[SOLVED] A radoactive substance
Homework Statement
A radioactive substance has an activity of 10mCi. After 4 hours the activity is 6mCi.
a) What is the decay constant and the half life?
b) How many atoms are there in the beginning?
c) What is the activity after 30 hours?
Homework...
[SOLVED] Nuclear fission and amount of U-235 used
Homework Statement
At the fission of a U-235 atom about 200 MeV of energy is released. How many fissions occur in 1 second in an power plant which has the heat energy capacity of 2050 MW? How much U-235 is consumed in one year (330 days)...