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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsRadioactivityMedium2 minPYQ_2004

PhysicsMediumsingle choice

The half life of a radium is about 1600 years. Of $100 g$ of radium existing now 25 g will remain unchanged after :-NEET 2004

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Answer:

Solution:

Applying the formula $N \Rightarrow \frac{N}{N _{0}} = N_{0} (\frac{1}{2})^{n} = (\frac{1}{2})^{n}$ $\Rightarrow \frac{25}{100} = (\frac{1}{2})^{n} \Rightarrow n = 2$ $∴$ Total time is $2 \times 1600 = 3200$ year

Stream:NEETSubject:PhysicsTopic:Modern PhysicsSubtopic:Radioactivity

⏱ 2mℹ️ Source: PYQ_2004

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