Atoms and Nucle...

The rate of disintegration of fixed quantity of a radioactive element can be increased by

The half life (T) and the disintegration constant (λ) of a radioactive substance are related as

Radon (Rn) decays int o Polonium (Po) by emitting an α– particle with half-life of 4 days. A sample contains 6.4 × 10¹⁰ atoms of Rn. After 12 days, the number ofatoms of Rn left in the sample will be

Decay constant of radium is λ. By a suitable process its compound radium bromide is obtained. The decay constant of radium bromide will be

In the uranium radioactive series, the initial nucleus is ₉₂U²³⁸ and the final nucleus is ₈₂Pb²⁰⁶. When theuranium nucleus decays to lead, the number of α– particles emitted will be

The decay constant of a radio isotope is λ. If A₁ and A₂ are its activities at times t₁ and t₂ respectively, the number of nuclei which have decayed during the time(t₁–t₂)

Which of the following is a correct statement?

Half lives of two radioactive substances A and B are respectively 20 minutes and 40 minutes. Initially the sample of A and B have equal number of nuclei. After 80 minutes, the ratio of remaining number of A and B nuclei is

A nucleus _nX^m emits one α and one β particles. The resulting nucleus is

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