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PhysicsModern PhysicsRadioactivityMedium2 minQB

PhysicsMediumsingle choice

A radioactive source has a halflife of 20 days. During a period of 60 days fraction of the atoms that have decayed would be

Answer:

Solution:

60 days = 3 half-lives:

$decayed fraction = 1 - (\frac{1}{2})^{3} = \frac{7}{8} = 87.5%$

Hence option (B).

Stream:JEESubject:PhysicsTopic:Modern PhysicsSubtopic:Radioactivity

⏱ 2mℹ️ Source: QB

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