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PhysicsModern PhysicsRadioactivityEasy2 minPYQ_2020

PhysicsEasysingle choice

The half-life of tritium is $12.5$ years. What mass of tritium of initial mass $64 mg$ will remain undecayed after $50$ years?

Options:

Answer:

Solution:

Given, $T_{1 / 2} = 12.5$ years

Initial mass, $N_{0} = 64 mg$

Number of half-lives, $n = \frac{50}{12.5} = 4$

Now, $\frac{N}{N_{0}} = {(\frac{1}{2})}^{n}$

$\Rightarrow \frac{N}{64} = {(\frac{1}{2})}^{4} \Rightarrow N = 64 \times \frac{1}{16} = 4 mg$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Modern PhysicsSubtopic:Radioactivity

⏱ 2mℹ️ Source: PYQ_2020

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