The mass of a radioactive element decays at the rate by m(t)=m0e^-rt , where m(t) is the mass at any time t , m0 is the initial mass , and R is the rate of decay .
Uranium -240 has a rate of decay of .0491593745 , what is the mass of u-240 left after 10 hours , if the initial mass is 50 grams ?
A) 28.54387g
B ) 30.58254g
C) 32.14286 g
D ) 32 . 68034 g

Question

The mass of a radioactive element decays at the rate by m(t)=m0e^-rt , where m(t) is the mass at any time t , m0 is the initial mass , and R is the rate of decay . 
Uranium -240 has a rate of decay of .0491593745 , what is the mass of u-240 left after 10 hours , if the initial mass is 50 grams ? 
A) 28.54387g
B ) 30.58254g
C) 32.14286 g
D ) 32 . 68034 g

freckles · Answer

you just plug in all the info given to you in the that equation $$m=m_0e^{-rt}$$
then find the mass m

freckles · Answer

m0 is the initial that is given in your question (your last line)
r is the rate of decay that is given in the second to last line
and we want to know m when t is 10 hours

anonymous · Answer

Which will get the answer of what ?