Question 9 The radioactivity of a 99mTc sample is measured 94 mCi at 5:00 PM. What time was it prepared if the initial activity was 200 mCi? The half life of 99mTc is 6 hours. O 10:35 PM O 10:28 AM O 2:10 PM O 4:52 PM O 12:56 PM Question 10 The radioactivity of a sample of sodium (24Na) is reduced from 880 mCi to 420 mCi in 16 years. Calculate the decay constant. O 0.046 year1 O 11.835 year1 O 28.750 year1 O 21.631 year O 0.020 year1

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Writing and Balancing Nuclear Equations

A nuclear equation is a symbolic representation of a nuclear reaction using certain symbols. It is studied in nuclear chemistry and nuclear physics.