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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsRadioactivityMedium2 minQB

PhysicsMediumsingle choice

The count rate of activity of a radioactive sample of a very large population decreased from 1024 to 128 in 3 minutes. Then the rate of disintegration at the end of 5 minutes is

Options:

Answer:

Solution:

1024 $\to$ 128 is 3 halvings in 3 minutes, so $T_{1/2} = 1$ min. At $t = 5$ min (5 half-lives):

$R = \frac{1024}{2 ^{5}} = 32$

Hence option (D).

Stream:JEESubject:PhysicsTopic:Modern PhysicsSubtopic:Radioactivity

⏱ 2mℹ️ Source: QB

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