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Beta Decay

A certain rad...

Question

A certain radio active substance has a half life of $5$ years. Thus for a nucleus in a sample of the element, the probability of decay in ten years is

A

50 %

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B

75 %

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C

100 %

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D

60 %

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Solution

The correct option is B $75 %$
In 10 years the number of undecayed particles will be N0/4N0/4. That number of decayed particles will be 3 N0/4N0/4.
Hence probability of decay will be 75%
Option B is right

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