Atoms and Nucle...

If the radioactive decay constant of radium is 1.07 × 10^–4 per year, than its half life period is approximately equal to

Carbon–14 decays with half-life of about 5,800 years. In a sample of bone, the ratio of carbon–14 to carbon –2 is found to be 1/4 of what it is in free air. This bone may belong to a period about x centuries ago, where x is nearest to

Age of a tree is determined using radio-isotope of

An atom of mass number 15 and atomic number 7 captures an α - particle and then emits a proton. The mass number and atomic number of the resulting product will respectively be

When ₃Li⁷ nuclei are bombarded by protons, and the resultant nuclei are ₄Be⁸, the emitted particles will be

If half life of a radioactive element is 3 hours, after 9 hours its activity becomes

A radioactive sample with a half life of 1 month has the label \"Activity =2 micro curies on 1.8.1991.\" What will be its activity two months later

An element A decays into element C by a two step process:
A → B + ₂He⁴; B → C + 2e^– Then

At any instant the ratio of the amount of radioactive substances is 2 : 1. if their half lives be respectively 12 and 16 hours, then after two days, what will be the ratio of the substances

Which of the following isotopes is used for the treatment of cancer