Ask a New Question

Question

The radioactive element polonium decays according to the law given below where Q0 is the initial amount and the time t is measured in days.
Q(t) = Q0 ยท 2-(t/140)
If the amount of polonium left after 700 days is 45 mg, what was the initial amount present?
mg
12 years ago

Answers

Steve
Q0 2^-(700/140) = 45

Note that 700 days is 5 half-lives
So, 1/32 of Q0 is left

Q0 = 32*45 = 1440
12 years ago

Related Questions

A certain radioactive element has a half life of 1 h. If you start with a 1-g sample of the element... The radioactive element has a half-life of about 28 years and sometimes contaminates the soil. After... A certain radioactive element has a half liv of 20days, how long does it take 3/2 of the atom origin... A radioactive element x has half life of 30 days and will decay to become another new element Y..... How a radioactive element will decay over time? a certain radioactive element has a half life of 31.2 years. in how many years will contamination re... If 50% of a radioactive element remains after 4000 years, what is the half-life? a 1 half-life... If 50% of a radioactive element remains after 4000 years, what is the half-life? 1,2,3, or 4 half-li... If a radioactive element has a half life of 4 hours, then x grams of the element dwindles to x/2 gra...
Ask a New Question
Archives Contact Us Privacy Policy Terms of Use