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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsRadioactivityEasy2 minPYQ_2020

PhysicsEasysingle choice

The half-life of a radioactive substance is $30 \min$ . The time (in minutes) taken between $40 %$ decay and $85 %$ decay of the same radioactive substance is

Options:

Answer:

Solution:

Number of active nuclei falls from 60% to 15%

So the sample becomes $\frac{1}{4} t h$

$= \frac{1}{2^{2}} t h$

So the number of half-lives = 2

Time $t = 2 \times 30 = 60 \min$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Modern PhysicsSubtopic:Radioactivity

⏱ 2mℹ️ Source: PYQ_2020

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