A radioactive element emits 200 particles per second. After three hour – McqOptions

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1.	A radioactive element emits 200 particles per second. After three hours 25 particles per second are emitted. The half-life period of element will be
A.	50 minutes
B.	60 minutes
C.	70 minutes
D.	80 minutes
Answer» C. 70 minutes

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