Question

The half life of radium-226 is 1600 years. How many grams of a 0.25g sample will remain

Answer 1

Answer:

Explanation:

half life = 1600 years .

m = M  x $( \frac{1}{2} )^n$

m is mass of the radioactive object after n half lives , M is original mass.

n = 4800 / 1600

= 4

Putting the valus of n and M we have

m = .25 x $( \frac{1}{2} )^3$

= .03125 g .