Question

If a 125 gms of radioactive element has a half life of 60 min how many half lives will it go through to become 3.90625 gms

Answer 1

Answer:

• 5

Explanation:

Let the number of half lives be x

Solve this equation to find the value of x:

• 125*(1/2)ˣ = 3.90625
• (0.5)ˣ = 3.90625 / 125
• (0.5)ˣ = 0.03125
• log (0.5)ˣ  = log 0.03125
• x =  log 0.03125 / log 0.5
• x = 5