Atoms and Nucle...

A sample of radioactive element has a mass of 10 g at an instant t = 0. The approximate mass of this element inthe sample after two mean lives is

Radioactive nuclei that are injected into a patient collect at certain sites within its body, undergoing radioactive decay and emitting electromagnetic radiation. These radiations can then be recorded by a detector. This procedure provides an important diagnostic tool called

A radioactive decay chain starts from ₉₃Np²³⁷ and produces ₉₀Th²²⁹by successive emissions. The emitted particles can be

The half-life of sample of a radioactive substance is 1 hour. If 8 × 10¹⁰ atoms are present at t = 0, then thenumber of atoms decayed in the duration t = 2 hour tot = 4 hour will be

Carbon dating is best suited for determining the age of fossils if their age in years is of the order of

The half-life of radium is about 1600 years. Of 100 g of radium existing now, 25 g will remain unchanged after

The half-life of a radioactive substance is 40 years. How long will it take to reduce to one fourth of its original amount and what is the value of decay constant

The half-life of a radioactive substance is 3.6 days. How much of 20 mg of this radioactive substance will remain after 36 days

A radioactive material has a half life of 10 days. What fraction of the material would remain after 30 days