A radioactive sample decays 75% in 4 hours, then half life of sample is

2 hours

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3 hours

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8/3 hours

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4/3 hours

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Solution

The correct option is A 2 hours
75% decay indicates 25% is left i.e. in 4 hours, 2 half lives have been spent.
$\Rightarrow t_{1 / 2} = 2 hour$

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\frac{3}{4} s

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