3T 'after time, 1/8 of the substance remains unaltered.

$\underline{\bf \: Extra \: Information}$

Semi-age of natural radioactive substances and its isotopes can be from a few milliseconds to hundreds of millions of years. For example, the semi-age of isotopic ($\bf \: _{84}P _{0} {}^{214}$) of polonium is only $\bf \: {10}^{ - 5}$ seconds, while semi-age of uranium ( $\bf \: _{92}U {}^{238}$) is 4. 5 * 10^7 years. .