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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsRadioactivityEasy2 minPYQ_2020

PhysicsEasysingle choice

A freshly prepared radioactive source of half-life $2$ hours emits radiation of intensity which is $64$ times the permissible safe level. The minimum time after which it would be possible to work safely with this source is

Options:

Answer:

Solution:

$\frac{N}{N_{0}} = {(\frac{1}{2})}^{\frac{t}{t_{\frac{1}{2}}}}$

$\frac{1}{64} = {(\frac{1}{2})}^{\frac{t}{t_{\frac{1}{2}}}}$

$\frac{t}{t_{\frac{1}{2}}} = 6$

Therefore $t = 6 \times t_{\frac{1}{2}}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Modern PhysicsSubtopic:Radioactivity

⏱ 2mℹ️ Source: PYQ_2020

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