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First Order Radioactive Decay

Question

Given a radioactive sample having half - life of 4 days. Find the probability, a nucleus disintegrates after 2 half lives.

A

$$\dfrac 1 {32}$$

B

$$\dfrac {31} {32}$$

C

$$\dfrac{3}{4}$$

D

$$\dfrac 4 5$$

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Solution

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Correct option is A. $$\dfrac{3}{4}$$

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