# The half-life of radium is 1590 year. If 10 grams is present now, how much will be present in 50 years?

##### 1 Answer

Jan 13, 2017

#### Explanation:

The decay equation is

where

Given #m_0/2=10 ahen t = 1590,

m_0=20 and

At t = 1590+50=1640,