Respond to this Question
Similar Questions

Nuclear physics
1)7Be decays with a halflife of about 53 d. It is produced in the upper atmosphere, and filters down onto the Earth's surface. If a plant leaf is detected to have 300 decays/s of 7Be, how many days do we have to wait for the
asked by Sandhya on April 16, 2008 
Science
Radium has a halflife of 1620 years and decays into radon, which has a halflife of 3.82 days. A 10gm source of radium is sealed, and the radon produced is pumped off every 24 hours. How many mill curies of radon are pumped off
asked by Nivia on September 30, 2012 
chemistry
If there are 80 milligrams of a radioactive element decays to 10 milligrams in 30 minutes then what is the elements half life in minutes? Ok i narrowed it down to either 10 or 30...but im rly confused so if u could help it wuld be
asked by jojo on March 4, 2007 
PRe calc story problem!!
A radioactive element decays exponentially according to the function Q(t) = Q0ekt .If 100 mg of the element decays to 25 mg in 12 days, find the halflife of the element.
asked by Rania on March 10, 2017 
pre calc
A radioactive element decays exponentially according to the function Q(t) = Q0ekt .If 100 mg of the element decays to 25 mg in 12 days, find the halflife of the element. please help
asked by Rania on March 10, 2017 
math with application
If 12 % of a radioactive substance decays in 7 hours, what is the halflife of the substance? Carry out all calculations exactly, then round the final answer to three decimal places. The half life is what hours?
asked by liv on October 16, 2015 
advanced math
What is the half life of a substance if it decays by 75% in two weeks?
asked by katelyn on November 9, 2011 
calculus
The rate at which an amount of a radioactive substance decays is modeled by the differential equation dA/dt = kA, where A is the mass in grams, t is the time in years, and k is a constant. Answer the following. a) If a 100gram
asked by ronnieday on March 19, 2012 
chemistry
What is the halflife of an isotope if it decays to 12.5% of its radioactivity in 18 minutes?
asked by fatin on September 14, 2010 
physics
7/8 part of a substance decays in 45 days what is its half life
asked by abi on February 5, 2014