SOLUTION: The half-life of radium is 1690 years. If 40 grams are present now, how much will be present in 400 years.

Question 364288: The half-life of radium is 1690 years. If 40 grams are present now, how much will be present in 400 years.
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
The half-life of radium is 1690 years.
If 40 grams are present now, how much will be present in 400 years.
:
The half-life formula: A = Ao*2^(-t/h)
where
A = resulting amt after t yrs
Ao = initial amt
h = half-life of substance
t = time
:
We want to find A:
A= 40*2^(-400/1690)
enter on a calc
A = 33.9477 grams after 400 yrs
:
:

RELATED QUESTIONS
the half life of radium is 1690 years if 40 grams are present now how much will be... (answered by ewatrrr)

The half-life of radium is 1690 years. If 60 grams are present now, how much will be... (answered by stanbon)

the half life of radium is 1690 years. if 60 grams are present now, how much will be... (answered by josgarithmetic)

the half life of radium is 1690 years. if 70 grams are present now, how much will be... (answered by stanbon)

Question Help The half-life of radium is 1690 years. If 80 grams are present... (answered by ankor@dixie-net.com)

The half-life of radium is 1690 years. If 60 grams are present now, how much will... (answered by josgarithmetic)

The half-life of radium is 1690 years. If 70 grams are present now, how much will... (answered by ikleyn)

The half-life of radium is 1690 years. If 40 grams are present now, how... (answered by josgarithmetic)