Question

An unknown radioactive element decays into non-radioactive substances. In 740 days the radioactivity of

sample decreases by 62 percent.
(a) What is the half-life of the element?
half-life:
(days)
(b) How long will it take for a sample of 100 mg to decay to 67 mg?
time needed:
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(days)

Answer 1

AnaThe half life equation is P(t) = P (0) . (0.5) t/HP(t) is the quantity at time t (proportional to the radioactivity), P(0) the quantity at time zero, ...

Missing: 62 ‎67

Explanation: