Rb-87 Half Life Calculation: 478 Bq/g

[Umang]

Homework Statement

Specific Activity of a sample of rubidium chloride is 478 Bq per gram
knowing that activity is coming from Rb-87, calculate the half life of radioisotope

- Molar mass of the RbCl natural is 120.9256 gram
- Isotope composition of natural Rb is 72.15% and 27.85% respectively for Rb -85 and Rb-87.

Homework Equations

Calculate Half life of radioisotope from mixture.

The Attempt at a Solution

First find the number of Rb-87 atoms in solution.
Find the decay constant
so we can get half life.
is this process is correct?

 

[drvrm]

First find the number of Rb-87 atoms in solution.
Find the decay constant
so we can get half life.
is this process is correct?

how one will calculate the decay constant...pl.show some work done ...as its a homework exercise.
One becquerel is defined as the activity of a quantity of radioactive material in which one nucleus decays per second. The becquerel is therefore equivalent to an inverse second, s−1.