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Atomic and Nuclear Physics — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsAtomic and Nuclear Physics1 Mark
Question
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
       
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Answer

(b) 60 minutes

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