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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 $2 h$ 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

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Answer:

Solution:

From $R = R_{0} {(\frac{1}{2})}^{n}$
we have, $1 = 64 {(\frac{1}{2})}^{n}$

Or number of half lives $= n = 6$

$∴ t = n \times t_{t_{1 / 2}} = 6 \times 2 = 12 h$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Modern PhysicsSubtopic:Radioactivity

⏱ 2mℹ️ Source: PYQ_2020

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