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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsRadioactivityMedium2 minPYQ_2003

PhysicsMediumsingle choice

A sample of radioactive element has a mass of $10 g$ at an instant $t = 0$ . The approximate mass of this element in the sample after two mean lives is:NEET 2003

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Solution:

$N = N_{0} e^{- λ t} \Rightarrow m = m_{0} e^{- λ t} = m_{0} e^{- λ (2/ λ)} = \frac{10}{e ^{2}} = 1.35 gm$

Stream:NEETSubject:PhysicsTopic:Modern PhysicsSubtopic:Radioactivity

⏱ 2mℹ️ Source: PYQ_2003

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