Wednesday
July 23, 2014

Homework Help: college algebra

Posted by Dee on Sunday, November 17, 2013 at 4:10pm.

An isotope of lead, 201Pb, has a half-life of 8.4 hours. How many hours ago was there 40% more of the substance? (Round your answer to one decimal place.)


____hr

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

college algebra - Use a calculator to help solve the problem. An isotope of lead...
College Algebra - Use a calculator to help solve the problem. One isotope of ...
Half-life - After two hours, 1/16 of the initial amount of a radioactive isotope...
college - a certain radioactive isotope has a half life or 850 years.how many ...
Chemistry - Gallium65, a radioactive isotope of gallium, decays by first order-...
Chemistry - I've figured out most of it. I'm not sure how to find the percentage...
chemistry - It takes 1 hour and 17 min. for a 1.000g sample of a certain isotope...
Science chemistry - It takes 1 hour and 17 min. for a 1.000gsample of a certain ...
College Geology - assume that a particular radioactive-isotope has a half-life ...
chemistry - A radioactive sample contains 2.45g of an isotope wiht a half life ...

Search
Members