The half like of silicon-32 is 70 years. If 30 grams is present now, how much will be present in 900 years?

Question

The half life of silicon-32 is 710 years. If 30 grams is present now, how much will be present in 900 years

 

Answer 1

Not sure if it's 70 years or 710 years - your question lists both.  I've provided the answer for 710 years.  If it's 70 years, replace the 710 with 70.

 

A(t) = A₀*(1/2)^t/710    where:

• A(t) = the amount left in t years
• A₀ = the initial amount = 30 g
• t = years = 900

 

A(900) = (30 g)*(1/2)^900/710

 

Use your calculator to compute the answer