DN
A radioactive substance of mass N gram decays at the rate of -KN , where k is a
dt
...
Mathematics, 12.02.2022 14:00 mallorywoods8
DN
A radioactive substance of mass N gram decays at the rate of -KN , where k is a
dt
constant. Initially the amount of the substance was 80 gram. After 100 years it decayed to
20 gram
(a) Express N in terms of the elapsed time t.
(b) Calculate the amount of the substance remains after 120 years,
Answers: 2
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