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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsRadioactivityEasy2 minPYQ_2020

PhysicsEasysingle choice

The half life period of a radioactive substance is $140$ days. After how much time, $15 g$ will decay from a $16 g$ sample of the substance?

Options:

Answer:

Solution:

Ratio of mass remaining undecayed to initial mass is,
$\frac{m}{m_{0}} = {(\frac{1}{2})}^{\frac{t}{T}}$
$\frac{16 - 15}{16} = {(\frac{1}{2})}^{\frac{t}{T}}$
${(\frac{1}{2})}^{4} = {(\frac{1}{2})}^{\frac{t}{T}}$
$\Rightarrow$ $t = 4 T = 4 \times 140$ days
$t = 560$ days

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Modern PhysicsSubtopic:Radioactivity

⏱ 2mℹ️ Source: PYQ_2020

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