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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: Judy on April 27, 2021, 11:29:17 PM

Title: How long does a radioactive material take to decay to 2% of its original?
Post by: Judy on April 27, 2021, 11:29:17 PM

Assuming that the half-life of a radioactive element is 5.2 years, how long does it take when this radioactive material decays to 2% of its original amount?
 
The answer is  B (see attachtment)

Here's my calculation:
log(2/100) / log(1/2) *5.2
None of the answer leads to this.

Title: Re: How long does a radioactive material take to decay to 2% of its original?
Post by: Borek on April 29, 2021, 03:03:39 AM

Not sure what the problem is, B and you answer seem to be equivalent.