## Question

A radioactive sulestance has a half–life of four months three fourth of thesulestance will decay in

### Solution

Eight months

#### SIMILAR QUESTIONS

When a deuteron of mass 2.0141 *u* and negligible kinetic energy is absorbed by a lithium nucleus of mass 6.0155 *u*, the compound nucleus disintegrates spontaneously into two alpha particles, each of mass 4.0026 *u*. Calculate the energy in joule carried by each alpha particle.

If the half lives of a radioactive element for α and β decay are 4 yrs and 12 yrs respectively, the ratio of their activities after six yrs will be

Half life of a radioactive sulistance A is 4 days. The probability that a nucleus will dacay in two half lives is

The half life of The time taken for the radioactivity of a sample of to dacay to 1/6 th of its initial value is:

The half life of ^{131}I is 8 days. Give a sample of ^{131}I at time t = o, we can assert that

The mass of one mole of electrons is

The increasing order for the values of e/m is

The total number of neutrons in dipositive zinc ion with mass number 70 is

A radioactive nucleus is leing produed at a constant rate ∝ per second. Its decay constant is λ. If N_{o}. are the number of nuclei at time *t* = 0, then themanimum no, of nuclei

Half life of radium is 1600 yrs. Its average life is