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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsMiscellaneousEasy2 minPYQ_2020

PhysicsEasysingle choice

The activity of a radioactive element decreased to one-third of the original activity $I_{0}$ in a period of nine years. After a further lapse of nine years its activity will be

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Answer:

Solution:

$\frac{I}{I_{0}} = {(\frac{1}{2})}^{\frac{t}{T}}$

$\Rightarrow \frac{1}{3} = {(\frac{1}{2})}^{\frac{9}{T}}$

$\Rightarrow \frac{I'}{I_{0}} = {(\frac{1}{2})}^{\frac{18}{T}} = {\{{(\frac{1}{2})}^{\frac{9}{T}}\}}^{2}$

$\Rightarrow I^{'} = \frac{I_{0}}{9}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Modern PhysicsSubtopic:Miscellaneous

⏱ 2mℹ️ Source: PYQ_2020

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