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PhysicsModern PhysicsRadioactivityMedium2 minQB

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The half life period of a radioactive element is 10 days. Then how long does it take for 90% of a given mass of this element to disintegrate

Answer:

Solution:

90% disintegrated means 10% left:

$0.10 = 2^{- t / T} \Rightarrow t = T lo g_{2} 10 = 10 \times 3.32 \approx 33 days$

Hence option (C).

Stream:JEESubject:PhysicsTopic:Modern PhysicsSubtopic:Radioactivity

⏱ 2mℹ️ Source: QB

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