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PhysicsModern PhysicsRadioactivityMedium2 minQB

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If 10% of radioactive substance decays in 10 days, then the amount of the original substance left after 40 days is

Answer:

Solution:

10% decays in 10 days, so each 10-day span leaves a factor 0.9. After 40 days:

$N = N_{0} (0.9)^{4} = 0.656 N_{0} \approx 66%$

Hence option (C).

Stream:JEESubject:PhysicsTopic:Modern PhysicsSubtopic:Radioactivity

⏱ 2mℹ️ Source: QB

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